Return-path: X-Andrew-Authenticated-as: 7997;andrew.cmu.edu;Ted Anderson Received: from po9.andrew.cmu.edu via trymail for +dist+/afs/andrew.cmu.edu/usr11/tm2b/space/space.dl@andrew.cmu.edu (->ota+space.digests) ID ; Tue, 4 Dec 90 17:01:02 -0500 (EST) Received: from po9.andrew.cmu.edu via qmail ID ; Tue, 4 Dec 90 05:16:09 -0500 (EST) Received: from po9.andrew.cmu.edu via qmail ID ; Tue, 4 Dec 90 03:18:59 -0500 (EST) Received: from po9.andrew.cmu.edu via qmail ID ; Tue, 4 Dec 90 02:35:31 -0500 (EST) Received: from po5.andrew.cmu.edu via qmail ID ; Tue, 4 Dec 90 01:48:07 -0500 (EST) Received: from beak.andrew.cmu.edu via qmail ID ; Tue, 4 Dec 90 01:40:14 -0500 (EST) Message-ID: <4bKoFTq00VcJ4=lU4n@andrew.cmu.edu> Precedence: junk Reply-To: space+@Andrew.CMU.EDU From: space-request+@Andrew.CMU.EDU To: space+@Andrew.CMU.EDU Date: Tue, 4 Dec 1990 01:38:25 -0500 (EST) Subject: SPACE Digest V12 #620 SPACE Digest Volume 12 : Issue 620 Today's Topics: SOLAR TERRESTRIAL FORECAST AND REVIEW Administrivia: Submissions to the SPACE Digest/sci.space should be mailed to space+@andrew.cmu.edu. Other mail, esp. [un]subscription notices, should be sent to space-request+@andrew.cmu.edu, or, if urgent, to tm2b+@andrew.cmu.edu ---------------------------------------------------------------------- Date: Sun, 2 Dec 90 22:22:23 MST From: std_oler%HG.ULeth.CA@vma.cc.cmu.edu (Cary Oler) Subject: SOLAR TERRESTRIAL FORECAST AND REVIEW X-St-Vmsmail-To: ST%"space+@andrew.cmu.edu" --- SOLAR TERRESTRIAL FORECAST AND REVIEW --- December 01 to December 11, 1990 Report Based In-Part from Data Obtained from the Space Environment Services Center Boulder Colorado -------- SOLAR TERRESTRIAL REVIEW FOR 25 NOVEMBER TO 01 DECEMBER. Solar activity over the past week was low to high. The most significant event was a major class M7.5/1N flare which erupted at 23:17 UT on 26 November. This flare was accompanied by minor radio emissions and was accountable for a low to moderate intensity SID/SWF at 23:12 UT. The flare was located on the extreme western limb (N18W90) within the confines of Region 6368. The duration of the flare was 17 minutes, which is below average for flares of this intensity. No proton enhancements or shock-related frequency sweeps were observed from this energetic event. The flare did not produce any terrestrial impacts aside from the short-duration SID/SWF which accompanied the flare on the sunlit side of the earth. Since 26 November, there have been only two low-level M-class flares, one from Region 6377 (which has now rotated beyond the west limb) and the other from an uncorrelated position on the solar disk. This last M-class event was a long-duration class M1.2 event lasting 1 hour and 23 minutes. Although the source for this flare has not been determined, evidence seems to indicate that it probably originated from new Region 6395, which rotated into view on the eastern limb on 01 December. This region has a relatively large spot area, encompassing a total of 10 sunspots as of 01 December in an FKO type optical configuration. It is a type Beta magnetic group (bipolar) and is not expected to be a very prolific flare producer in its current state. The solar flux reached its apparent minimum value of 157 for this solar rotation on 26 and 27 November. This minimum flux value is the highest minimum to be observed since the rotational minimum of 06 and 07 August, which was followed within two weeks by a pulse of increased solar activity and major flaring. The geomagnetic field was mostly quiet throughout the last week, with the exception of 27 November when a burst of major storming occurred over middle and high latitudes. Boulder reported an associated A-Index value of 35 at 18:00 UT on 27 November, which surpasses all previous middle-latitude magnetic perturbations up to 10 and 11 October, when geomagnetic activity managed to push Boulder's A-index values up to 44. More frequent and intense storming occurred over high latitudes, although the overall geomagnetic activity was relatively short-lived. By 28 November, the magnetic field had returned to predominantly unsettled levels and quickly declined to quiet levels for the remainder of the period. Some periods of auroral storming occurred over high latitudes during the burst of magnetic activity on 27 November. Middle latitudes witnessed increased auroral activity, but no major auroral storming materialized. Low latitudes were unable to spot auroral activity, which remained confined to the high latitude regions. HF radio propagation remained mostly normal throughout the week, with the exception of increased magnetic and auroral activity on 27 November. Significant auroral-induced signal flutter was observed over many middle latitude locations while high latitudes experienced characteristically poor to very poor auroral-degraded propagation conditions. However, HF conditions improved quite rapidly to near normal levels on 28 and 29 November. There were a few flare-related SID/SWF's this week which are suspected of producing degraded HF propagation conditions. However, almost all of the SID's/SWF's which occurred this week were of low intensity and short duration (with the exception of the estimated 1.5 hour low to moderate intensity SID/SWF of 01 December. No significant VHF enhancements were observed from these SID's/SWF's. VHF propagation was near normal this week. There were no known reports of DX contacts made via auroral communications, although there were brief bursts of activity which could have been capable of providing localized VHF backscattering to moderate distances. The rapid stabilization of auroral and geomagnetic activity did not provide very good opportunities for auroral-based DX on VHF. SHORT TERM SOLAR TERRESTRIAL FORECAST Solar activity is expected to remain mostly low over the next week, barring any new major activity centers rotating into view. Region 6395 will continue to provide subflaring and occassional C-class flares. However, this region does not currently appear as though it will be capable of producing many (if any) M-class flares. The next potentially major pulse of activity is expected between 11 and 12 December when old Region 6368 returns. Geomagnetic activity is expected to remain mostly quiet to unsettled this week. There is a risk of unsettled to active periods occurring on or near 05/06 December due to recurrent effects. High latitudes may experience some brief bursts of minor storming with this activity. However, overall, activity is not expected to be particularly strong. Conditions should return to mostly quiet to unsettled levels by 07/08 December. Auroral activity will remain at low to non-visible levels until 05/06 December, when increased solar corpuscular emissions are expected to produce moderate levels of auroral activity at high latitudes. Middle latitudes will likely only witness low levels of auroral activity with possible brief bursts of moderate activity low in the northern horizon near local midnight. Lunar phase will interfere with attempts to view auroral activity this week. The moon, which is at full phase now (on 02 December) will flood out much of any observable auroral activity over low and middle latitudes. High latitudes will be best positioned to view auroral activity after moonrise. However, even there, any auroral activity will appear less distinct and somewhat harder to spot. As the week progresses, moonrise times will allow for some short-periods of moon-free evening-twilight observing periods. HF radio propagation conditions should be mostly normal throughout this week. High latitudes will experience degraded conditions with the onset of expected increased geomagnetic and auroral activity near 05/06 December. Middle latitudes will likely also experience periods of degraded conditions, particularly during the evening/night hours of 05/06 December. Daytime propagation over middle latitudes should be normal throughout the week. Low latitudes should maintain normal propagation conditions all through the week provided signal paths avoid the northerly-middle and high latitude regions during the evening/midnight and early morning hours. VHF conditions should remain normal this week. No significant opportunities for DX are expected this week. The only possible exception to this would be on 05/06 November when increased auroral activity may allow for some limited localized and sporadic auroral backscatter propagation on VHF. However, activity is not expected to be intense enough to provide widespread backscattering from most high and almost all middle latitude stations. SUMMARY OF ALL ACTIVE REGIONS VISIBLE ON THE SOLAR DISK AS OF 02 DECEMBER Region # Location LO Area Class LL Spots Magnetic Type -------- -------- --- ---- ----- -- ----- ------------- 6379 S06W35 263 0060 CRO 07 006 BETA 6381 S04W18 246 0060 HRX 01 001 ALPHA 6382 S20W04 232 0180 HSX 02 001 ALPHA 6383 N15E05 223 0270 CSO 05 009 BETA 6384 N12W29 257 0000 AXX 01 002 ALPHA 6385 S16E18 210 0240 HSX 02 002 ALPHA 6387 S24E35 193 0450 CSO 08 006 BETA 6388 S07W10 238 0030 CRO 04 004 BETA 6390 N35E48 180 0420 DSO 09 003 BETA 6391 N10E25 203 0060 CRO 06 006 BETA 6392 S26W39 267 0030 BXO 06 002 BETA 6393 S20E14 214 0030 HRX 01 001 ALPHA 6394 N05W59 287 0030 BXO 04 003 BETA 6395 N16E73 155 1080 FKO 16 010 BETA 6396 S22W34 262 0030 BXO 03 005 BETA NOTES: Area is in million square kilometers. Angular extent (LL) and solar longitude (LO) are in degree's. For more information regarding the terminology used above, request the Glossary of Solar Terrestrial Terms from: "std_oler@hg.uleth.ca". H-ALPHA PLAGES WITHOUT SPOTS. LOCATIONS VALID AS OF 24:00 UT ON 01 DECEMBER. REGION LOCATION LO COMMENTS (IF ANY) ------ -------- --- ------------------------------- 6389 N02W26 254 ACTIVE REGIONS DUE TO RETURN BETWEEN 02 AND 04 DECEMBER Region Latitude Longitude (Helio.) ------ -------- --------- 6366 S21 101 6364 S30 129 6361 N08 131 NOTES: For definitions regarding the above, request the "Glossary of Solar Terrestrial Terms" from "std_oler@hg.uleth.ca". GRAPHICAL ANALYSIS OF RECENT GEOMAGNETIC ACTIVITY - BOULDER COLORADO Cumulative Geomagnetic Activity History Peak Geomagnetic Activity during the past 87 hours _________________________________________________________________ | EXTREMELY SEVERE | | | | | VERY HIGH! | | VERY SEVERE STORM | | | | | HIGH | | SEVERE STORM | | | | | MODERATE | | MAJOR STORM | | | | | MODERATE | | MINOR STORM | | | | | LOW | | VERY ACTIVE | | | | | NONE - LOW | | ACTIVE | | * | | | NONE | | UNSETTLED |* ***| * *****|** * | **| NONE | | QUIET |** *****|********|********| ***| NONE | | VERY QUIET |********|********|********|*****| NONE | |-------------------|--------|--------|--------|-----|------------| | Geomagnetic Field | Thu. | Fri. | Sat. | Sun.| Anomaly | | Conditions | Given in 3-hour intervals | Intensity | |_________________________________________________________________| NOTES: This graph ONLY depicts geomagnetic conditions observed at Boulder, Colorado for the past 87 hours. Conditions to the north of Boulder will generally have slightly higher activity than Boulder, while conditions to the south of Boulder will likely have lower activity than those depicted here. However, the plots should present a good approximate average of planetary geomagnetic conditions. For information regarding the interpretation and/or use of these charts, send a request for the document "Understanding Solar Terrestrial Reports" to: std_oler@hg.uleth.ca. This document is still being prepared and is not yet available. PLANETARY 10-DAY GEOMAGNETIC ACTIVITY OUTLOOK (02 DECEMBER - 11 DECEMBER) ________________________________________________________________________ | EXTREMELY SEVERE | | | | | | | | | | | VERY HIGH! | | VERY SEVERE STORM | | | | | | | | | | | HIGH | | SEVERE STORM | | | | | | | | | | | MODERATE | | MAJOR STORM | | | | | | | | | | | MODERATE | | MINOR STORM | | | | | | | | | | | LOW | | VERY ACTIVE | | | | | | | | | | | NONE - LOW | | ACTIVE | | | | | * | | | | | | NONE | | UNSETTLED | | | * |***|***|** | * | * | | | NONE | | QUIET |***|***|***|***|***|***|***|***|***|***| NONE | | VERY QUIET |***|***|***|***|***|***|***|***|***|***| NONE | |-------------------|---|---|---|---|---|---|---|---|---|---|------------| | Geomagnetic Field |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| Anomaly | | Conditions | Given in 8-hour intervals | Intensity | |________________________________________________________________________| NOTES: Predicted geomagnetic activity is based heavily on recurrent phenomena. Transient energetic solar events cannot be predicted reliably over periods in excess of several days. Hence, there may be some deviations from the predictions due to the unpredictable transient solar component. GRAPHICAL ANALYSIS OF SOLAR ACTIVITY OVER THE PAST 60 DAYS Cumulative Graphical Analysis of Solar Activity ____________________________________________________________ 242| | MOD. 235| F = Major Flare(s) | MOD. 227| * | MOD. 220| *** * * | MOD. 212| *** * ** * * | MOD. 205| **** * ** *** | MOD. 197| ****** *F **** * ***** | MOD. 190| **********F ******* ******* | LOW 182|* ***********F* **************** *| LOW 175|* ************F* ****************** **| LOW 167|****************F** ********************* * ***| LOW 160|****************F*** * * ********************* *****| LOW 152|****************F********** **********************F******| LOW 145|****************F********** * ***********************F******| LOW 137|****************F************************************F******| LOW 130|****************F************************************F******| LOW ------------------------------------------------------------ Cumulative 60 day Solar Activity Record Start Date: October 4, 1990 NOTES: Left-hand column digits represent the 10.7 cm solar radio flux obtained from Ottawa. The right-hand column describes the relative solar activity for that period based on the average number of major and minor flares that can be expected for related solar flux values. Plot lines labeled with the letter "F" represent days where at least one major flare occurred (ie. class M5 or greater flare). GRAPHICAL 20-DAY SOLAR ACTIVITY PREDICTION Solar Activity _________________________________________________________________ | 230 | | | | | | | | | | | | | | | | | | | | | | 224 | | | | | | | | | | | | |**|**| | | | | | | | 218 | | | | | | | | | | | |**| | |**| | | | | | | 212 | | | | | | | | | | |**| | | | |**| | | | | | 206 | | | | |**|**| | | | | | | | | | |**| | | | | 200 | | | |**| | |**| | |**| | | | | | | |**| | | | 194 | | |**| | | | |**|**| | | | | | | | | | | | | 188 | |**| | | | | | | | | | | | | | | | |**| | | 182 |**| | | | | | | | | | | | | | | | | | |**| | 176 | | | | | | | | | | | | | | | | | | | | | | 170 | | | | | | | | | | | | | | | | | | | | | | 164 | | | | | | | | | | | | | | | | | | | | | | 158 | | | | | | | | | | | | | | | | | | | | | | 152 | | | | | | | | | | | | | | | | | | | | | | 146 | | | | | | | | | | | | | | | | | | | | | | 140 | | | | | | | | | | | | | | | | | | | | | |-----|--|--|--|--|--|--|--|--|--|--|--|--|--|--|--|--|--|--|--|--| |Solar|02|03|04|05|06|07|08|09|10|11|12|13|14|15|16|17|18|19|20|21| |Flux | December | ----------------------------------------------------------------- HF RADIO SIGNAL PROPAGATION PREDICTIONS (02 DECEMBER - 11 DECEMBER) High Latitude Paths ________________________________________________________ | EXTREMELY GOOD | | | | | | | | | | | | VERY GOOD | | | | | | | | | | | | GOOD | *| *| | | | | | | |* *| | FAIR |** |** |***|* *| *|* *|* *|* *|***| * | | POOR | | | | * |** | * | * | * | | | | VERY POOR | | | | | | | | | | | | EXTREMELY POOR | | | | | | | | | | | |----------------|---|---|---|---|---|---|---|---|---|---| | PROPAGATION |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| | QUALITY | Given in 8-Hour UT Intervals | -------------------------------------------------------- Middle Latitude Paths ________________________________________________________ | EXTREMELY GOOD | | | | | | | | | | | | VERY GOOD |* *|* *|* *| | | *|* *|* *|* *|* *| | GOOD | * | * | * |* *| *|** | * | * | * | * | | FAIR | | | | * |** | | | | | | | POOR | | | | | | | | | | | | VERY POOR | | | | | | | | | | | | EXTREMELY POOR | | | | | | | | | | | |----------------|---|---|---|---|---|---|---|---|---|---| | PROPAGATION |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| | QUALITY | Given in 8-Hour UT Intervals | -------------------------------------------------------- Low Latitude Paths ________________________________________________________ | EXTREMELY GOOD | | | | | | | | | | | | VERY GOOD |***|***|***|* *| *|* *|***|***|***|***| | GOOD | | | | * |** | * | | | | | | FAIR | | | | | | | | | | | | POOR | | | | | | | | | | | | VERY POOR | | | | | | | | | | | | EXTREMELY POOR | | | | | | | | | | | |----------------|---|---|---|---|---|---|---|---|---|---| | PROPAGATION |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| | QUALITY | Given in 8-Hour UT Intervals | -------------------------------------------------------- NOTES: High latitudes >= 55 degree's north latitude Middle latitudes >= 40 < 55 degree's north latitude Low latitudes < 40 degree's north latitude POTENTIAL VHF DX PROPAGATION PREDICTIONS (02 DECEMBER - 11 DECEMBER) INCLUDES SID AND AURORAL BACKSCATTER ENHANCEMENT PREDICTIONS HIGH LATITUDES __________________________________________________ ___________________ | SIGNAL | Given in 8 hour local time intervals | | SID ENHANCEMENT | | QUALITY |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| |S|M|T|W|T|F|S|S|M|T| |__________|___|___|___|___|___|___|___|___|___|___| |-|-|-|-|-|-|-|-|-|-| | VERY GOOD| | | | | | | | | | | 0%|*|*|*|*|*|*|*|*|*|*| |ABOVE NORM| | | | | | | | | | | 20%| | | | | | | | | |*| | NORMAL|***|***|***| **| **|***|***|***|***|***| 40%| | | | | | | | | | | |BELOW NORM| | | |* |* | | | | | | 60%| | | | | | | | | | | | VERY POOR| | | | | | | | | | | 80%| | | | | | | | | | | | BLACKOUT| | | | | | | | | | |100%| | | | | | | | | | | |==========|===|===|===|===|===|===|===|===|===|===| |-------------------| | 100% | | | | | | | | | | |100%| | | | | | | | | | | | 80% | | | | | | | | | | | 80%| | | | | | | | | | | | 60% | | | | | | | | | | | 60%| | | | | | | | | | | | 40% | | | | *|* *| | | | | | 40%| | | | |*| | | | | | | 20% |* *|* *|* *|***|***|***|* *|* *|* *|* *| 20%| | |*|*|*|*| |*|*| | | 0% |***|***|***|***|***|***|***|***|***|***| 0%|*|*|*|*|*|*|*|*|*|*| |----------+---|---|---|---|---|---|---|---|---|---| |-|-|-|-|-|-|-|-|-|-| |CHANCE OF |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| |S|M|T|W|T|F|S|S|M|T| | VHF DX | Given in 8 hour local time intervals | |AURORAL BACKSCATTER| |__________|_______________________________________| |___________________| MIDDLE LATITUDES __________________________________________________ ___________________ | SIGNAL | Given in 8 hour local time intervals | | SID ENHANCEMENT | | QUALITY |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| |S|M|T|W|T|F|S|S|M|T| |__________|___|___|___|___|___|___|___|___|___|___| |-|-|-|-|-|-|-|-|-|-| | VERY GOOD| | | | | | | | | | | 0%|*|*|*|*|*|*|*|*|*|*| |ABOVE NORM| | | | | | | | | | | 20%| | | |*|*|*|*|*|*|*| | NORMAL|***|***|***|***|***|***|***|***|***|***| 40%| | | | | | | | | |*| |BELOW NORM| | | | | | | | | | | 60%| | | | | | | | | | | | VERY POOR| | | | | | | | | | | 80%| | | | | | | | | | | | BLACKOUT| | | | | | | | | | |100%| | | | | | | | | | | |==========|===|===|===|===|===|===|===|===|===|===| |-------------------| | 100% | | | | | | | | | | |100%| | | | | | | | | | | | 80% | | | | | | | | | | | 80%| | | | | | | | | | | | 60% | | | | | | | | | | | 60%| | | | | | | | | | | | 40% | | | | | | | | | | | 40%| | | | | | | | | | | | 20% | | | |* *|* *| | | | * | * | 20%| | | |*|*| | | | | | | 0% |***|***|***|***|***|***|***|***|***|***| 0%|*|*|*|*|*|*|*|*|*|*| |----------+---|---|---|---|---|---|---|---|---|---| |-|-|-|-|-|-|-|-|-|-| |CHANCE OF |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| |S|M|T|W|T|F|S|S|M|T| | VHF DX | Given in 8 hour local time intervals | |AURORAL BACKSCATTER| |__________|_______________________________________| |___________________| LOW LATITUDES __________________________________________________ ___________________ | SIGNAL | Given in 8 hour local time intervals | | SID ENHANCEMENT | | QUALITY |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| |S|M|T|W|T|F|S|S|M|T| |__________|___|___|___|___|___|___|___|___|___|___| |-|-|-|-|-|-|-|-|-|-| | VERY GOOD| | | | | | | | | | | 0%|*|*|*|*|*|*|*|*|*|*| |ABOVE NORM| | | | | | | | | | | 20%| | | |*|*|*|*|*|*|*| | NORMAL|***|***|***|***|***|***|***|***|***|***| 40%| | | | | | | | | |*| |BELOW NORM| | | | | | | | | | | 60%| | | | | | | | | | | | VERY POOR| | | | | | | | | | | 80%| | | | | | | | | | | | BLACKOUT| | | | | | | | | | |100%| | | | | | | | | | | |==========|===|===|===|===|===|===|===|===|===|===| |-------------------| | 100% | | | | | | | | | | |100%| | | | | | | | | | | | 80% | | | | | | | | | | | 80%| | | | | | | | | | | | 60% | | | | | | | | | | | 60%| | | | | | | | | | | | 40% | | | | | | | | | | | 40%| | | | | | | | | | | | 20% | | | | * | * | * | * | * | * | * | 20%| | | | | | | | | | | | 0% |***|***|***|***|***|***|***|***|***|***| 0%|*|*|*|*|*|*|*|*|*|*| |----------+---|---|---|---|---|---|---|---|---|---| |-|-|-|-|-|-|-|-|-|-| |CHANCE OF |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| |S|M|T|W|T|F|S|S|M|T| | VHF DX | Given in 8 hour local time intervals | |AURORAL BACKSCATTER| |__________|_______________________________________| |___________________| NOTES: These VHF DX prediction charts are defined for the 50 MHz to 220 MHz bands. They are based primarily on phenomena which can affect VHF DX propagation globally. They should be used only as a guide to potential DX conditions on VHF bands. Latitudinal boundaries are the same as those for the HF predictions charts. For more information, request the document "Understanding Solar Terrestrial Reports" from: "std_oler@hg.uleth.ca". This document is still being prepared and is not yet available. AURORAL ACTIVITY PREDICTIONS (02 DECEMBER - 11 DECEMBER) High Latitude Locations ________________________________________________________ | EXTREMELY HIGH | | | | | | | | | | | | VERY HIGH | | | | | | | | | | | | HIGH | | | | | | | | | | | | MODERATE | | | | * | * | | | | | | | LOW | | |***|***|***|***|***|***| * | | | NOT VISIBLE |***|***|***|***|***|***|***|***|***|***| |----------------|---|---|---|---|---|---|---|---|---|---| | AURORAL |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| | INTENSITY | Eve.Twilight/Midnight/Morn.Twilight | -------------------------------------------------------- Middle Latitude Locations ________________________________________________________ | EXTREMELY HIGH | | | | | | | | | | | | VERY HIGH | | | | | | | | | | | | HIGH | | | | | | | | | | | | MODERATE | | | | | | | | | | | | LOW | | | | * |***| * | | | | | | NOT VISIBLE |***|***|***|***|***|***|***|***|***|***| |----------------|---|---|---|---|---|---|---|---|---|---| | AURORAL |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| | INTENSITY | Eve.Twilight/Midnight/Morn.Twilight | -------------------------------------------------------- Low Latitude Locations ________________________________________________________ | EXTREMELY HIGH | | | | | | | | | | | | VERY HIGH | | | | | | | | | | | | HIGH | | | | | | | | | | | | MODERATE | | | | | | | | | | | | LOW | | | | | | | | | | | | NOT VISIBLE |***|***|***|***|***|***|***|***|***|***| |----------------|---|---|---|---|---|---|---|---|---|---| | AURORAL |Sun|Mon|Tue|Wed|Thu|Fri|Sat|Sun|Mon|Tue| | INTENSITY | Eve.Twilight/Midnight/Morn.Twilight | -------------------------------------------------------- NOTE: For more information regarding these charts, send a request for the document, "Understanding Solar Terrestrial Reports" to: std_oler@hg.uleth.ca. This document is currently being prepared and is not yet available. ** End of Report ** ------------------------------ End of SPACE Digest V12 #620 *******************