Return-path: X-Andrew-Authenticated-as: 7997;andrew.cmu.edu;Ted Anderson Received: from beak.andrew.cmu.edu via trymail for +dist+/afs/andrew.cmu.edu/usr11/tm2b/space/space.dl@andrew.cmu.edu (->+dist+/afs/andrew.cmu.edu/usr11/tm2b/space/space.dl) (->ota+space.digests) ID ; Mon, 17 Dec 1990 15:10:50 -0500 (EST) Message-ID: Precedence: junk Reply-To: space+@Andrew.CMU.EDU From: space-request+@Andrew.CMU.EDU To: space+@Andrew.CMU.EDU Date: Mon, 17 Dec 1990 15:10:14 -0500 (EST) Subject: SPACE Digest V12 #675 SPACE Digest Volume 12 : Issue 675 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: Mon, 10 Dec 90 01:00:02 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" /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ Please Note: The document "Understanding Solar Terrestrial Reports" will be ready for distribution this week. The document will be posted over the various nets in several parts. Hopefully, those of you who requested the report will receive the full document over the nets. This route has been chosen because of the overwhelming number of requests which have been received for this document. If any of you fail to receive the document within the next two weeks, feel free to request it directly from std_oler@hg.uleth.ca. /\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\ --- SOLAR TERRESTRIAL FORECAST AND REVIEW --- December 09 to December 18, 1990 Report Based In-Part from Data Obtained from the Space Environment Services Center Boulder Colorado -------- SOLAR TERRESTRIAL REVIEW FOR 02 DECEMBER TO 08 DECEMBER. Solar activity this week again ranged from low to high. The most significant event was the major class M6.6/1F flare of 04 December which originated from Region 6397. This region was unusually active early in the week. It unexpectedly produced this major flare when magnetic gradients within the region were observed as being relatively weak. It was also responsible for several M-class events and numerous C-class flares. The major flare of 04 December occurred at 02:03 UT and lasted a respectable 39 minutes. It had no terrestrial impacts, due to its distant location (N08E56), lack of emissions and absence of sweep frequency events. The solar flux continued a steady climb this week with the return of numerous regions. At the present time (09 December), there are 15 active regions on the sun, four of which are showing signs of increased spot growth and flaring. Region 6397, which produced the major flare earlier in the week, stabilized during the week and is now beginning to show increased signs of instability. At 09:28 UT on 09 December, this region produced a class M1.0/1F impulsive flare at a location of N09W11. This region is also exhibiting signs of increased magnetic complexity, although it is still rated as a bipolar beta-type spot group. Aside from Region 6397, the only other region to produce any significant minor flaring was Region 6410, which spawned a class M2.8/1N flare at 08:21 UT. This flare borders as a long-duration event, maintaining energy output for 65 minutes. However, it's location (N02E79) will prevent it from having any geophysical impacts on the earth. This flare is suspected of producing a moderate-duration, moderate-intensity SID/SWF. However, this has not yet been confirmed. The background X-ray flux, which is (among other things) an indicator of the intensity of solar activity, has increased over the week with the appearance of the numerous new solar regions. It is currently holding at an X-ray level of C1.5. Geomagnetic and auroral activity this week was notably low. The only exception to this was on 04 December when geomagnetic activity increased to unsettled levels over most latitudes. High latitudes experienced a few brief periods of minor storming. But other than that, activity remained relatively low. Auroral activity was visible over high latitudes and northerly middle latitudes on the evening of 04 December, but returned to generally non-visible levels for the remainder of the week. HF radio propagation conditions were normal to above normal this week, due in part to increased ionospheric ionization and low geomagnetic activity. MUF's experienced a respectable increase over the last week and are now approaching (and exceeding over some paths) 50 MHz. VHF propagation has been good this week, with increased prospects for DX on the lower-frequency VHF bands (ie. near 50 MHz). There have been no significant opportunities for auroral communications this week, however several SID's (particularly the one accompanying the major flare of 04 December) were capable of enhancing VHF propagation over the sunlit portions of the earth. SHORT TERM SOLAR TERRESTRIAL FORECAST Solar activity is expected to reach its peak during this week. The solar flux is expected to peak somewhere near 245-250. The sunspot number (currently 288) could break 300 before the week ends. Old Region 6368, which contained a complex beta-gamma-delta magnetic configuration, is due to return between 11 December and 12 December. This region was extensive in area, but exhibited signs of decay and stabilization before it passed out of view several weeks ago. Models currently suggest that this region has probably detensified and returned to a relatively stable, less extensive and less threatening configuration. Remnants of this region should rotate back into view between 11 and 12 December, which should produce a notable increase in the solar flux. There is a slight possibility that old Region 6368 has maintained its extensive size and magnetic complexity. Should this be true, flare activity could increase further over the coming week. This is, however, going against what most of the models suggest. Geomagnetic activity is expected to remain mostly quiet until later in the week, near 15 or 16 December, when activity is expected to increase to mostly unsettled levels. By near 19 December, activity should again return to quiet levels. Auroral activity should likewise increase near 16 December, peaking near 17 December. Periods of moderate activity are likely over high latitudes during this time. Middle latitudes will likely only witness periods of low activity on these dates, with a risk of sporadic moderate activity. HF radio propagation conditions should be above normal this week, with significant possibilities for DX existing until near 15 December when decreased ionization and increased geomagnetic activity will hamper attempts at DX over many latitudes. There is a risk for brief flare-related short- wave-fades (SWF's) this week, due to the number of M-class flare-capable regions existing on the solar disk. The frequency of SWF's may increase if old Region 6368 returns with a complex configuration. Overall, this week looks like one of the better opportunities for HF DX. VHF propagation conditions should be normal to above normal this week. The prospects for VHF DX are increased, particularly for those who work the lower VHF bands near 50 MHz. Daily MUF's are approaching 50 MHz at the present time and may be exceeding 50 MHz over some paths, providing potential openings on frequencies at and above 50 MHz. There is also a moderate possibility for flare-related VHF enhancements which might permit isolated periods of VHF DX. SUMMARY OF ALL ACTIVE REGIONS VISIBLE ON THE SOLAR DISK AS OF 10 DECEMBER Region # Location LO Area Class LL Spots Magnetic Type -------- -------- --- ---- ----- -- ----- ------------- 6385 S15W86 208 0090 HSX 01 001 ALPHA 6387 S25W67 189 0720 DAI 10 017 BETA 6390 N35W54 176 0030 BXO 03 002 BETA 6395 N18W26 148 0660 DAI 10 031 BETA 6397 N10W21 143 1020 DKO 10 023 BETA 6398 N14W43 165 0570 DAO 10 018 BETA 6399 N22W40 162 0000 AXX 00 001 ALPHA 6402 S11W53 175 0240 DAO 10 015 BETA 6404 S18W14 136 0450 DAO 09 011 BETA 6406 S27E18 104 0030 BXO 05 004 BETA 6407 S15W74 196 0240 CSO 09 005 BETA 6408 N25E45 077 0030 BXO 04 002 BETA 6409 N28E65 057 0210 HAX 01 001 ALPHA 6410 N05E71 051 0720 DAO 07 006 BETA 6411 S24E61 061 0000 AXX 00 001 ALPHA 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 09 DECEMBER. REGION LOCATION LO COMMENTS (IF ANY) ------ -------- --- ------------------------------- 6401 S33W76 198 6403 S23W47 169 NONE 6405 S11E17 105 ACTIVE REGIONS DUE TO RETURN BETWEEN 10 AND 12 DECEMBER Region Latitude Longitude (Helio.) ------ -------- --------- 6368 N18 025 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. PLANETARY 10-DAY GEOMAGNETIC ACTIVITY OUTLOOK (09 DECEMBER - 18 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 ____________________________________________________________ 245| | MOD. 237| F = Major Flare(s) | MOD. 230| * **| MOD. 222| ** * ****| MOD. 214| *** * * * *****| MOD. 207| **** * ** *** *****| MOD. 199|****** *F *** ***** F*****| MOD. 191|*********F ******* ****** *F*****| MOD. 184|*********F* *************** *F*****| LOW 176|*********F* ****************** ***F*****| LOW 168|*********F** ******************** * ****F*****| LOW 161|*********F*** * * ********************* ******F*****| LOW 153|*********F******* ** **********************F*******F*****| LOW 145|*********F********** * ***********************F*******F*****| LOW 138|*********F************************************F*******F*****| LOW ------------------------------------------------------------ Cumulative 60 day Solar Activity Record Start Date: October 11, 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 _________________________________________________________________ | 250 | | | | | | | | | | | | | | | | | | | | | | 243 | | |**|**| | | | | | | | | | | | | | | | | | 236 |**|**| | |**| | | | | | | | | | | | | | | | | 229 | | | | | |**| | | | | | | | | | | | | | | | 223 | | | | | | |**|**| | | | | | | | | | | | | | 216 | | | | | | | | |**|**| | | | | | | | | | | | 209 | | | | | | | | | | |**| | | | | | | | | | | 202 | | | | | | | | | | | |**| | | | | | | | | | 195 | | | | | | | | | | | | |**| | | | | | | | | 188 | | | | | | | | | | | | | |**| | | | | | | | 181 | | | | | | | | | | | | | | |**| | | | | | | 174 | | | | | | | | | | | | | | | | | | | | | | 168 | | | | | | | | | | | | | | | |**| | | | | | 161 | | | | | | | | | | | | | | | | |**| | |**| | 154 | | | | | | | | | | | | | | | | | |**|**| | | 146 | | | | | | | | | | | | | | | | | | | | | |-----|--|--|--|--|--|--|--|--|--|--|--|--|--|--|--|--|--|--|--|--| |Solar|09|10|11|12|13|14|15|16|17|18|19|20|21|22|23|24|25|26|27|28| |Flux | December | ----------------------------------------------------------------- HF RADIO SIGNAL PROPAGATION PREDICTIONS (09 DECEMBER - 18 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 (09 DECEMBER - 18 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". AURORAL ACTIVITY PREDICTIONS (09 DECEMBER - 18 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. ** End of Report ** ------------------------------ End of SPACE Digest V12 #675 *******************