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1991-06-28
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X-Andrew-Authenticated-as: 7997;andrew.cmu.edu;Ted Anderson
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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
*******************