home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Shareware Overload
/
ShartewareOverload.cdr
/
database
/
bcast100.zip
/
SGDBS.ZIP
/
91-11-09.DLY
< prev
next >
Wrap
Text File
|
1991-11-09
|
6KB
|
106 lines
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
DAILY SUMMARY OF SOLAR GEOPHYSICAL ACTIVITY
09 NOVEMBER, 1991
/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\/\
(Based In-Part On SESC Observational Data)
SOLAR AND GEOPHYSICAL ACTIVITY INDICES FOR 09 NOVEMBER
------------------------------------------------------
NOTE: It appears as though the P1 channel on the GOES spacecraft is still
unreliable. Problems reappeared earlier this UT day which have once again
invalidated the proton fluence value at greater than 1 MeV. Proton fluence
values may be sporadically valid and should be considered suspicious if
given, until otherwise noted. Greater than 10 MeV fluence values are valid.
!!BEGIN!! (1.0) S.T.D. Solar Geophysical Data Broadcast for DAY 313, 11/09/91
10.7 FLUX=197.4 90-AVG=200 SSN=205 BKI=8866 5553 BAI=100
BGND-XRAY=C1.2 FLU1=*.*E*** FLU10=7.2E+03 PKI=7776 5453 PAI=084
BOU-DEV=371,386,199,164,106,094,072,024 DEV-AVG=177 NT SWF=03:061
XRAY-MAX= X1.1 @ 1544UT XRAY-MIN= B9.8 @ 0204UT XRAY-AVG= C3.5
NEUTN-MAX= +001% @ 1255UT NEUTN-MIN= -007% @ 0405UT NEUTN-AVG= -2.1%
PCA-MAX= +0.4DB @ 0120UT PCA-MIN= -0.2DB @ 2355UT PCA-AVG= -0.1DB
BOUTF-MAX=55739NT @ 0016UT BOUTF-MIN=55133NT @ 0423UT BOUTF-AVG=55288NT
GOES7-MAX=E:+186NT@ 0347UT GOES7-MIN=N:-052NT@ 0046UT G7-AVG=+072,+067,+004
GOES6-MAX=P:+136NT@ 0055UT GOES6-MIN=P:-171NT@ 0001UT G6-AVG=+075,-008,+008
FLUXFCST=STD:200,200,190;SESC:195,195,185 BAI/PAI-FCST=026,022,027/030,025,025
KFCST=5554 4333 3333 3455 27DAY-AP=008,007 27DAY-KP=1112 3322 2112 2221
WARNINGS=*MAJFLR;*PROTFLR;*PROTON;*PCA;*GSTRM;*AURMIDWCH
ALERTS=**MAJFLR:X1.1/1B,S16W57(6906),1531-1544-1618,II:1@1542,IV:1;
**TENFLR:540SFU@1533;**MINFLR:M1.5@0320;**MINFLR:M1.4@2055;
**245STRM:0241-0631;**SEVSTRM
!!END-DATA!!
BRIEF SUMMARY OF EVENTS
-----------------------
Solar activity was high today. Region 6906 (S16W67) produced a class
X1.1/1B tenflare with parallel ribbons at 15:44 UT. The tenflare was
measured at 540 sfu and lasted 17 minutes. This event was accompanied by
weak Types II and IV sweeps. Region 6906 became somewhat larger today when
the only remaining spot from old Region 6914 merged with the trailer spots of
Region 6906. This cluster of spots is now considered part of Region 6906.
Other than this, Region 6906 experienced no growth of its own.
Region 6918 (N22W08) produced an M1.5/SN flare at 03:20 UT and then
proceeded to decay for the remainder of the day. Region 6915 (N20E17)
managed to spawn four C-class flares as it experienced rapid growth. It is
continuing to grow rapidly at the present time. Region 6919 (S12E61), the
site of the most recent class M6.9/1N flare at 01:35 UT on 10 November, also
experienced some growth (see the Major Flare Alert or tommorrows daily
summary for additional details of this major flare).
A single new region was numbered today: Region 6920 is located at
S20W31 and is presently a simple bipolar region.
Solar activity will be high on 10 November. The most recent class
M6.9/1N flare from Region 6919 guarantees this. Minor M-class flares and
another possible major flare from Region 6906 may occur over the next 24 to
72 hours. The potential for protons associated with major flaring remains
a threat until Region 6906 crosses the west limb in a few more days.
The geomagnetic field was significantly disturbed today. Severe
geomagnetic storming was observed until approximately 09:00 UT on 09
November. Thereafter, mostly minor to major storm level perturbations were
observed, while high latitude regions continued to experience major to severe
storming. Activity has been stabilizing rather rapidly over the last six
hours. Mostly active conditions are anticipated for 10 November. Todays
major class X1.1/1B tenflare may have a minor impact late on 11 November or
early on 12 November. Nothing significant is anticipated.
Auroral storming today has been more intense than anything observed
since late March of this year. Significant levels of auroral activity were
observed in both the northern and southern hemispheres, particularly over
North America. Reports of auroral observations as far south as Lubbock,
Texas were received (preliminary). Conditions have since stabilized.
Auroral activity should remain confined to the high and northerly middle
latitude regions on 10 November.
HF propagation conditions were severely degraded over all regions on 10
November. Polar to middle latitudes experienced blackout to near blackout
propagation conditions. Low latitudes observed fair to very poor propagation
conditions. Some minor improvements were noted later this UT day,
particularly over the low and middle latitudes. Improvements should continue
over all latitudes on 10 November, although a full return to normal
propagation conditions is not expected for at least the next 4 to 6 days.
Recent major flaring is expected to prolong active levels of geomagnetic
activity, thereby slowing the recovery phase of the ionosphere.
Widespread observations of strong to very strong bistatic VHF auroral
backscatter has been received throughout the world, including Europe, North
America, Australia and New Zealand. Conditions were superb for VHF
backscatter conditions near and above 144 MHz during the late afternoon and
early evening hours of 08/09 November. Conditions have now stabilized
sufficiently to prevent widespread VHF backscatter communications. No
further significant opportunities are anticipated into the near future,
barring influential major flaring.
** End of Daily Update **