Viewing archive of Friday, 11 September 1998

Solar activity report

Report of Solar-Geophysical Activity 1998 Sep 11 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 254 Issued at 2200Z on 11 SEP 1998

IA. Analysis of Solar Active Regions and Activity from 10-2100Z to 11-2100Z

SOLAR ACTIVITY WAS MODERATE. REGION 8333 (N12W55) GENERATED A M2/1B X-RAY EVENT AT 11/1603Z, WHICH WAS PRECEEDED BY TWO EARLIER C1/SF EVENTS, AND FOLLOWED BY A C2/SF EVENT. THE M2 FLARE OCCURRED OVER SEVERAL ERUPTIVE CENTERS, AND HAD AN ASSOCIATED HIGH SPEED BSD (BRIGHT SURGE ON THE DISK). A SMALL ARCH FILAMENT SYSTEM IS CURRENTLY IN PLACE OVER THE NORTH PORTION OF THE REGION. REGION 8333 IS CLASSIFIED AS A 9-SPOT 'CSO' BETA GROUP. ONE NEW SMALL B-TYPE REGION WAS NUMBERED TODAY, 8334 AT S25W35.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW, WITH THE CHANCE FOR ANOTHER ISOLATED M-CLASS EVENT FROM REGION 8333. IIA. GEOPHYSICAL ACTIVITY SUMMARY FROM 10/2100Z TO 11/2100Z: THE GEOMAGNETIC FIELD HAS BEEN QUIET AT ALL LATITUDES FOR THE PAST 24 HOURS. THE GREATER THAN 2 MEV ELECTRON FLUX WAS IN THE MODERATE TO HIGH RANGE.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO BE MOSTLY QUIET, WITH ISOLATED PERIODS OF UNSETTLED CONDITIONS, FOR THE NEXT THREE DAYS.
III. Event Probabilities 12 SEP to 14 SEP
Class M20%15%10%
Class X01%01%01%
Proton01%01%01%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       11 SEP 139
  Predicted   12 SEP-14 SEP  135/130/125
  90 Day Mean        11 SEP 125
V. Geomagnetic A Indices
OBSERVED AFR/AP 10 SEP  005/005
ESTIMATED AFR/AP 11 SEP  005/005
PREDICTED AFR/AP 12 SEP-14 SEP  010/009-010/009-005/009
VI. Geomagnetic Activity Probabilities 12 SEP to 14 SEP
A. Middle Latitudes
Active15%15%15%
Minor storm10%05%05%
Major-severe storm01%01%01%
B. High Latitudes
Active15%15%15%
Minor storm10%05%05%
Major-severe storm01%01%01%

<< Go to daily overview page

Latest news

Support SpaceWeatherLive.com!

A lot of people come to SpaceWeatherLive to follow the Sun's activity or if there is aurora to be seen, but with more traffic comes higher server costs. Consider a donation if you enjoy SpaceWeatherLive so we can keep the website online!

100%

Latest alerts

Get instant alerts!

Space weather facts

Last X-flare:2017/09/10X8.2
Last M-flare:2017/10/20M1.0
Last geomagnetic storm:2019/09/28Kp5 (G1)
Number of spotless days in 2019:218
Current stretch spotless days:20

This day in history*

Solar flares
12014X1.6
22001X1.2
32003M9.9
42014M8.7
52001M6.7
ApG
1200196G3
2199991G4
3199638G3
4200334G1
5199425G2
*since 1994

Social networks