Viewing archive of Thursday, 24 September 1998

Solar activity report

Any mentioned solar flare in this report has a scaling factor applied by the Space Weather Prediction Center (SWPC). Because of the SWPC scaling factor, solar flares are reported as 42% smaller than for the science quality data. The scaling factor has been removed from our archived solar flare data to reflect the true physical units.
Report of Solar-Geophysical Activity 1998 Sep 24 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 267 Issued at 2200Z on 24 SEP 1998

IA. Analysis of Solar Active Regions and Activity from 23-2100Z to 24-2100Z

SOLAR ACTIVITY WAS LOW. THE TWO ACTIVE REGIONS WERE 8340 (N20W15) AND 8344 (S20W04). BOTH REGIONS PRODUCE 2 C-CLASS EVENTS EACH. BOTH REGIONS HAVE ALSO DEVELOPED INTO COMPLEX BETA-GAMMA-DELTA MAGNETIC CONFIGURATIONS. REGION 8340 HAS SHOWN PLAGE FLUCTUATIONS AND POINT BRIGHTENINGS FOR MOST OF THE DAY. THE REST OF THE REGIONS WERE STABLE AND MOSTLY QUIET. TWO NEW REGIONS WERE NUMBERED TODAY: REGION 8345 (N22W06) AND REGION 8346 (S30E41). THERE ARE NOW 10 SPOT GROUPS ON THE DISK.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO CONTINUE TO BE LOW TO MODERATE. REGIONS 8340 AND 8344 CAN BE EXPECTED TO CONTINUE TO PRODUCE C-CLASS FLARES AND POSSIBLE M-CLASS EVENTS.
IIA. Geophysical Activity Summary 23-2100Z to 24-2100Z
GEOMAGNETIC ACTIVITY WAS QUIET TO ACTIVE AT MIDDLE LATITUDES AND UNSETTLED TO MINOR STORM CONDITIONS AT HIGHER LATITUDES.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO BE UNSETTLED TO ACTIVE WITH POSSIBLE PERIODS OF MINOR STORM LEVELS ESPECIALLY AT HIGHER LATITUDES.
III. Event Probabilities 25 SEP to 27 SEP
Class M40%40%40%
Class X10%10%10%
Proton05%05%01%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       24 SEP 135
  Predicted   25 SEP-27 SEP  150/155/155
  90 Day Mean        24 SEP 129
V. Geomagnetic A Indices
OBSERVED AFR/AP 23 SEP  010/129
ESTIMATED AFR/AP 24 SEP  020/020
PREDICTED AFR/AP 25 SEP-27 SEP  030/025-020/030-015/020
VI. Geomagnetic Activity Probabilities 25 SEP to 27 SEP
A. Middle Latitudes
Active50%30%25%
Minor storm30%10%10%
Major-severe storm10%05%01%
B. High Latitudes
Active65%50%40%
Minor storm30%20%15%
Major-severe storm05%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!

23%
Support SpaceWeatherLive with our merchandise
Check out our merchandise

Latest alerts

Get instant alerts!

Space weather facts

Last X-flare2024/03/28X1.1
Last M-flare2024/03/29M3.2
Last geomagnetic storm2024/03/25Kp5 (G1)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
February 2024124.7 +1.7

This day in history*

Solar flares
12001X2.45
22014X1.45
32023X1.2
42024M3.2
52001M3.13
ApG
1199928G2
2200337G1
3201328G1
4200122G1
5199820G1
*since 1994

Social networks