Viewing archive of Sunday, 28 September 1997

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 1997 Sep 28 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 271 Issued at 2200Z on 28 SEP 1997

IA. Analysis of Solar Active Regions and Activity from 27-2100Z to 28-2100Z

SOLAR ACTIVITY WAS LOW DUE TO A C1/EPL ON THE SOUTHWEST LIMB (SW48) AT 28/1442Z. REGION 8088 (S29W41) IS THE ONLY SPOTTED REGION CURRENTLY ON THE VISIBLE DISK. THIS REGION HAS CHANGED LITTLE, MAINTAINING A MODERATELY SIZED D-CLASS SUNSPOT CONFIGURATION AND CONTINUING TO PRODUCE PLAGE FLUCTUATIONS ASSOCIATED WITH SMALL B-CLASS X-RAY OUTPUT.
IB. Solar Activity Forecast
SOLAR ACTIVITY IS EXPECTED TO BE LOW. THERE IS AN OUTSIDE CHANCE OF AN ISOLATED M-CLASS FLARE IN REGION 8088.
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
THE GEOMAGNETIC FIELD RANGED FROM QUIET TO MINOR STORM. SOLAR WIND DATA DOES NOT CLEARLY INDICATE THE ARRIVAL OF A SHOCK FROM THE CME ACTIVITY OBSERVED ON 23-24 SEP. CURRENT GEOMAGNETIC ACTIVITY MAY BE RELATED TO THE EQUATORWARD EXTENSION OF A POLAR CORONAL HOLE. THE GREATER THAN 2 MEV ELECTRON FLUX CROSSED THE HIGH THRESHOLD AT 28/1643Z.
IIB. Geophysical Activity Forecast
THE GEOMAGNETIC FIELD IS EXPECTED TO BE UNSETTLED TO ACTIVE. A DISTURBANCE RESULTING FROM THE ACTIVITY OBSERVED ON 23-24 SEP IS BECOMING LESS LIKELY.
III. Event Probabilities 29 SEP to 01 OCT
Class M10%10%05%
Class X01%01%01%
Proton01%01%01%
PCAFGREEN
IV. Penticton 10.7 cm Flux
  Observed       28 SEP 087
  Predicted   29 SEP-01 OCT  086/086/084
  90 Day Mean        28 SEP 082
V. Geomagnetic A Indices
OBSERVED AFR/AP 27 SEP  011/013
ESTIMATED AFR/AP 28 SEP  015/020
PREDICTED AFR/AP 29 SEP-01 OCT  020/020-015/012-010/010
VI. Geomagnetic Activity Probabilities 29 SEP to 01 OCT
A. Middle Latitudes
Active30%30%15%
Minor storm15%15%05%
Major-severe storm05%01%01%
B. High Latitudes
Active30%30%15%
Minor storm15%15%05%
Major-severe storm05%05%01%

All times in UTC

<< 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!

SpaceWeatherLive Pro
Support SpaceWeatherLive with our merchandise
Check out our merchandise

Latest alerts

Get instant alerts!

Space weather facts

Last X-flare2024/12/08X2.2
Last M-flare2024/12/25M4.9
Last geomagnetic storm2024/12/17Kp5+ (G1)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
November 2024152.5 -13.9
December 2024115.2 -37.3
Last 30 days120.1 -38.2

This day in history*

Solar flares
12011M5.77
22024M4.9
32024M2.8
41998M1.83
52001M1.76
DstG
11988-85
21998-57
31978-57G2
42014-49
52002-39
*since 1994

Social networks