Viewing archive of Friday, 12 April 2002

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 2002 Apr 12 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 102 Issued at 2200Z on 12 Apr 2002

IA. Analysis of Solar Active Regions and Activity from 11-2100Z to 12-2100Z

Solar activity was at moderate levels. Region 9901 (N21W26) produced an M4/1F flare on 12/1802 UTC with an associated Type IV Radio Sweep. Region 9893 (N20W39) has developed a delta magnetic configuration in the trailing spot and has increased in area and spot count. LASCO/EIT imagery indicates that Region 9893 is the most likely source of an optically uncorrelated M1.4 flare that occurred on 12/1310 UTC. Region 9906 (S16E26) has shown rapid growth in spot count, area, and now has a beta-gamma magnetic configuration. This region also shows some indication of a developing delta magnetic configuration. As Region 9907 (S05E61) rotates onto the disk it has revealed a moderate size spot group and a beta-gamma magnetic classification. One new region was numbered today: Region 9908 (N05W25).
IB. Solar Activity Forecast
Solar activity is expected to be moderate. Region 9893/9901 complex has been active and has two delta configurations. The potential for M-class events is good. Region 9906 and 9907 are developing and have a slight chance of M-class events.
IIA. Geophysical Activity Summary 11-2100Z to 12-2100Z
The geomagnetic field was at quiet to unsettled levels with one 3 hour period of minor storm conditions. This isolated minor storm condition coincided with a sector boundary crossing. At the time of this issue the NASA/ACE EPAM data have shown a steady increase in low energy protons possibly due to expected CME shock.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be quiet to active. A CME shock is expected midday on day one of the forecast period. A second shock expected midday on day two of the forecast period.
III. Event Probabilities 13 Apr to 15 Apr
Class M65%65%60%
Class X10%10%10%
Proton10%10%05%
PCAFyellow
IV. Penticton 10.7 cm Flux
  Observed       12 Apr 212
  Predicted   13 Apr-15 Apr  210/210/205
  90 Day Mean        12 Apr 202
V. Geomagnetic A Indices
  Observed Afr/Ap 11 Apr  010/013
  Estimated     Afr/Ap 12 Apr  014/015
  Predicted    Afr/Ap 13 Apr-15 Apr  015/015-015/020-010/015
VI. Geomagnetic Activity Probabilities 13 Apr to 15 Apr
A. Middle Latitudes
Active25%30%30%
Minor storm10%15%15%
Major-severe storm05%05%05%
B. High Latitudes
Active25%30%30%
Minor storm10%15%15%
Major-severe storm05%05%05%

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-flare2024/12/22M1.0
Last geomagnetic storm2024/12/17Kp5+ (G1)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
November 2024152.5 -13.9
December 2024103.3 -49.2
Last 30 days115.4 -40.8

This day in history*

Solar flares
11999M7.71
22013M4.82
32023M3.33
42013M2.8
51999M2.61
DstG
11982-101G3
22014-71G1
32001-59
41987-59
51989-58G1
*since 1994

Social networks