Viewing archive of Friday, 4 April 2008

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 2008 Apr 04 2203 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 095 Issued at 2200Z on 04 Apr 2008

IA. Analysis of Solar Active Regions and Activity from 03-2100Z to 04-2100Z

Solar activity was very low. Spotless plage Region 989 (S11W54) produced isolated B-class subflares. No new regions were numbered.
IB. Solar Activity Forecast
Solar activity is expected to be very low to low. There is a fair chance for an isolated C-class flare from Region 989.
IIA. Geophysical Activity Summary 03-2100Z to 04-2100Z
Geomagnetic field activity was at quiet to active levels. Field activity increased to active levels during 04/1800 - 2100Z due to increased solar wind velocities and IMF magnitude combined with periods of southward IMF Bz. ACE signatures indicated Earth entered the co-rotating interaction region between slow and fast solar wind flows. Velocities increased to 507 km/sec near the close of the summary period. The greater than 2 MeV electron flux at geosynchronous orbit was high during most of the period.
IIB. Geophysical Activity Forecast
Geomagnetic field activity is expected to be at active levels during days 1 - 2 (05 - 06 April) with minor to major storm periods at high latitudes due to coronal hole effects. Field activity is expected to decrease to unsettled levels on day 3 (07 April) with active to minor storm periods at high latitudes as coronal hole effects decrease.
III. Event Probabilities 05 Apr to 07 Apr
Class M01%01%01%
Class X01%01%01%
Proton01%01%01%
PCAFgreen
IV. Penticton 10.7 cm Flux
  Observed       04 Apr 073
  Predicted   05 Apr-07 Apr  070/070/070
  90 Day Mean        04 Apr 073
V. Geomagnetic A Indices
  Observed Afr/Ap 03 Apr  002/002
  Estimated     Afr/Ap 04 Apr  007/010
  Predicted    Afr/Ap 05 Apr-07 Apr  015/015-012/015-010/012
VI. Geomagnetic Activity Probabilities 05 Apr to 07 Apr
A. Middle Latitudes
Active40%30%25%
Minor storm10%10%05%
Major-severe storm01%01%01%
B. High Latitudes
Active50%50%30%
Minor storm25%25%10%
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!

100%
Support SpaceWeatherLive with our merchandise
Check out our merchandise

Latest alerts

Get instant alerts!

Space weather facts

Last X-flare2024/11/06X2.39
Last M-flare2024/11/20M1.1
Last geomagnetic storm2024/11/10Kp5+ (G1)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
October 2024166.4 +25
November 2024142.7 -23.8
Last 30 days156.1 +4.7

This day in history*

Solar flares
11998X5.37
21998X3.59
32001X1.41
42001M5.51
51998M2.7
DstG
11991-139G2
21982-114G2
31975-97G2
42003-87G2
51960-76G2
*since 1994

Social networks