Viewing archive of Wednesday, 28 April 2004

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 2004 Apr 28 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 119 Issued at 2200Z on 28 Apr 2004

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

Solar activity has been very low. Region 596 (S08W79) was stable in size and Region 599 (N15W11) exhibited gradual decay. No new regions were numbered today.
IB. Solar Activity Forecast
Solar activity is expected to be very low to low. Isolated C-class flares are possible from Regions 596 and 599.
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
The geomagnetic field has been quiet to active. A rise in solar wind speed from 400 to 550 km/s was observed late in the period which may have given rise to isolated active geomagnetic conditions.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to unsettled levels, with isolated active to minor storm conditions possible on day two (30 April). Activity should return to quiet to unsettled levels on 1 May.
III. Event Probabilities 29 Apr to 01 May
Class M05%05%05%
Class X01%01%01%
Proton01%01%01%
PCAFgreen
IV. Penticton 10.7 cm Flux
  Observed       28 Apr 090
  Predicted   29 Apr-01 May  090/090/090
  90 Day Mean        28 Apr 106
V. Geomagnetic A Indices
  Observed Afr/Ap 27 Apr  005/005
  Estimated     Afr/Ap 28 Apr  005/007
  Predicted    Afr/Ap 29 Apr-01 May  005/008-010/020-005/010
VI. Geomagnetic Activity Probabilities 29 Apr to 01 May
A. Middle Latitudes
Active15%20%15%
Minor storm10%15%10%
Major-severe storm05%10%05%
B. High Latitudes
Active30%30%30%
Minor storm15%20%20%
Major-severe storm05%10%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-flare2024/12/23M1.0
Last geomagnetic storm2024/12/17Kp5+ (G1)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
November 2024152.5 -13.9
December 2024106.6 -45.9
Last 30 days116.1 -41.8

This day in history*

Solar flares
12015M6.75
21998M3.34
32013M2.36
42013M1.97
52001M1.69
DstG
12002-67
22000-62G2
31989-60
42014-57
51982-53G1
*since 1994

Social networks