Viewing archive of Thursday, 9 April 2009

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 2009 Apr 09 2201 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 099 Issued at 2200Z on 09 Apr 2009

IA. Analysis of Solar Active Regions and Activity from 08-2100Z to 09-2100Z

Solar activity was very low. No flares were observed during the past 24 hours. The solar disk remains spotless.
IB. Solar Activity Forecast
Solar activity is expected to be very low.
IIA. Geophysical Activity Summary 08-2100Z to 09-2100Z
The geomagnetic field was at quiet to active conditions. The ACE spacecraft observed a continued rise in solar wind velocity during the last 24 hours reflecting the arrival of the coronal hole high speed stream. Wind speeds averaged around 480 km/s with Bz fluctuations +/- 5 nT.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to unsettled levels for 10 April. Predominantly quiet conditions should return for 11-12 April.
III. Event Probabilities 10 Apr to 12 Apr
Class M01%01%01%
Class X01%01%01%
Proton01%01%01%
PCAFGreen
IV. Penticton 10.7 cm Flux
  Observed       09 Apr 070
  Predicted   10 Apr-12 Apr  070/070/070
  90 Day Mean        09 Apr 070
V. Geomagnetic A Indices
  Observed Afr/Ap 08 Apr  004/005
  Estimated     Afr/Ap 09 Apr  009/013
  Predicted    Afr/Ap 10 Apr-12 Apr  007/008-005/005-005/005
VI. Geomagnetic Activity Probabilities 10 Apr to 12 Apr
A. Middle Latitudes
Active30%05%05%
Minor storm05%01%01%
Major-severe storm01%01%01%
B. High Latitudes
Active35%10%10%
Minor storm10%01%01%
Major-severe storm05%01%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-flare2024/12/22M1.1
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 days114 -43.9

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