Viewing archive of Friday, 4 February 2005

Solar activity report

Report of Solar-Geophysical Activity 2005 Feb 04 2200 UTC
Prepared by the NOAA © SWPC and processed by

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 035 Issued at 2200Z on 04 Feb 2005

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

Solar activity was low. A single C1 flare occurred at 04/1509Z from a source on the east limb near N14. This is likely the return of old Region 720 (N13, L=178), which produced several major flares during its previous transit across the visible disk. Several brightenings near the northeast limb suggest this region is still quite active. A CME at 04/0731Z occurred in association with a prominence eruption from the northeast limb. The CME does not appear to be Earth directed. New Region 730 (S20E73) was numbered today and produced occasional B-class flares.
IB. Solar Activity Forecast
Solar activity is expected to be low to moderate. The probability for M-class activty will increase following the return of old Region 720 on 05 February.
IIA. Geophysical Activity Summary 03-2100Z to 04-2100Z
The geomagnetic field was quiet. Solar wind speed began the period at over 500 km/s, but gradually decreased to near 430 km/s. The greater than 2 MeV electron flux at geosynchronous orbit was at high levels again today.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be predominantly quiet with occasional unsettled periods on 05 and 06 February. A coronal hole high speed stream is expected to rotate into geoeffective position on 07 February and induce occasional active periods.
III. Event Probabilities 05 Feb to 07 Feb
Class M15%25%25%
Class X05%05%05%
IV. Penticton 10.7 cm Flux
  Observed       04 Feb 082
  Predicted   05 Feb-07 Feb  090/100/115
  90 Day Mean        04 Feb 100
V. Geomagnetic A Indices
  Observed Afr/Ap 03 Feb  005/008
  Estimated     Afr/Ap 04 Feb  005/004
  Predicted    Afr/Ap 05 Feb-07 Feb  005/005-005/005-010/015
VI. Geomagnetic Activity Probabilities 05 Feb to 07 Feb
A. Middle Latitudes
Minor storm01%01%10%
Major-severe storm01%01%01%
B. High Latitudes
Minor storm05%05%20%
Major-severe storm01%01%05%

<< Go to daily overview page

Latest news


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!


Latest alerts

Get instant alerts!

Space weather facts

Last X-flare:2017/09/10X8.2
Last M-flare:2017/10/20M1.0
Last geomagnetic storm:2019/09/28Kp5 (G1)
Number of spotless days in 2019:216
Current stretch spotless days:18

This day in history*

Solar flares
*since 1994

Social networks