Viewing archive of Friday, 1 April 2011

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 2011 Apr 01 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 091 Issued at 2200Z on 01 Apr 2011

IA. Analysis of Solar Active Regions and Activity from 31-2100Z to 01-2100Z

Solar activity remained at low levels. Region 1178 (S17W36) produced a C1/Sf at 31/2221Z associated with a partial-halo CME that appeared to be directed southward, out of the ecliptic plane. Region 1178 decayed to a plage area during the period. Region 1176 (S16W65) produced C3 flares at 01/0156Z and 01/0354Z, each of which were associated with CME activity. This CME activity also appeared to be directed southward, out of the ecliptic plane. Region 1176 gradually decayed during the period with a loss of spot count and area. It was classified as an Fso-type with a simple beta magnetic configuration. Region 1183 (N17E01) showed a gradual increase in spot count and area and was classified as an Esi-type with a beta magnetic configuration. New Region 1184, a single-spot Axx-type, was numbered.
IB. Solar Activity Forecast
Solar activity is expected to be low during the period (02 - 04 April) with a slight chance for moderate activity (isolated M-class).
IIA. Geophysical Activity Summary 31-2100Z to 01-2100Z
Geomagnetic activity increased to quiet to active levels. ACE solar wind observations indicated the onset of a coronal hole high-speed stream (CH HSS) at approximately 01/1600Z. Velocities increased to a peak of 495 km/s at 01/1801Z. IMF changes associated with the CH HSS included increased Bt (peaks to 12 nT during 01/2000 - 2100Z) and intervals of southward Bz (maximum deflection -10 nT at 01/1628Z).
IIB. Geophysical Activity Forecast
Geomagnetic activity is expected to be at quiet to unsettled levels during day 1 (02 April) with a chance for active levels as CH HSS effects persist. Activity is expected to decrease to mostly quiet levels during days 2 - 3 (03 - 04 April) as CH HSS effects subside.
III. Event Probabilities 02 Apr to 04 Apr
Class M25%25%25%
Class X01%01%01%
Proton01%01%01%
PCAFgreen
IV. Penticton 10.7 cm Flux
  Observed       01 Apr 109
  Predicted   02 Apr-04 Apr  110/110/110
  90 Day Mean        01 Apr 098
V. Geomagnetic A Indices
  Observed Afr/Ap 31 Mar  002/003
  Estimated     Afr/Ap 01 Apr  010/013
  Predicted    Afr/Ap 02 Apr-04 Apr  007/007-005/005-005/005
VI. Geomagnetic Activity Probabilities 02 Apr to 04 Apr
A. Middle Latitudes
Active20%15%10%
Minor storm05%05%01%
Major-severe storm01%01%01%
B. High Latitudes
Active25%20%15%
Minor storm10%10%01%
Major-severe storm01%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-flare2024/12/22M1.0
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