Viewing archive of Wednesday, 21 April 2021

Solar activity report

Report of Solar-Geophysical Activity 2021 Apr 21 2200 UTC
Prepared by the NOAA © SWPC and processed by SpaceWeatherLive.com

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 111 Issued at 2200Z on 21 Apr 2021

IA. Analysis of Solar Active Regions and Activity from 20-2100Z to 21-2100Z

Solar activity has been at low levels for the past 24 hours. The largest solar event of the period was a C1 event observed at 21/0129Z from Region 2817 (N18W79). There are currently 3 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be very low with a chance for a C-class flares and a slight chance for an M-class flare on day one (22 Apr) and expected to be very low with a chance for a C-class flares on day two (23 Apr) and expected to be very low with a slight chance for a C-class flare on day three (24 Apr).
IIA. Geophysical Activity Summary 20-2100Z to 21-2100Z
The geomagnetic field has been at quiet to unsettled levels for the past 24 hours. Solar wind speed reached a peak of 605 km/s at 20/2101Z. Total IMF reached 5 nT at 21/0109Z. The maximum southward component of Bz reached -3 nT at 21/0548Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 12719 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet levels on day one (22 Apr) and quiet to active levels on days two and three (23 Apr, 24 Apr).
III. Event Probabilities 22 Apr to 24 Apr
Class M10%05%01%
Class X01%01%01%
Proton01%01%01%
PCAFgreen
IV. Penticton 10.7 cm Flux
  Observed       21 Apr 078
  Predicted   22 Apr-24 Apr 080/078/078
  90 Day Mean        21 Apr 076

V. Geomagnetic A Indices
  Observed Afr/Ap 20 Apr  010/012
  Estimated     Afr/Ap 21 Apr  007/008
  Predicted    Afr/Ap 22 Apr-24 Apr  005/005-009/010-009/010

VI. Geomagnetic Activity Probabilities 22 Apr to 24 Apr
A. Middle Latitudes
Active15%40%40%
Minor storm01%15%15%
Major-severe storm01%01%01%
B. High Latitudes
Active15%10%10%
Minor storm20%25%25%
Major-severe storm20%50%50%

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!

98%
Support SpaceWeatherLive with our merchandise
Check out our merchandise

Latest alerts

Get instant alerts!

Space weather facts

Last X-flare2024/07/14X1.2
Last M-flare2024/07/14M1.0
Last geomagnetic storm2024/06/28Kp8- (G4)
Spotless days
Last spotless day2022/06/08
Monthly mean Sunspot Number
June 2024164.2 -7.5
July 2024156 -8.2
Last 30 days155.8 +6.4

This day in history*

Solar flares
12000X8.21
22005X1.86
32005X1.3
42024X1.2
52004M8.91
DstG
11982-325G5
21991-158G3
31961-132G4
42013-81G1
51984-60G2
*since 1994

Social networks