Solar activity report

Below you'll find a daily report brought to you by the NOAA about the solar activity and auroral activity during the past day and the prediction for the coming days. This page is daily updated around midnight.

Report of Solar-Geophysical Activity 2017 Apr 28 2200 UTC
Prepared by the NOAA © SWPC and processed by

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 118 Issued at 2200Z on 28 Apr 2017

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

Solar activity has been at very low levels for the past 24 hours. There are currently 3 numbered sunspot regions on the disk.
IB. Solar Activity Forecast
Solar activity is expected to be very low with a slight chance for a C-class flare on days one, two, and three (29 Apr, 30 Apr, 01 May).
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
The geomagnetic field has been at quiet levels for the past 24 hours. Solar wind speed reached a peak of 493 km/s at 27/2351Z. Total IMF reached 5 nT at 28/1949Z. The maximum southward component of Bz reached -5 nT at 28/2049Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 56297 pfu. NOTE: From 28/1727-1913 UTC, solar wind speed, temperature, and density registered incorrect readings.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet levels on day one (29 Apr), quiet to unsettled levels on day two (30 Apr) and quiet to active levels on day three (01 May).
III. Event Probabilities 29 Apr to 01 May
Class M 01%01%01%
Class X 01%01%01%
IV. Penticton 10.7 cm Flux
  Observed       28 Apr 078
  Predicted    29 Apr-01 May 078/078/076
  90 Day Mean        28 Apr 077

V. Geomagnetic A Indices
  Observed Afr/Ap 27 Apr  010/008
  Estimated     Afr/Ap 28 Apr  005/006
  Predicted     Afr/Ap 29 Apr-01 May  005/005-008/008-011/012

VI. Geomagnetic Activity Probabilities 29 Apr to 01 May
A. Middle Latitudes
Minor storm 01%05%05%
Major-severe storm 01%01%01%
B. High Latitudes
Minor storm 15%20%30%
Major-severe storm 10%20%30%
Current data suggest that it is not possible to see aurora now at middle latitudes

Latest news

Today's space weather

Auroral activity Minor Severe
High latitude 15% 10%
Middle latitude 1% 1%
Predicted Kp max 2
Solar activity
M-class solar flare 1%
X-class solar flare 1%
Moon phase
Waxing Crescent


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Last X-flare:2015/05/05X2.7
Last M-flare:2017/04/03M5.8
Last geomagnetic storm:2017/04/23Kp6 (G2)
Number of spotless days in 2017:30
Last spotless day:2017/04/17

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