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 May 28 2200 UTC
Prepared by the NOAA © SWPC and processed by

Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 148 Issued at 2200Z on 28 May 2017

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

Solar activity has been at low levels for the past 24 hours. The largest solar event of the period was a C3 event observed at 28/1928Z from Region 2659 (N13W70). There are currently 1 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 on days one and two (29 May, 30 May) and expected to be very low with a slight chance for a C-class flare on day three (31 May).
IIA. Geophysical Activity Summary 27-2100Z to 28-2100Z
The geomagnetic field has been at quiet to severe storm levels for the past 24 hours. Solar wind speed reached a peak of 463 km/s at 27/2243Z. Total IMF reached 23 nT at 27/2222Z. The maximum southward component of Bz reached -20 nT at 27/2222Z. Electrons greater than 2 MeV at geosynchronous orbit reached a peak level of 641 pfu.
IIB. Geophysical Activity Forecast
The geomagnetic field is expected to be at quiet to active levels on day one (29 May) and quiet levels on days two and three (30 May, 31 May).
III. Event Probabilities 29 May to 31 May
Class M 05%05%01%
Class X 01%01%01%
IV. Penticton 10.7 cm Flux
  Observed       28 May 079
  Predicted    29 May-31 May 078/072/070
  90 Day Mean        28 May 076

V. Geomagnetic A Indices
  Observed Afr/Ap 27 May  014/017
  Estimated     Afr/Ap 28 May  036/060
  Predicted     Afr/Ap 29 May-31 May  012/012-005/005-005/005

VI. Geomagnetic Activity Probabilities 29 May to 31 May
A. Middle Latitudes
Minor storm 05%01%01%
Major-severe storm 01%01%01%
B. High Latitudes
Minor storm 20%15%15%
Major-severe storm 15%10%10%
Current data suggest that it is not possible to see aurora now at middle latitudes
The strength of the interplanetary magnetic field is moderate (10.39nT), the direction is North (4.71nT).

Latest news

Today's space weather

Auroral activity Minor Severe
High latitude 20% 15%
Middle latitude 5% 1%
Predicted Kp max 4
Solar activity
M-class solar flare 5%
X-class solar flare 1%
Moon phase
Waxing Crescent


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!


Get instant alerts!

Space weather facts

Last X-flare:2015/05/05X2.7
Last M-flare:2017/04/03M5.8
Last geomagnetic storm:2017/05/28Kp7 (G3)
Number of spotless days in 2017:37
Last spotless day:2017/05/15

This day in history*

Solar flares
*since 1994