Solar activity was very low. No flares occurred during the past 24 hours. Region 992 (N13W17) has been quiet and stable and is a small, simple C-type sunspot group.

Solar activity is expected to be very low.

The geomagnetic field was initially unsettled but after 0300Z increased to predominantly active levels. In addition there were two minor storm periods; the first from 0600-0900Z and the second from 1500-1800Z. ACE real-time solar wind data show a slow increase in solar wind speeds at the beginning of the period followed by a marked increase in speed and temperature around 0400Z. The magnetic field observations at ACE also indicate a gradual increase as well as an extended period of mostly southward Bz from 0200Z to about 1700Z. The signatures are consistent with a co-rotating interaction region followed by a high speed solar wind stream. Solar wind speed remains elevated with values around 640 km/s at forecast issue time.

The geomagnetic field is expected to be unsettled to active with a chance for isolated minor storm periods for the first day (24 April) as the high speed stream persists. Activity is expected to decline to predominantly unsettled for the second day (25 April) and to predominantly quiet for the third data (26 April).

  Observed       23 Apr 071
  Predicted   24 Apr-26 Apr  070/070/070
  90 Day Mean        23 Apr 072

  Observed Afr/Ap 22 Apr  004/005
  Estimated     Afr/Ap 23 Apr  020/020
  Predicted    Afr/Ap 24 Apr-26 Apr  015/015-010/012-005/005