Solar Activity Report for 4/21/05
- The Earth has moved inside of a high-speed solar wind stream coming
from a coronal hole. There was a brief G-1 geomagnetic storm at the
onset off the event, but conditions have quieted for the time being.
However, that could change, and the prediction is that the activity
level will increase over the next 48 hours. None of the two sunspot
regions currently visible appear to have the potential for touching
off a significant flare at this time. SOHO satellite solar magnetic
analysis shows what could be a fairly large sunspot region on the back
side of the sun.
The current solar and geomagnetic conditions are :
NOAA sunspot number : 22
SFI : 77
A index : 5
K index : 2
Solar wind speed : 452.2 km/sec
Solar wind density : 4.7 protons/cc
Solar wind pressure : 1.6 nPa
IMF : 7.8 nT
IMF Orientation : 0.2 nT North
GOES-12 Background X-ray Flux level : A1
Conditions for the last 24 hours :
No space weather storms were observed for the past 24 hours.
Forecast for the next 24 hours
No space weather storms are expected for the next 24 hours.
Solar activity forecast :
Solar activity is expected to be very low.
Geomagnetic activity forecast :
The geomagnetic field is expected to be quiet to unsettled early on 22
April. A geoeffective coronal hole high speed stream is expected to
increase conditions later in the day. Unsettled to active with minor
storm periods are possible late on 22 April continuing into early 23
April. Conditions are expected to settle down on 24 April to mostly
quiet to unsettled.
Recent significant solar flare activity :