Product: Weekly Highlights and Forecasts:Issued: 2010 Apr 20 2051 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC web contact: www.swpc.noaa.gov/weekly.html
Highlights of Solar and Geomagnetic Activity
12 - 18 April 2010
Solar activity was at very low levels. Only a few, low-level B-class flares occurred during the week. Two of these were long duration events at 17/0557 UTC and 18/0218 UTC, apparently from a new region just rotating onto the solar disk at the end of the summary period. The only spotted group at the start of the period was Region 1062 (S18, L=134, class/area Cro/020 on 13 April), but the group decayed to plage on 15 April and the solar disk was spotless for the remainder of the period.
No proton events were observed at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit varied between normal background and moderate levels throughout the period with the exception of a brief interval at high levels between 2000-2200 UTC on 14 April.
The geomagnetic field began the week with a strong substorm between 0000-0300 UTC on 12 April; activity reached major to severe storm levels during the interval. Predominantly active conditions followed from 0300-0900 UTC, unsettled levels from 0900-1800 UTC, after which the field returned to quiet levels. Quiet levels continued until 2100 UTC on 14 April when an interval of active to minor storm levels occurred, followed by unsettled to active levels for 0000-0600 UTC on 15 April. The remainder of the summary period was quiet. The substorm and subsequent activity on 12 April was associated with transient flow observed by the ACE spacecraft, most likely caused by the CME that was observed on 08 April. The enhanced activity late on 14 April and early on 15 April was most likely associated with a co-rotating interaction region leading a high speed stream from a geo-effectively positioned coronal hole.
Forecast of Solar and Geomagnetic Activity
21 April - 17 May 2010
Solar activity is expected to be at very low levels with possible isolated periods of low levels during the forecast period.
No proton events are expected at geosynchronous orbit.
The greater than 2 MeV electron flux at geosynchronous orbit is expected to be at normal levels through most of the period. However, moderate to high flux levels are possible during 05-08 May.
The geomagnetic field is expected to be mostly unsettled, with a chance for isolated active periods from 21-24 April due to possible effects from a high speed stream from a coronal hole, as well as possible contributions from recent CME activity on 18-19 April. Quiet conditions are expected to prevail from 25 April to 03 May. Generally unsettled levels are expected for 04-05 May due to a recurrent high speed stream. Activity is expected to return to quiet levels during the remainder of the period 06-17 May.
Product: 27-day Space Weather Outlook Table 27DO.txt:Issued: 2010 Apr 20 2051 UTC
# Prepared by the US Dept. of Commerce, NOAA, Space Weather Prediction Center
# Product description and SWPC web contact: www.swpc.noaa.gov/wwire.html
#
# 27-day Space Weather Outlook Table
# Issued 2010 Apr 20
#
# UTC Radio Flux Planetary Largest
# Date 10.7 cm A Index Kp Index
2010 Apr 21 80 12 3
2010 Apr 22 82 15 3
2010 Apr 23 84 12 3
2010 Apr 24 84 8 3
2010 Apr 25 84 5 2
2010 Apr 26 84 5 2
2010 Apr 27 80 5 2
2010 Apr 28 80 5 2
2010 Apr 29 80 5 2
2010 Apr 30 80 5 2
2010 May 01 80 5 2
2010 May 02 80 5 2
2010 May 03 80 5 2
2010 May 04 75 8 3
2010 May 05 75 8 3
2010 May 06 75 5 2
2010 May 07 75 5 2
2010 May 08 75 5 2
2010 May 09 75 5 2
2010 May 10 75 5 2
2010 May 11 75 5 2
2010 May 12 75 5 2
2010 May 13 75 5 2
2010 May 14 75 5 2
2010 May 15 75 5 2
2010 May 16 75 5 2
2010 May 17 80 5 2
(NOAA)
