Status Report

Joint USAF/NOAA Report of Solar and Geophysical Activity 11 Apr 2009

By SpaceRef Editor

April 12, 2009

Filed under Earth, Space Weather Prediction Center (NOAA), Space Weather Solar-Geophysical Activity, US

Product: Report of Solar-Geophysical Activity
Issued: 2009 Apr 11 2200 UTC
Prepared jointly by the U.S. Dept. of Commerce, NOAA,
Space Weather Prediction Center and the U.S. Air Force.

Joint USAF/NOAA Report of Solar and Geophysical Activity
SDF Number 101 Issued at 2200Z on 11 Apr 2009

IA. Analysis of Solar Active Regions and Activity from 10/2100Z to 11/2100Z: Solar activity was very low. No flares occurred during the past 24 hours. The solar disk continues to be void of sunspots.

IB. Solar Activity Forecast: Solar activity is expected to be very low.

IIA. Geophysical Activity Summary 10/2100Z to 11/2100Z: The geomagnetic field was predominantly quiet to unsettled, with an isolated active period from 0000-0300Z. Solar wind velocity remained elevated during the past 24 hours, ranging between 500-560 km/s. The solar wind signatures are consistent with the continuation of a high speed stream from a coronal hole. The greater than 2 MeV electron flux at geosynchronous orbit reached high levels during the past 24 hours.

IIB. Geophysical Activity Forecast: The geomagnetic field is expected to be mostly quiet with a chance for unsettled levels and a slight chance for an isolated active period on the first day (12 April) due to the continued presence of elevated solar wind velocities. Activity levels are expected to be quiet for the second and third days (13-14 April).

III. Event Probabilities 12 Apr-14 Apr