Status Report

Joint USAF/NOAA Report of Solar and Geophysical Activity 28 May 2009

By SpaceRef Editor
May 29, 2009
Filed under , , ,

:Product: Report of Solar-Geophysical Activity
:Issued: 2009 May 28 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 148 Issued at 2200Z on 28 May 2009

IA. Analysis of Solar Active Regions and Activity from 27/2100Z
to 28/2100Z: Solar activity continued to be very low. The disk is
spotless and no flares occurred.

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

IIA. Geophysical Activity Summary 27/2100Z to 28/2100Z:
The geomagnetic field was quiet to mildly unsettled. A sudden impulse
measuring 33 nT at Boulder occurred at 0520 UTC, bringing unsettled
conditions in its wake. The source of this impulse is of dubious

IIB. Geophysical Activity Forecast: The geomagnetic field is
expected to be quiet throughout the forecast period.

III. Event Probabilities 29 May-31 May
Class M 01/01/01
Class X 01/01/01
Proton 01/01/01
PCAF Green

IV. Penticton 10.7 cm Flux
Observed 28 May 068
Predicted 29 May-31 May 068/068/068
90 Day Mean 28 May 069

V. Geomagnetic A Indices
Observed Afr/Ap 27 May 002/003
Estimated Afr/Ap 28 May 005/005
Predicted Afr/Ap 29 May-31 May 005/005-005/005-005/005

VI. Geomagnetic Activity Probabilities 29 May-31 May

A. Middle Latitudes
Active 15/10/10
Minor storm 01/01/01
Major-severe storm 01/01/01

B. High Latitudes
Active 15/15/10
Minor storm 01/01/01
Major-severe storm 01/01/01

SpaceRef staff editor.