Adverse Space Weather at the Solar Cycle Minimum

Details Adverse Space Weather at the Solar Cycle Minimum Adverse Space Weather at the Solar Cycle Minimum

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agusmsh31c..05b&link_type=abstract

American Geophysical Union, Spring Meeting 2008, abstract #SH31C-05

Mathematics

Logic

2102 Corotating Streams, 2162 Solar Cycle Variations (7536), 7934 Impacts On Technological Systems, 7984 Space Radiation Environment

Scientific paper

It is commonly understood that many types of adverse space weather (solar flares, coronal mass ejections, geomagnetic storms) occur most commonly around the maximum of the 11-year sunspot activity cycle. Other types of well-known space weather such as relativistic electron events in the Earth's outer magnetosphere (that produce deep dielectric charging in spacecraft systems) are usually associated with the period just after sunspot maximum. At the present time, we are in the very lowest activity phase of the sunspot cycle (solar minimum). As such we would not expect much in the way of adverse space weather events. However, in early to mid-February of 2008 quite prominent solar coronal holes produced two high-speed streams that in turn stimulated very large, long-duration relativistic electron enhancements in Earth's magnetosphere. These seem to have been associated with several spacecraft operational anomalies at various spacecraft orbital locations. We describe these recent space weather events and assess their operational significance in this presentation. These results show that substantial space weather events can and do occur even during the quietest parts of the solar cycle.

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