Solar control of meteor radar rates

Details Solar control of meteor radar rates Solar control of meteor radar rates

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.535..755l&link_type=abstract

In: Solar variability as an input to the Earth's environment. International Solar Cycle Studies (ISCS) Symposium, 23 - 28 June 2

Physics

1

Meteors, Solar Activity Cycles, Solar Wind

Scientific paper

Meteor radar observations carried out in August-September 1953-84 at the Onsala Space Observatory in Sweden show long-term, as well as short term variations in meteor radar rates. These rate variations are associated with position in the solar cycle, and with variations in the solar wind sector structure. An inverse correlation is found between meteor radar rates and the solar cycle. The magnitude of this effect is quite large; about twice as many radar echoes are observed at solar minimum as at solar maximum. We propose that this long-term inverse correlation with the sunspot number is caused by a solar cycle controlled variation of the atmospheric density gradient at meteor ablation heights (90-110 km). Day-to-day variations in meteor radar rates, which correlate with short-term geomagnetic activity have also been detected. A superposed epoch analysis based on solar wind sector boundaries as key dates shows that a minimum in meteor radar rates occurs about 3 days after the Earth's passage of a solar wind sector boundary.

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