The Occurrence Rate of Solar Wind Periodic Number Density Structures

Details The Occurrence Rate of Solar Wind Periodic Number Density Structures The Occurrence Rate of Solar Wind Periodic Number Density Structures

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsh11b0264v&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SH11B-0264

Physics

2164 Solar Wind Plasma, 2784 Solar Wind/Magnetosphere Interactions

Scientific paper

The solar wind is generally described as a fully turbulent plasma, with a featureless power-law spectrum that does not contain excess power at discrete frequencies. However, recent observations have indicated that the solar wind sometimes contains highly periodic number density variations in the mHz range in the Earth's reference frame. These periodic structures remained coherent over several hours and were highly geoeffective, driving global magnetospheric oscillations at the same discrete frequencies. These previous studies examined only a few events, and did not determine the occurrence rate of these structures. In this paper we determine the occurrence rate of discrete oscillations in the solar wind number density. We perform a multi-tapered analysis for spectral estimation and robust significance testing using several years of solar wind data. In addition we attempt to reconcile the turbulent picture of the solar wind with the new observations.

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