Wind/SWE Observations of the Role of Instabilities in CME Ejecta

Details Wind/SWE Observations of the Role of Instabilities in CME Ejecta Wind/SWE Observations of the Role of Instabilities in CME Ejecta

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agusmsh21a..08k&link_type=abstract

American Geophysical Union, Spring Meeting 2002, abstract #SH21A-08

Physics

2111 Ejecta, Driver Gases, And Magnetic Clouds, 2134 Interplanetary Magnetic Fields, 2159 Plasma Waves And Turbulence, 2164 Solar Wind Plasma

Scientific paper

The ion portion of the Solar Wind Experiment on the Wind spacecraft consists of two Faraday Cup instruments. Since launch in 1994, the Faraday Cups have recorded the velocity space distribution of proton and alpha particles in more than 2 million solar wind spectra. Recently we have extended our analysis of solar wind ions to treat each species as a convected bi-Maxwellian, yielding parallel and perpendicular temperatures. These measurements have been used in a general statistical study of limits to proton temperature anisotropies in the solar wind imposed by the mirror, cyclotron and firehose instabilities. This limit has been quantified by experimentally determining the threshold value of the ion anisotropy for the onset of each instability as a function of plasma parameters such as the parallel proton plasma beta, β {∥ p}, the ratio of particle to field pressure. We have identified a portion of the overall dataset which corresponds to material in the solar wind associated with Coronal Mass Ejections (CMEs). We compare observed temperature anisotropies in these intervals to the threshold conditions and report on the degree to which these instabilities appear to play a role in generating or enhancing CME complexity.

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