Regions of abnormally low proton temperature as signatures of ejecta: Solar cycle dependence and association with other ejecta signatures

Details Regions of abnormally low proton temperature as signatures of ejecta: Solar cycle dependence and association with other ejecta signatures Regions of abnormally low proton temperature as signatures of ejecta: Solar cycle dependence and association with other ejecta signatures

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sowi.conf...98r&link_type=abstract

NASA Goddard Space Flight Center, International Solar Wind 8 Conference, p. 98

Physics

Solar Wind, Low Temperature, Stellar Mass Ejection, Temperature Distribution, Protons, Signatures, Solar Physics, Solar Cycles, Solar Activity Effects, Coronagraphs, Satellite Observation, Helios Satellites, Solar Wind Velocity, Time Series Analysis, Temperature Dependence

Scientific paper

Solar wind proton temperatures lower than expected for 'normal' solar wind expansion are a common signature of 'ejecta' (i.e. interplanetary coronal mass ejections). We have surveyed the OMNI solar wind data base for 1965-1991, and Helios data for 1974-1980, to identify regions of abnormally low temperatures. Their occurrence rate is clearly dependent on solar activity levels, in particular when the minority of events associated with encounters with the heliospheric plasma sheet are excluded. The analysis of the OMNI data may provide an indication of the rate of ejecta at the Earth, and hence of the CME rate, extending back to before spacecraft coronagraph observations became available in the early 1970's. We discuss the association of these solar wind structures with cosmic ray depressions bidirectional particle flows, and other ejecta signatures. Our impression is that no one ejecta signature provides a truly comprehensive indication of the presence of ejecta, but that abnormally low temperature depressions encompass most of the regions identified by these other individual signatures.

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