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

Jul 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aipc..382..545r&link_type=abstract

Proceedings of the eigth international solar wind conference: Solar wind eight. AIP Conference Proceedings, Volume 382, pp. 545

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Particle Emission, Solar Wind, Solar Wind Plasma, Sources Of Solar Wind

Scientific paper

We investigate the solar-cycle dependence of the occurrence rate in the solar wind of regions with abnormally low proton temperatures during the years 1965 to 1990. To identify such regions, we compare the observed temperature with the temperature expected from the proton temperature-solar wind speed correlation found in `normal' solar wind. The occurrence rate of abnormally low temperature plasma is correlated with solar activity levels and in particular with the rate of coronal mass ejections (CMEs) at the Sun. The low temperature regions show higher than chance associations with other signatures of ejecta in the solar wind. However abnormally low temperature plasma is not be a unique signature of ejecta since around 30% of the regions identified are related to encounters with the heliospheric plasma sheet, and the occurrence rate for these events depends more on the tilt angle of the heliospheric current sheet than on the CME rate.

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