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Spontaneous magnetic fluctuations and collisionless regulation of the Earth’s magnetotail

octubre 17 / 11:00 am - 12:00 pm

Dr. Pablo Moya
Departamento de Física,
Universidad de Chile

 
One of the fundamental and challenging problems of laboratory, space, and astrophysical plasma physics is the understanding of the relaxation processes of nearly collisionless plasmas, and the resultant state of electromagnetic plasma turbulence. Recently, it has been shown that solar wind plasma beta and temperature anisotropy observations are bounded by kinetic instabilities such as the ion cyclotron, mirror, and firehose instabilities, and that magnetic fluctuations observations are consistent with the predictions of the Fluctuation-Dissipation theorem even far below the kinetic instability thresholds. Here, using in-situ magnetic field and plasma data from the THEMIS spacecraft, we show that such regulation also occurs in the Earth’s plasma sheet at the ion scales. Regardless of the clear differences between the solar wind and the magnetosphere environments, spontaneous fluctuation and their collisionless regulation seem to be fundamental features of space and astrophysical plasmas, suggesting the universality of the processes

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Detalles

Fecha:
octubre 17
Hora:
11:00 am - 12:00 pm