On the velocity distribution of ion jets during substorm recovery

Details On the velocity distribution of ion jets during substorm recovery On the velocity distribution of ion jets during substorm recovery

Oct 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981jgr....86.9001b&link_type=abstract

Journal of Geophysical Research, vol. 86, Oct. 1, 1981, p. 9001-9006. Research supported by the Deutsche Forschungsgemeinschaft

Physics

23

Ion Motion, Magnetic Storms, Magnetospheric Instability, Plasma Jets, Velocity Distribution, Adiabatic Conditions, Atmospheric Models, Geomagnetic Tail, Plasma Layers, Satellite Observation

Scientific paper

The velocity distribution of earthward jetting ions that are observed principally during substorm recovery by satellites at approximately 15-35 earth radii in the magnetotail is quantitatively compared with two different theoretical models - the 'adiabatic deformation' of an initially flowing Maxwellian moving into higher magnetic field strength (model A) and the field-aligned electrostatic acceleration of an initially nonflowing isotropic Maxwellian including adiabatic deformation effects (model B). The assumption is made that the ions are protons or, more generally, that they consist of only one species. It is found that both models can explain the often observed concave-convex shape of isodensity contours of the distribution function.

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