Excitation of tall auroral rays by ohmic heating in field-aligned current filaments at F region heights

Details Excitation of tall auroral rays by ohmic heating in field-aligned current filaments at F region heights Excitation of tall auroral rays by ohmic heating in field-aligned current filaments at F region heights

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003jgra..108.8017o&link_type=abstract

Journal of Geophysical Research (Space Physics), Volume 108, Issue A4, pp. COA 18-1, CiteID 8017, DOI 10.1029/2002JA009423

Physics

Plasma Physics

3

Ionosphere: Auroral Ionosphere (2704), Ionosphere: Ionospheric Dynamics, Space Plasma Physics: Transport Processes

Scientific paper

The formation of tall red rays in the ionosphere has been a longstanding unresolved problem of auroral physics. These rays are pencil-like structures which can extend from 150 km at their base to as high as 600 km. At these heights it is very difficult to deposit sufficient power in order to account for the luminosity of tall rays. This work examines ohmic heating by collisional processes in strong field-aligned current sheets to account for visible tall rays. The mechanism is demonstrated by two-dimensional simulation in a fully self-consistent treatment of the ionosphere and coupling to the magnetosphere. We find that a filamentary current density of about 600 μAm-2 over about ten seconds can pump sufficient energy into the ambient oxygen atoms to produce visible auroral red rays. The ohmic heating leads to an electron temperature in excess of 10,000 K in the upper F-region.

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