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Ohmic heating as evidence for strong field-aligned currents in filamentary aurora

By B.S. Lanchester, D. Lummerzheim, A. Otto, M.H. Rees, K.J.F. Sedgemore-Schulthess, H. Zhu and I.W. McCrea


A large increase in electron temperature measured in filamentary aurora with the European incoherent scatter radar has been modeled with a one-dimensional electron transport and ion chemistry code. To account for the observed changes in electron temperature, while also reproducing the measured E region electron density profiles, a source of electron heating is required in addition to local heating from energy degradation of the precipitating electrons. We show that ohmic heating in a strong field-aligned current can account for the required heat source.<br/

Topics: QB, QC
Year: 2001
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Provided by: e-Prints Soton
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