The development of the substorm in auroral radio absorption

Details The development of the substorm in auroral radio absorption The development of the substorm in auroral radio absorption

Jun 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975p%26ss...23..905h&link_type=abstract

Planetary and Space Science, vol. 23, June 1975, p. 905-911.

Physics

9

Auroral Absorption, Magnetospheric Instability, Polar Substorms, Auroral Arcs, Convective Flow, Electric Fields, Magnetic Measurement, Radio Attenuation, Riometers

Scientific paper

Observations with a meridional chain of riometers in the auroral zone show that the onset of an auroral absorption substorm is usually preceded by weak activity. This activity sometimes takes the form of a weak bay-like event, moving slowly equatorward. Its velocity (typically 200-500 m/sec) is consistent with the inward convection of energetic plasma in the magnetosphere - that is, with E x B drift in an electric field of about 1.3 mV/m. The bay intensifies as it moves, indicating energization of the plasma during convection.

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