Time-sequence of polar magnetic substorms

Details Time-sequence of polar magnetic substorms Time-sequence of polar magnetic substorms

Nov 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975p%26ss...23.1483k&link_type=abstract

Planetary and Space Science, vol. 23, Nov. 1975, p. 1483-1494.

Physics

Auroral Electrojets, Magnetic Storms, Magnetospheric Instability, Polar Substorms, Atmospheric Models, Diurnal Variations, Magnetic Signatures, Polar Caps

Scientific paper

The time-sequence of polar magnetic substorms is discussed to clarify some controversies over the magnetospheric substorm model, including the growth phase. The main purpose of the analyses is to examine magnetic variations at the polar cap and at low latitudes. Onset of the expansion phase is confirmed to be reasonably defined by a vector change of the polar-cap magnetic disturbance, a sharp intensification of the auroral electrojet disturbance, and the beginning of a positive disturbance at midlatitudes near midnight due to a gradual decrease in magnetic-field strength. It is shown that the growth-phase signatures so far proposed are consistent when onset of the expansion phase is identified from the above-mentioned features.

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