D-region signatures of substorm growth phase and onset observed by EISCAT |
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Institution: | 1. Bureaus of Microbial Hazards, Health Canada, 251 Sir Frederick Banting Driveway, P.L. 2204E, Ottawa, Ontario, Canada K1A 0K9;2. Nutritional Sciences, Health Canada, 251 Sir Frederick Banting Driveway, P.L. 2204E, Ottawa, Ontario, Canada K1A 0K9 |
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Abstract: | High resolution electron density measurements by EISCAT during the pre-onset phase and onset of an auroral absorption substorm are used to investigate the characteristics of electron precipitation during these substorm phases. The development of the pre-onset phase is the result of a uniform increase of electron fluxes with energies of a few tens of keV, with no particularly hard component. The absorption spike observed at substorm onset contains fine structure when investigated at 10 s resolution, indicating a rapid hardening of the precipitating spectrum at the onset. |
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