Substorm Related Resonance Structures in Auroral Optical Observatios

Details Substorm Related Resonance Structures in Auroral Optical Observatios Substorm Related Resonance Structures in Auroral Optical Observatios

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm31c..09w&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM31C-09

Physics

2704 Auroral Phenomena (2407), 2752 Mhd Waves And Instabilities, 2788 Storms And Substorms

Scientific paper

The entire suite of substorm events observed by the CANOPUS meridian scanning photometers for the past ten years has been examined in order to specify the statistical nature of resonance structures observed in the optical data. Several hundred substorms have been identified in the Gillam station and, we have discovered that prior to substorm expansive phase onset, and during recovery phase, luminosity oscillations with distinct frequencies are common (0.8, 1.3, 1.9, 2.5, 4.1 mHz). The Hβ (486.1 nm), 557.7 nm, and 630.0 nm emissions at Gillam were examined for resonance structures. The resonances tend to occur at much lower latitudes for the Hβ than for the luminosity associated with the low energy electrons (630.0 nm). We compare our observations with a theory of MHD coupling to the ionosphere, and discuss possible particle acceleration mechanisms. >http://www.ualberta.ca/~wanliss/fallagu2001.html

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