Correlations between AKR with Auroral Dynamics and Dipole Tilt Angle

Details Correlations between AKR with Auroral Dynamics and Dipole Tilt Angle Correlations between AKR with Auroral Dynamics and Dipole Tilt Angle

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm72b0628g&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM72B-0628

Physics

2704 Auroral Phenomena (2407), 2716 Energetic Particles, Precipitating, 2730 Magnetosphere: Inner, 2772 Plasma Waves And Instabilities, 2788 Storms And Substorms

Scientific paper

The Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) spacecraft is well suited to make unique observations of the aurora and auroral kilometric radiation (AKR) during substorms. Simultaneous data from the Radio Plasma Imager (RPI) instrument and the Far Ultraviolet (FUV) instrument on the IMAGE satellite will be used to correlate features in the AKR spectrum with substorm onset and dipole tilt angle. The RPI observations used in this study are primarily from passive wave measurements. The AKR spectrum typically shows a single peak in intensity around 180 kHz, however, recent measurements by RPI show that a second peak at higher frequencies (near 300 kHz) in the emission spectrum can occur simultaneously with the primary peak AKR at lower frequency. This higher frequency portion of the AKR emission spectrum does not appear be a harmonic of the primary component. Surprisingly, from a year's worth of IMAGE/RPI data it is found that most of the double-peaked spectra of AKR are observed under positive dipole tilt angle conditions. FUV observations of the aurora are used during the times when IMAGE is at apogee and well situated in the AKR emission cone. At these locations FUV can observe the location and intensity of the aurora over the entire auroral oval. Specific substorms will be examined for onset timing and location and related to the occurrences of the single- and double-peaked AKR emissions in an effort to understand the source location of the emissions and the implications of the double-peaked emission in substorm dynamics.

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