Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm11c..03n&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM11C-03
Physics
2407 Auroral Ionosphere (2704), 2451 Particle Acceleration, 2455 Particle Precipitation, 2716 Energetic Particles: Precipitating
Scientific paper
Auroral precipitation can be divided into three broad categories. The mono-energetic peak aurora, in which most of the energy flux occurs in a relatively narrow electron energy range, is perhaps the most studied. Fairly good evidence associates mono-energetic peak aurora (often occurring in misleadingly named "inverted V" events) with quasi-static electric fields. In recent years, better appreciation of wave aurora has arisen. In wave aurora, the electron acceleration is distributed over a range of energies. Finally the direct dumping of plasma sheet electrons and ions produces the diffuse, or unaccelerated aurora. Twenty-two years of DMSP electron and ion data (about 60 satellite years) were surveyed, and each spectrum sorted into one of these three categories. For example, electron precipitation with most of the energy flux in one or two DMSP channels, and with signs of acceleration (energy flux above 10**8 eV/cm2 s str eV) were classified as mono-energetic, whereas if the acceleration occurred in 3 or more channels, it was considered broadband acceleration. Spectra which had neither the signature of broadband nor monoenergetic aurora were treated as diffuse aurora - with both electron and ion contributions included. As a result, we are able for the first time to report on the relative importance of these three types of precipitation over a wide variety of circumstances. The effects of UV insolation are incorporated and discussed. Data is functionally fitted to solar wind conditions rather than being binned into coarse Kp categories.
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