Intensity Distribution of Plasmaspheric Hiss in the Plasmasphere

Details Intensity Distribution of Plasmaspheric Hiss in the Plasmasphere Intensity Distribution of Plasmaspheric Hiss in the Plasmasphere

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm51c0544b&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM51C-0544

Physics

2720 Energetic Particles, Trapped, 2768 Plasmasphere, 2772 Plasma Waves And Instabilities

Scientific paper

Plasmaspheric hiss is an electromagnetic emission in the 10s Hz to ~10 kHz frequency range propagating in the whistler mode that is typically confined within the plasmasphere. Two of the most important aspects about plasmaspheric hiss are its source location and generation mechanism. Generation mechanisms have been proposed both inside and outside the plasmasphere and are still controversial. To investigate the source location, plasma wave intensity maps have been constructed by using three years of plasma wave observations from the Dynamics Explorer and three years from the Imager for Magnetopause-to-Aurora Global Exploration (IMAGE) spacecraft. These intensity maps show the potential source locations or sites where waves are amplified due to particle- wave interactions. In this presentation, we show that the plasmaspheric hiss spectrum can be viewed as having low (10 to 300 Hz), mid (300 Hz to 3.3 kHz), and high frequency (> 3.3 kHz) components. Observations of low-frequency plasmaspheric hiss show that the most intense region is in or near the magnetic equator in the afternoon sector and that the maximum intensity region tends to move from L value of 3 to less than 2 during times of negative Bz. These observations are consistent with particle- wave interactions in or near the magnetic equator. The mid- frequency portion of the hiss spectrum shows the peak- intensity region moves from high latitudes at L= 4 toward the magnetic equator over L = 2 to 3. The longitudinal distribution of the hiss intensity in this frequency range is similar to that of lightning intensity with the peak near late afternoon and the minimum near early morning local times. The near- equatorial minimum at L= 2 - 3 is also consistent with particle- wave interactions in the magnetic equator. At frequencies above 3.3 kHz the maximum intensity shifts to the local evening-post midnight with enhancements along all L shells from 1.8 to 3. Indications are that the cyclotron resonance also operates in this frequency range.

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