Correlations of Proton Energy Spectra and EMIC Waves in the Earth's Equatorial Outer Magnetosphere: SCATHA Satellite Results

Details Correlations of Proton Energy Spectra and EMIC Waves in the Earth's Equatorial Outer Magnetosphere: SCATHA Satellite Results Correlations of Proton Energy Spectra and EMIC Waves in the Earth's Equatorial Outer Magnetosphere: SCATHA Satellite Results

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm11b0309n&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM11B-0309

Physics

2752 Mhd Waves And Instabilities (2149, 6050, 7836), 2772 Plasma Waves And Instabilities (2471), 7807 Charged Particle Motion And Acceleration, 7867 Wave/Particle Interactions (2483, 6984)

Scientific paper

A study using 58 days of magnetic field and proton spectra data from the SCATHA (P78-2) satellite has been conducted to evaluate the correlation between electromagnetic ion cyclotron (EMIC) waves and proton fluxes in the Earth's outer magnetosphere. Based on wave power and ellipticity, ɛ, measurements EMIC waves were observed intermittently on 37 days. Among the hundreds of wave occurrences observed, we found no correlations between EMIC waves and proton differential fluxes in the energy bands centered at 0.88, 2.06, 3.60, and 8.80 keV for either parallel or perpendicular components. For energy bands centered at 15.6, 36.0, 71.0, and 133.0 keV there were no correlations between proton parallel differential fluxes and EMIC waves. There were, however, 20 time intervals showing correlations between perpendicular fluxes and EMIC waves. Each of these 20 intervals lasted only several minutes. These intervals were mainly near local noon and in the evening sector. The L values were from 5.6 to 7.5 with magnetic latitudes from -15.6° to 15.4°. The wave frequencies fell in the range 0.16-1.06 Hz, which corresponds to 0.06-0.56 normalized to the local proton gyrofrequency. Nineteen out of 20 had ɛ < 0.0, i.e.,left-hand polarization, and one had ɛ near 0.0, i.e., linear polarization. Linear analysis of the resonant interaction of an individual proton with the observed EMIC waves is consistent with the observed correlations. It would appear that in these rare cases the pitch angle distributions are non-gyrotropic.

Affiliated with

Also associated with

No associations

Rating

Correlations of Proton Energy Spectra and EMIC Waves in the Earth's Equatorial Outer Magnetosphere: SCATHA Satellite Results does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Correlations of Proton Energy Spectra and EMIC Waves in the Earth's Equatorial Outer Magnetosphere: SCATHA Satellite Results, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Correlations of Proton Energy Spectra and EMIC Waves in the Earth's Equatorial Outer Magnetosphere: SCATHA Satellite Results will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-969821