Free energy to drive equatorial magnetosonic wave instability at geosynchronous orbit

Details Free energy to drive equatorial magnetosonic wave instability at geosynchronous orbit Free energy to drive equatorial magnetosonic wave instability at geosynchronous orbit

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011jgra..11608220t&link_type=abstract

Journal of Geophysical Research, Volume 116, Issue A8, CiteID A08220

Physics

Magnetospheric Physics: Plasma Sheet, Magnetospheric Physics: Plasma Waves And Instabilities (2471), Magnetospheric Physics: Radiation Belts, Magnetospheric Physics: Ring Current, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions

Scientific paper

The magnetosonic (or ion Bernstein) instability is driven by a positive slope in the ion distribution function perpendicular to the magnetic field at energies above about 1 keV. Fifteen years of multisatellite geosynchronous observations are used to determine the statistical occurrence of ion distributions with positive slopes as a function of energy, local time, geomagnetic activity, and phase of the solar cycle. There is no discernable dependence on phase of the solar cycle, but there are clear dependences on the other parameters. Positive slopes are seen primarily in the energy range between ˜3 and ˜24 keV. The peak occurrence of positive slopes is between midmorning and dusk and moves progressively toward earlier local times for higher energies. The occurrence is significantly greater and extends over a broader local time range for low levels of geomagnetic activity than for high activity, for all energies. At high activity levels, the occurrence tends to be more closely confined near noon. Peak occurrence rates are ˜30% at energies just below 10 keV. A superposed epoch analysis of 77 coronal mass ejection (CME)-driven storms and 93 high-speed solar wind (HSS)-driven storms shows a relative suppression of the occurrence frequency of positive slopes during the recovery phase. The suppression is particularly long-lived for HSS-driven streams.

Affiliated with

Also associated with

No associations

Rating

Free energy to drive equatorial magnetosonic wave instability at geosynchronous orbit 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 Free energy to drive equatorial magnetosonic wave instability at geosynchronous orbit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Free energy to drive equatorial magnetosonic wave instability at geosynchronous orbit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1680674