Low-frequency oscillations associated with a polar cap auroral arc - Local spectral density estimation

Details Low-frequency oscillations associated with a polar cap auroral arc - Local spectral density estimation Low-frequency oscillations associated with a polar cap auroral arc - Local spectral density estimation

Mar 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....96.3589w&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 96, March 1, 1991, p. 3589-3600. Navy-supported research.

Computer Science

Sound

1

Auroral Arcs, Electrostatic Waves, F Region, Rocket Sounding, Spectrum Analysis, Collisionless Plasmas, Earth Ionosphere, Electron Density Profiles, Energetic Particles, Ion Cyclotron Radiation

Scientific paper

Enhanced low-frequency electrostatic oscillations measured from a rocket in the high-latitude upper F region during the crossing of a polar cap auroral arc are analyzed using local spectral analysis techniques. The turbulent spectra were reduced from measurements made by Langmuir probes whose orientation remained approximately perpendicular to B throughout the flight. The increased low-frequency turbulence appears at an altitude of 400 km, coincident with electrostatic analyzer indications of increased energetic particle flux. Langmuir probe measurements simultaneously show an increasing temperature and generally decreasing electron density profiles. Electrostatic wave data are analyzed using cross-correlation analysis to determine phase shift; local wave number approximations provide an estimate of the plasma wave spectral density. Theoretical expectations for threshold excitation and growth rates of possible instabilities in a two-component high-latitude F region ionosphere are investigated. The most likely source for the measured oscillations appears to be excitation of a collisionless electrostatic ion cyclotron mode.

Affiliated with

Also associated with

No associations

Rating

Low-frequency oscillations associated with a polar cap auroral arc - Local spectral density estimation 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 Low-frequency oscillations associated with a polar cap auroral arc - Local spectral density estimation, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Low-frequency oscillations associated with a polar cap auroral arc - Local spectral density estimation will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1605803