Energy transfer between energetic ring current H(+) and O(+) by electromagnetic ion cyclotron waves

Details Energy transfer between energetic ring current H(+) and O(+) by electromagnetic ion cyclotron waves Energy transfer between energetic ring current H(+) and O(+) by electromagnetic ion cyclotron waves

Sep 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....9917275t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A9, p. 17,275-17,282

Physics

35

Electromagnetism, Energy Transfer, Hydrogen Ions, Ion Cyclotron Radiation, Oxygen Ions, Ring Currents, Emission Spectra, Gyrofrequency, Magnetic Fields, Magnetospheric Instability, Wave Propagation

Scientific paper

Electromagnetic ion cyclotron (EMIC) waves in the frequency range below the helium gyrofrequency can be excited in the equatorial region of the outer magnetosphere by cyclotron resonant instability with anisotropic ring current H(+) ions. As the unducted waves propagate to higher latitudes, the wave normal should become highly inclined to the ambient magnetic field. Under such conditions, wave energy can be absorbed by cyclotron resonant interactions with ambient O(+), leading to ion heating perpendicular to the ambient magnetic field. Resonant wave absorption peaks in the vicinity of the bi-ion frequency and the second harmonic of the O(+) gyrofrequrency. This absorption should mainly occur at latitudes between 10 deg and 30 deg along auroral field lines (L is greater than or equal to 7) in the postnoon sector. The concomitant ion heating perpendicular to the ambient magnetic field can contribute to the isotropization and geomagnetic trapping of collapsed O(+) ion conics (or beams) that originate from a low-altitude ionospheric source region. During geomagnetic storms when the O(+) content of the magnetosphere is significantly enhanced, the absorption of EMIC waves should become more efficient, and it may contribute to the observed acceleration of O(+) ions of ionospheric origin up to ring current energies.

Affiliated with

Also associated with

No associations

Rating

Energy transfer between energetic ring current H(+) and O(+) by electromagnetic ion cyclotron waves 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 Energy transfer between energetic ring current H(+) and O(+) by electromagnetic ion cyclotron waves, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Energy transfer between energetic ring current H(+) and O(+) by electromagnetic ion cyclotron waves will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1791192