Thermal energization of ions during impulsive field events

Details Thermal energization of ions during impulsive field events Thermal energization of ions during impulsive field events

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17.1061n&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 17, July 1990, p. 1061-1064.

Physics

9

Energetic Particles, Energy Transfer, Ion Cyclotron Radiation, Ion Temperature, Thermal Energy, Thermal Plasmas, Electric Fields, Kinetic Energy, Magnetic Fields, Magnetospheric Ion Density

Scientific paper

In plasmas rapid thermal energization can result when sharp impulses occur within ambient fields. A familiar example of impulsive fields occurs in the ion pick-up mechanism when newly-ionized particles in the presence of ambient electric and magnetic fields suddenly gain substantial gyrational energy. Motions of ions in the presence of a magnetic field can similarly be disrupted by sudden impulsive changes in local electric fields over timescales shorter than the local ion cyclotron period. Impulsive external forces violate adiabatic invariants of motion, abruptly altering the distribution of kinetic energy and providing a mechanism for the transfer of energy from E x B drift into ion gyrational motion. Orbit integration shows order of magnitude increases in the particle thermal energy when the initial gyration speed is small compared to impulsive changes in the drift speed. On average, small random impulses increase the gyration speed, energizing and broadening ion velocity-space distributions. This process will be shown to have an important influence on the outflux of warm ions from the magnetosphere.

Affiliated with

Also associated with

No associations

Rating

Thermal energization of ions during impulsive field events 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 Thermal energization of ions during impulsive field events, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermal energization of ions during impulsive field events will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-1093738