Physics
Scientific paper
May 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsm51b..06j&link_type=abstract
American Geophysical Union, Spring Meeting 2005, abstract #SM51B-06
Physics
2431 Ionosphere/Magnetosphere Interactions (2736), 2487 Wave Propagation (6934), 2704 Auroral Phenomena (2407), 7867 Wave/Particle Interactions
Scientific paper
Satellites in the auroral region often detect energetic heavy ion outflows together with electromagnetic ion cylotron wave activity (1-100Hz). Because the Poynting flux of the waves is into the ionosphere, the waves can energize the ions at lower altitude leading to ion outflow from the topside ionosphere. One difficulty with relating the ion outflows to the wave activity is the nonlocality of the heating process---much of the heating occurs between the ionosphere (where the ions originate) and the spacecraft. A common practice is to assume a heating rate based upon the spectrum observed by the satellite. However, nonlocal wave solutions suggest that propagation and dissipation of the wave spectrum depends sensitively on the heavy ion plasma profiles in the topside ionosphere as well as the collisional ionospheric model. Consequently, the heating rate is strongly dependent on the plasma density profile. Because the heating rate determines the plasma profiles and the plasma profiles determine the heating rate, it is necessary to account for the feedback in a self-consistent manner. We successively iterate (1) a wave propagation code based on background plasma profiles (which solves the full electromagnetic equations including a realistic ionospheric model) and (2) a Monte Carlo simulation code to obtain the ion profiles based on heating rates obtained from the results of the wave propagation code. The method converges rapidly to a stable state, and the results suggest that the temporal evolution of the plasma profiles may involve a two-step process where helium is first heated then oxygen.
Cheng C. Z.
Johnson Jay Robert
No associations
LandOfFree
Modeling Ion Outflows Associated with 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 Modeling Ion Outflows Associated with Electromagnetic Ion Cyclotron Waves, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Modeling Ion Outflows Associated with Electromagnetic Ion Cyclotron Waves will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1696862