Using ULF Waves Artificially Excited by the SPEAR High Power Radar as Diagnostics for Probing the High Latitude Ionospheric Alfven Resonator

Details Using ULF Waves Artificially Excited by the SPEAR High Power Radar as Diagnostics for Probing the High Latitude Ionospheric Alfven Resonator Using ULF Waves Artificially Excited by the SPEAR High Power Radar as Diagnostics for Probing the High Latitude Ionospheric Alfven Resonator

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsa11a0291w&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SA11A-0291

Physics

2403 Active Experiments, 2431 Ionosphere/Magnetosphere Interactions (2736), 2451 Particle Acceleration

Scientific paper

The SPEAR high power radar facility located in the vicinity of Longyearbyen on Spitsbergen has been utilised to artificially excite ULF waves through the modulated heating of the Polar electrojet. The high power radar beam interacts with the plasma in the D- and E-regions leading to oscillations in the local conductivity. This leads to the radiation of Alfven waves along field lines into the magnetosphere. It has been shown that a narrow flux tube can be tagged by the presence of these waves and field aligned plasma acceleration caused by the complex interaction of the artificial ULF waves with the upper boundary of the ionospheric Alfven resonator (IAR). Recent experiments with SPEAR have focussed on investigating the IAR, which acts a resonant cavity partially trapping ULF waves. These techniques are designed to stimulate one of the resonant harmonics of this cavity in order to improve the efficiency of the process which causes the electron acceleration at the upper boundary of the IAR. This interaction may be fundamentally important to the natural formation of aurora. Measurements of the SPEAR-induced ULF waves made by a set of induction coil magnetometers newly deployed on Spitsbergen will be presented. The observations will be discussed in the context of the ionospheric conditions required for the heating process to successfully excite ULF waves and the nature of the IAR cavity on these occasions.

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