3-Hz Alfvén Wave and Electron Bursts in the Upper Ionosphere During a Substorm Intensification

Details 3-Hz Alfvén Wave and Electron Bursts in the Upper Ionosphere During a Substorm Intensification 3-Hz Alfvén Wave and Electron Bursts in the Upper Ionosphere During a Substorm Intensification

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm21a..04b&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM21A-04

Computer Science

Sound

2407 Auroral Ionosphere (2704), 2736 Magnetosphere/Ionosphere Interactions, 2772 Plasma Waves And Instabilities, 2788 Storms And Substorms

Scientific paper

The GEODESIC auroral sounding rocket encountered two short-lived (several second) bursts of intense Alfvén waves between 800-900 km during a substorm intensification on February 26, 2000. The waves were detected with both vector electric field double probes and a vector flux gate magnetometer and carry a peak Poynting flux of ~1 mW/m2, and are downward-propagating. They have a frequency near 3 Hz and appear to be very coherent, existing within a very narrow bandwidth. They show no sign of reflection from the ionosphere below, and also no sign of direct coupling (density perturbations or particle heating) with the local plasma. The observations are consistent with a horizontal wavelength of order 1 km. The waves were associated with electron acceleration several thousand km above the ionosphere, resulting in velocity-dispersed bursts with energies exceeding 1 keV at times. The higher energies and the detailed shape of the dispersion curves challenge simple, two-fluid models of wave propagation and electron acceleration, and indicate the need for additional physical mechanisms to explain their characteristics. We discuss possible improvements to the models.

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