Statistical study of high-latitude E-region Doppler spectra obtained with the SHERPA HF radar

Details Statistical study of high-latitude E-region Doppler spectra obtained with the SHERPA HF radar Statistical study of high-latitude E-region Doppler spectra obtained with the SHERPA HF radar

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991angeo...9..273h&link_type=abstract

Annales Geophysicae (ISSN 0939-4176), vol. 9, April 1991, p. 273-285. Research supported by DRET and USAF.

Computer Science

Sound

34

Doppler Radar, E Region, Ionospheric Sounding, Radar Measurement, Statistical Analysis, Auroral Electrojets, Energy Spectra, Field Aligned Currents, High Frequencies

Scientific paper

A large number of Doppler spectra obtained at six HF frequencies in the E region with the SHERPA HF radar are analyzed statistically. They are characterized by their total power, their mean velocity and their spectral width. The observations cover geomagnetic conditions varying from quiet to disturbed. Due to the location of the auroral oval relative to the radar field of view, echoes are preferentially detected in the morning westward electrojet, with radial velocities away from the radar. This results in an asymmetrical velocity distribution. Both usual Type 1 and Type 2 Doppler spectra, associated with two-stream and gradient-drift waves, respectively, are at the origin of the two peaks in the distribution. Other spectral types do not appear in the statistics. Spectral widths remain narrow for both types. This is explained by a longer lifetime of wave trains compared to higher frequency waves detected by VHF radars. A decrease of the Doppler velocity with radar frequency is related to gradient effects on threshold, as predicted by the linear dispersion equation for the two-stream instability.

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