A new method for accurate ionospheric electron density measurements by incoherent scatter radar

Details A new method for accurate ionospheric electron density measurements by incoherent scatter radar A new method for accurate ionospheric electron density measurements by incoherent scatter radar

Aug 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jgr....89.6841h&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 89, Aug. 1, 1984, p. 6841-6845.

Physics

10

Incoherent Scatter Radar, Ionospheric Electron Density, Radar Measurement, Altitude, Chirp Signals, Density Measurement, Plasma Diagnostics, Plasma Frequencies

Scientific paper

It is shown that the detectability of the plasma line in incoherent scatter radar experiments on the ionospheric plasma can be increased by factors in the range of 10-100 by chirping the transmitter frequency at a rate matching the rate of change of plasma frequency with height. The method is explained in detail, and some initial experiments carried out at the Arecibo Observatory are described. Plasma frequency versus height profiles with an accuracy better than one part in 10,000 were established with 1 sec integration time per point. An example of quasi-periodic oscillation of ionospheric electron density with a period of about 18 min is also shown. The chirped frequency observations will greatly facilitate plasma line studies of photoelectrons, allow for studies of small-amplitude wave-like density perturbations, provide electron density profiles with high time resolution and unprecedented accuracy, make it possible to measure electron temperature independently of ion temperature, and probably allow for observations of vertical currents.

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