OEDIPUS-C topside sounding of a structured auroral E region

Details OEDIPUS-C topside sounding of a structured auroral E region OEDIPUS-C topside sounding of a structured auroral E region

Jan 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000jgr...105..193p&link_type=abstract

Journal of Geophysical Research, Volume 105, Issue A1, p. 193-204

Computer Science

Sound

8

Ionosphere: Active Experiments, Ionosphere: Auroral Ionosphere, Ionosphere: Topside Ionosphere, Radio Science: Ionospheric Propagation

Scientific paper

The Observations of Electric-field Distributions in the Ionospheric Plasma-A Unique Strategy C (OEDIPUS-C) rocket payload was launched from Poker Flat, Alaska, into an evening aurora at 0638 UT, on November 7, 1995. The payload included a tethered HF transmitter-receiver pair which acted as a topside sounder. The bistatic (two-point) configuration allowed an in situ calibration of the radiated power. The conditions in the magnetosphere and ionosphere during the experiment were monitored by a ground based network of instruments and by instruments on the GOES 7 satellite in a geosynchronous orbit. In this paper we present results of the data analysis of topside ionograms that were obtained during the down-leg flight of OEDIPUS-C (OC). The relatively low altitudes through which OC carried out topside sounding make the resulting ionograms a novel data set. Ionospheric reflections of the 10-W transmissions were detected at payload heights between 780 and 160 km on the down leg. Near apogee at 824 km, extremely low electron densities (~100 cm-3) were observed. The monotonic rise in electron density at the payload from apogee to reentry clearly showed that there was no ionospheric F layer peak. The topside-sounding echoes came from all heights between the payload and the E layer peak around 100 km altitude. Strong X-mode ionospheric reflections plus strong O-mode ground reflections were observed. OC thus has provided a close-hand view of a thick, highly structured, auroral E layer sounded at small ranges. The RF signal was efficiently guided along the magnetic field aligned density depletions that were located at the equatorward edges of auroral arcs. Large pulse-to-pulse variations in the amplitude of the ionospheric reflection are not explained by ducting in the geometric-optics sense.

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