Rocket Measurements of Polarization of Auroral HF Waves

Details Rocket Measurements of Polarization of Auroral HF Waves Rocket Measurements of Polarization of Auroral HF Waves

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002agufmsm21b0540s&link_type=abstract

American Geophysical Union, Fall Meeting 2002, abstract #SM21B-0540

Computer Science

Sound

2407 Auroral Ionosphere (2704), 2471 Plasma Waves And Instabilities, 2487 Wave Propagation (6934), 2704 Auroral Phenomena (2407), 2772 Plasma Waves And Instabilities

Scientific paper

On 6 February 2002, at 9:38:51 UT the Rocket Auroral Correlator Experiment (RACE) sounding rocket was launched into active aurora from Poker Flat, Alaska. The payload reached an apogee of 922km at approximately 550 seconds. One objective of this rocket mission is the measurement of approximate polarization (right vs. left) of observed transverse HF waves. Determining this polarization allows us to identify the wave mode and hence use observed wave cutoffs to measure electron density. The signals from perpendicular antennas in the x-y plane are electronically shifted by +/- 45 degrees using an analog phase shifting circuit which provides a 90 degree phase difference in the frequency range 100kHz-2.4MHz, and the difference and sum of these two signals is taken. The relative amplitudes of these two signals indicate the direction and degree of polarization. The advantage of this technique is that it allows phase information from all frequencies of interest to be transmitted to the ground station using telemetry channels that have amplitude fidelity only, not phase fidelity. In addition to an artificially injected calibration signal the whislter mode, known to be R-mode, will be used as a calibration. Polarization of the other modes will be measured and interpreted. Preliminary analysis of the data reveals Langmuir waves at the plasma frequency, whistler mode emissions and emissions of a to be determined mode (L or X) with a cutoff near the plasma frequency.

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