Rocket observations of auroral Z-mode emissions above and below fpe

Details Rocket observations of auroral Z-mode emissions above and below fpe Rocket observations of auroral Z-mode emissions above and below fpe

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agusmsm43c..06l&link_type=abstract

American Geophysical Union, Spring Meeting 2005, abstract #SM43C-06

Computer Science

Sound

0689 Wave Propagation (4275), 2407 Auroral Ionosphere (2704), 2471 Plasma Waves And Instabilities, 2487 Wave Propagation (6934), 2704 Auroral Phenomena (2407)

Scientific paper

The SIERRA sounding rocket was launched into an active substorm aurora north of Poker Flat, Alaska, on Jan 14, 2002, achieving an apogee of 735 km. Instrumentation included continuous waveform measurements of 100 kHz--5 MHz electric fields detected with a single 6-m double probe antenna which rotated in a plane containing the ambient magnetic field. A host of high frequency plasma waves occurred along the trajectory, including structured whistler mode waves at 250--500 kHz, Langmuir waves, and Z-mode waves both above and below fpe. A particularly striking example of Z-mode waves extending well below fpe occurred during the downleg, 640-690 s into the flight, at altitudes 651-584 km. In this paper, we report the amplitude, frequency range, and polarization (δ E||/ δ E⊥) of these waves inferred from the measurements of electric field using the spinning antenna and investigate the The relation of the signals to the local electron distribution function measured by particle instruments on the payload. Measurements of Z-mode signals well below fpe are somewhat rare at rocket altitudes. We interpret this observation in context of previous low-altitude in-situ wave measurements as well as the possible relation of these Z-mode emissions to MF-burst, a broadband radio emissions observed at ground level at 1-4 MHz.

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