Balloon observations of nightside Pc 5 quasi-electro-static waves above the South Pole

Details Balloon observations of nightside Pc 5 quasi-electro-static waves above the South Pole Balloon observations of nightside Pc 5 quasi-electro-static waves above the South Pole

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994jgr....99.3879l&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 99, no. A3, p. 3879-3891

Other

6

Antarctic Regions, Electric Fields, Electrostatic Waves, Geomagnetic Micropulsations, Linear Polarization, Night, Power Spectra, Electrostatic Probes, High Altitude Balloons

Scientific paper

We report here a unique Pc 5 band quasi-electrostatic wave event (approximately 300-s period) observed near local geomagnetic midnight at an invariant latitude of 75 deg. The electric field signal was obtained from one of the eight high-latitude balloon payloads launched above the south geographic pole during the South Pole Balloon Campaign in the 1985-86 austral summer. The balloon payloads were instrumented with double-probe electric field detectors and bremsstrahlung X ray detectors. The electric field data from one flight of particular interest have been compared with ground-based magnetometer and micropulsation data in an attempt to understand the nature of the wave event. The Pc 5 waves were linearly polarized in the electric field, the electric field components had amplitudes of 20 to 30 mV/m, and the event persisted for an interval of more than 3 hours from 0000 to 0330 universal time (UT) (2030 to 2400 magnetic local time (MLT)) on December 22, 1985. The magnetic activity was quiet during this time period. Detailed power spectra are presented in the paper. No evidence was found suggesting that the event was produced by an artifact. The event was not associated with atmospheric neutral waves, weather processes, or upward propagating gravity waves. The event was produced in the ionosphere by a process other than the convection of irregularities. We suggest that ultra-low frequency (ULF) magnetosonic waves originating at the magnetopause produced the signals that were observed.

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