Correlation between lambda4278-A optical emissions and a Pc 1 pearl event observed at Siple Station, Antarctica

Journal Article · Sat Mar 01 04:00:00 EST 1980 · J. Geophys. Res.; (United States)

DOI:https://doi.org/10.1029/JA085iA03p01194· OSTI ID:5429181

Mende, S B; Arnoldy, R L; Cahill, Jr, L J; Doolittle, J H; Armstrong, W C; Fraser-Smith, A C

Detailed correlations were observed between the amplitude envelope of Pc 1 pulsations and zenith 4278 N/sub 2//sup +/ intensity at Siple Station, Antarctica, (L=4.2) on August 1, 1977. Conjugate Pc 1 data at Roberval show a similar amplitude envelope and an approximate antiphase relationship. The frequency-time spectrogram of the ULF data shows none of the increasing dispersion associated with bouncing waves; i.e., the Pc 1 pulsation event is a periodic hydromagnetic emission. Analysis of the time delay between the particle-induced optical emission and the wave (42 s) using the ion cyclotron resonance theory shows that the delay is consistent with the resonance of Pc 1 and MeV protons near the northern conjugate of the Siple field line. Alternately, resonance theory using He/sup +/ or O/sup +/ ions as the interacting hot particles does fit the data if the interaction region is off the equator. The intensity of the measured light is higher than that which can be expected from precipitation of ions of normally observed densities.

• Research Organization: Lockheed Palo Alto Research Laboratory, Palo Alto, California 94304
• OSTI ID: 5429181
• Journal Information: J. Geophys. Res.; (United States), Journal Name: J. Geophys. Res.; (United States) Vol. 85:A3; ISSN JGREA
• Country of Publication: United States
• Language: English

Related Subjects

640203* -- Atmospheric Physics-- Magnetospheric Phenomena-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
CHARGED PARTICLES
EARTH ATMOSPHERE
IONS
MAGNETOSPHERE
NITROGEN IONS
PLASMA WAVES
PLASMASPHERE
PULSATIONS
WAVE PROPAGATION