Physics
Scientific paper
Mar 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977jgr....82.1163k&link_type=abstract
Journal of Geophysical Research, vol. 82, Mar. 1, 1977, p. 1163-1166.
Physics
Electromagnetic Wave Transmission, Geomagnetic Micropulsations, Very Low Frequencies, Wave Generation, Autocorrelation, Magnetohydrodynamic Waves, Protons, Time Response, Wave Interaction, Whistlers
Scientific paper
During controlled VLF transmission experiments from a site near Anchorage, Alaska (L = 4), Pc 1 micropulsations, which can be associated with the VLF transmission program, were observed by detectors at College, Alaska; Dunedin, New Zealand; and Macquarie Island. The micropulsation event started shortly after the transmitter began sending a simple repetitive pulse program at 6.6 kHz. The program consisted of a 5-s-long pulse transmitted every 30 s. Following the onset of the event a complex sequence of micropulsations appeared between 1.0 and 1.33 Hz. During the simple repetitive program the pulsations recurred every 90 s. The micropulsations began 15 min after satellite 1972-76B, at low altitude in the conjugate region of the transmitter, observed proton fluxes which could be identified on a one-for-one basis with irregularly spaced pulses from the transmitter. Calculations suggest that the 6.6-kHz whistler mode wave and a 1-Hz hydromagnetic wave resonate with protons of the same parallel velocity near L = 4.0. The observations suggest that the micropulsations were stimulated by the VLF transmissions, the protons playing a role in the interaction.
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