Magnetic pulsation behaviour in the magnetosphere inferred from whistler mode signals

Details Magnetic pulsation behaviour in the magnetosphere inferred from whistler mode signals Magnetic pulsation behaviour in the magnetosphere inferred from whistler mode signals

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977p%26ss...25..957a&link_type=abstract

Planetary and Space Science, vol. 25, Oct. 1977, p. 957-966.

Computer Science

2

Doppler Effect, Earth Magnetosphere, Geomagnetic Micropulsations, Very Low Frequencies, Whistlers, Electric Pulses, Ionospheric Propagation, New Zealand, Washington

Scientific paper

The 18.6 kHz signal from the frequency stabilized transmitter NLK in Seattle propagates in the whistler mode over ionospheric ducts and has been recorded at Wellington, New Zealand. Some of these recordings are characterized by large oscillations in the Doppler shift of the ducted signal, revealing the action of electric fields of micropulsation events in the 3-8-min period region. The Doppler shift oscillations are most simply interpreted if the field-aligned whistler duct was taking part in a standing oscillation. It is shown that the oscillation mode is probably odd with an antinode of motion in the equatorial plane. The VLF records examined provide support to the conjecture that the magnetospheric disturbance vector observed on the ground is rotated 90 deg with respect to its orientation in the magnetosphere. A model of the standing wave in the magnetosphere shows that the azimuthal component of electric field associated with a ground perturbation of about 10 gamma amplitude is approximately 1 mV/m in the equatorial plane at L = 2.5.

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