A 2.2-Hz modulation of auroral electrons imposed at the geomagnetic equator

Details A 2.2-Hz modulation of auroral electrons imposed at the geomagnetic equator A 2.2-Hz modulation of auroral electrons imposed at the geomagnetic equator

Jul 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980natur.286..469l&link_type=abstract

Nature, vol. 286, July 31, 1980, p. 469-471.

Computer Science

Sound

7

Auroras, Electron Precipitation, Geomagnetism, Rocket Sounding, Electron Scattering, Geos 2 Satellite, Hiss, Very Low Frequencies

Scientific paper

The direct observation of 2.2-Hz oscillations in the intensities of 4-25 keV electrons producing a pulsating aurora is reported. Electrons were measured by a Petrel sounding rocket launched from Kiruna, Sweden in conjunction with measurements made by the geomagnetically conjugate GEOS 2 satellite. Measured precipitated energy flux variations only amounted to 3% of the energy flux at pulsation maximum, and thus do not permit the confirmation of particle modulations as the source of optical brightness modulations. The oscillations, like the previously observed 1-20 sec pulsations, are found to exhibit a marked velocity dispersion, implying an equatorial origin for both forms of modulation. A comparison of the rocket results with GEOS 2 measurements indicates VLF hiss emissions to be modulated at a frequency close to that of electron intensity oscillations, however isotropic angular distributions observed suggest that low-frequency micropulsations cannot cause auroral pulsations by modulating whistler-mode wave amplitudes which induce variations in the rate of pitch-angle scattering of electrons from the magnetosphere.

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