Some mass dependent features of energetic ion conics over the auroral regions

Details Some mass dependent features of energetic ion conics over the auroral regions Some mass dependent features of energetic ion conics over the auroral regions

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985jgr....90.9911c&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 90, Oct. 1, 1985, p. 9911-9916. Research supported by the Lockheed Indepe

Physics

7

Auroral Spectroscopy, Conics, Energetic Particles, Explorer 12 Satellite, Mass Spectrometers, Magnetic Fields, Velocity Distribution

Scientific paper

The S3-3 Lockheed ion mass spectrometer data set contains many examples of ion conics, a few of which have more than one species of ion measurable at energies between 0.5 and 16 keV. These events were examined, and some similarities and some differences were found between characteristics of the different ion components. In each event the ion fluxes peaked at about the same pitch angle for each species. If it can be assumed that the ions were energized primarily normal to the geomagnetic field, then the altitude of the energization process was the same for each species. However, there was no preferred altitude. In five of the events the conics were composed of H(+) and O(+), which were observed to have similar energy distribution functions. These were typically very soft but sometimes exhibited a high-energy tail which extended to above 10 keV. In the event where He(+) was observed, its distribution function was much harder, with substantial fluxes extending up to 16 keV, in marked contrast to the very soft H(+) component of the conic.

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