Angular dependent transport of auroral electrons in the upper atmosphere

Details Angular dependent transport of auroral electrons in the upper atmosphere Angular dependent transport of auroral electrons in the upper atmosphere

Jan 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989p%26ss...37..109l&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 37, Jan. 1989, p. 109-129.

Computer Science

Sound

36

Auroral Zones, Electron Distribution, Transport Theory, Upper Atmosphere, Angular Distribution, Backscattering, Elastic Scattering, Electron Energy, Energy Spectra, Rocket Sounding

Scientific paper

The transport of auroral electrons through the upper atmosphere is analyzed. The transport equation is solved using a discrete-ordinate method, including elastic and inelastic scattering of electrons (resulting in changes of pitch angle) and degradation in energy as the electrons penetrate into the atmosphere. The transport equation is solved numerically for the electron intensity as a function of altitude, pitch angle, and energy. In situ measurements of the pitch angle and energy distribution of precipitating electrons over an auroral arc provide boundary conditions for the calculation. Model calculations were carried out with various different phase functions for elastic and inelastic collisions to attempt changing the angular scattering, but the observed pitch angle distributions remain unexplained. It is suggested that mechanisms other than collisional scattering influence the angular distribution of auroral electrons at or below 300 km altitude in the low-energy domain.

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