Electron intensities over two auroral arcs

Details Electron intensities over two auroral arcs Electron intensities over two auroral arcs

Feb 1973

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1973p%26ss...21..165b&link_type=abstract

Planetary and Space Science, Volume 21, Issue 2, p. 165-165.

Physics

7

Scientific paper

The paper discusses electron intensities observed on two rocket flights over auroral arcs. On both occasions there was an order-of-magnitude increase in the electron phase-space density as the rocket moved northwards across the arc from a southern region of relatively hard precipitation to an adjacent northern region of softer (but still intense) precipitation. These two distinct regions formed northern and southern `curtains' to the arcs. Electrons observed to the south of one of the arcs had the same phase-space density as those in the southern curtain of the arc. It is concluded that the electrons producing the auroral arcs were accelerated at the boundary between two source plasmas in the magnetosphere. The possible identity of the source plasmas is discussed. From the various types of election energy spectra encountered it is suggested that time-varying magnetic fields played an important part in the acceleration of the electrons that produced the auroral arcs.

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