Abstract
Twelve auroral electron detectors from 300 ev to 30 kev were launched on the Esro S46/2 Skylark rocket from Kiruna, Sweden, on January 28, 1971, at 2120 MLT into an auroral westward-traveling surge. Data show that the low-energy (E ≲, 5 kev) electron precipitation remains relatively stable throughout the flight; it does not seem to be directly related to the luminous intensity. On the other hand, when the rocket goes through the surge, the high-energy (E ≳ 5 kev) precipitation is greatly increased, and the angular distribution of these electrons, which was anisotropic, being maximum at 90° pitch angle, becomes isotropic. The precipitation mechanism of these electrons in the evening sector during the expansion phase of the magnetospheric substorm is probably associated with instabilities occurring near the equatorial plane in this sector.
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