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During magnetically disturbed times, large intensity variations are observed for electrons of energies 50‐ to 150‐keV at the geostationary orbit of the ATS‐1 satellite. Simultaneously, the correlation experiment at the magnetic conjugate region of the satellite has shown that large fluxes of bremsstrahlung X‐rays from precipitated energetic electrons are observed on high‐altitude balloons while magnetic bays are recorded on the ground. The conclusion reached is that the magnetospheric substorm is responsible for the simultaneous intensification of the trapped particle population at 6.6 R e , equatorial plane and of precipitated energetic electrons at the magnetic conjugate region.
Parks et al. (Mon,) studied this question.