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Radiation belt electron flux dropouts are a kind of drastic variation in the\udEarth's magnetosphere, understanding of which is of both scientific and\udsocietal importance. Using electron flux data from a group of 14 satellites,\udwe report multi-satellite simultaneous observations of magnetopause and\udatmospheric losses of radiation belt electrons during an event of intense\udsolar wind dynamic pressure pulse. When the pulse occurred, magnetopause and\udatmospheric loss could take effect concurrently contributing to the electron\udflux dropout. Losses through the magnetopause were observed to be efficient\udand significant at <i>L</i> ≳ 5, owing to the magnetopause intrusion into <i>L</i> ∼ 6 and outward radial diffusion associated with sharp negative gradient\udin electron phase space density. Losses to the atmosphere were directly\udidentified from the precipitating electron flux observations, for which pitch\udangle scattering by plasma waves could be mainly responsible. While the\udconvection and substorm injections strongly enhanced the energetic electron\udfluxes up to hundreds of keV, they could delay other than avoid the\udoccurrence of electron flux dropout at these energies. It is demonstrated\udthat the pulse-time radiation belt electron flux dropout depends strongly on\udthe specific interplanetary and magnetospheric conditions and that losses\udthrough the magnetopause and to the atmosphere and enhancements of substorm\udinjection play an essential role in combination, which should be incorporated\udas a whole into future simulations for comprehending the nature of radiation\udbelt electron flux dropouts

annales geophysicae

Multi-satellite simultaneous observations of magnetopause and atmospheric losses of radiation belt electrons during an intense solar wind dynamic pressure pulse