Signatures in the dayside aurora of plasma transfer from the magnetosheath

Physics

Scientific paper

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Auroral Zones, Coupled Modes, Earth Magnetosphere, Magnetosheath, Plasma Dynamics, Plasma Interactions, Interplanetary Magnetic Fields, Magnetic Field Configurations, Magnetic Field Reconnection, Photometry, Plasma Jets, Polar Cusps, Solar Wind

Scientific paper

In this study, observations of the polar cusp/dayside oval aurora from Svalbard and simultaneous observations of the nightside aurora from Poker Flat, AK, and the interplanetary magnetic field from satellites are used to identify the ionospheric signatures of plasma transfer from the solar wind to the magnetosphere. The characteristics of motion, spatial scale, time of duration, and repetition frequency of certain dayside auroral forms which occur at the time of large-scale oval expansions (interplanetary magnetic field Bz of less than 0) are observed to be consistent with the expected optical signatures of plasma transfer through the dayside magnetopause boundary layer, associated with flux transfer events. Similarly, more large-scale (time and space) events are tentatively explained by the quasi-steady-state reconnection process.

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