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1 Acta Geophysica Polonica

1 1998

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Search for ground signatures of transient events at the magnetopause: database and preliminary results

Ivchenko N., Błęcki J.

Acta Geophysica Polonica

1998

Vol. 46, nr 1

89-114

Dayside magnetosphere is the place for various transient events, one class of which-called flux transfer events (FTEs) has been a subject of special importance for almost 20 years. Due to the magnetosphere-ionosphere coupling, phenomena at the dayside magnetopause should have signatures in the high-latitude ionosphere. A search for ground signatures of transient events at the dayside magnetopause is one of the goals of correlated multi-point studies. Ground signatures (if any) can provide additional arguments in the discussion on the nature of transient events. FTEs were chosen for the current study because they are easy to identify and are common in the high-apogee satellite observations. Most of previous studies focused on high-latitude observations themselves, which left the relation of the ionospheric peculiarities to FTEs unproved, if not ambiguous. This work, on the contrary, starts with the magnetopause observations by AMPTE-IRM and UKS satellites. For the events detected, ground magnetometer data are collected, in some cases supplied by AMPTE-CCE data. Observations of some of the events studied are presented. The signatures are discussed in the frame of current theoretical FTE models.