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Small scale dayside magnetospheric convection observed from image magnetometer network data

Kraiński W.

Acta Geophysica Polonica

1999

Vol. 47, nr 2

215-222

An exemplary analysis of a simple, modeled moving ionospheric current structure (ICS) is presented. Computed time series of magnetic field variations for several 'magnetometer stations' beneath the path of moving 'structure' are used to display and interpret the sequences of variation vectors and elements of time-dependent covariance matrices (TCM). Analogical analysis is performed for two cases of real magnetic pulsations recorded on 6 northen magnetometer stations from IMAGE network. The first of these cases reveals quite simple ICS related to a regular dual magnetospheric convection cell passing westward over the network. The other case, however, reveals some elements of more complicated ICS, where the motion of ICS (its part) was eastward over 3 northernmost stations, and ot was westward over 3 southern stations. This case is interpreted as the overlapping and carrying of a transient local disturbance in the magnetosphere with a greater scale and quasi-permanent convection structure in which the plasma moved eastward over northen stations, and westward over southern ones.