ИСТИНА

Here we present the results of study of solar wind diamagnetic structures in-teraction with the Earth magnetosphere. These structures are filaments, which are a part of specific solar wind (SW) sporadic stream. This type of SW streams are de-scribed as minor transients, which produced by prominence eruption. Diamagnetic structures in SW are determined from negative correlation coefficients between so-lar wind density and interplanetary magnetic field modulus, close to 1. To analyze 9 events of various duration (15 – 60 minutes) and intensity (up to maximum intensity AE = 1262 nT), we used multi-satellite measurements in SW and inside the magnetosphere. Also, we used observations of geophysical phe-nomena (variations in geomagnetic field, auroral absorption and auroras on the ob-servatories network, streams of charged particles on geostationary satellites). Ground-based geophysical observations show the development of substorm-like events (SLE), induced by solar wind diamagnetic structure overlapping the magnetosphere without prior energy accumulation in the magnetotail plasma sheet. We present the results of the events analysis, which exhibit modulation of magne-tospheric storminess produced by SW pressure variations. It is shown that due to diamagnetic structure (filament) energy entry, it is not the magnetospheric tail dy-namic processes but the interplanetary magnetic field parameters and SW that di-rectly control the enhancement of auroral electrojet as a part of substorm-like acti-vation.