ИСТИНА

There are numerous observations of fast and dense plasma streams, so-called jets, propagating inside the magnetosheath. It was found that large-scale jets with duration of minutes can effectively interact with the dayside magnetopause. The interaction is followed by an increase of auroral electrojet (AE) index by up to 100 nT with a time delay of several minutes. The magnetic disturbances are detected first on the dayside and then propagate toward the night side. The jet-related auroral activity is pronounced during quite geomagnetic conditions and can occur under northward orientation of interplanetary magnetic field. We interpret this phenomenon as a complex result of two effects: localized compression of the magnetopause and penetration of the magnetosheath plasma inside the magnetosphere.