In situ electron density profiles obtained from Arase in the night magnetic local time (MLT) sector and RBSP-B covering all MLTs are used to study small-scale irregularities present plasmasphere near plasmapause. Electron perturbations with amplitudes >10% background time-scales less than 30-min investigated here as irregularities. The statistical survey of is carried out using nearly 2 years d...

[1] The Super Dual Auroral Radar Network (SuperDARN) is a chain of HF radars that monitor plasma dynamics in the ionosphere. In recent years, SuperDARN has expanded to midlatitudes in order to provide enhanced coverage during geomagnetically active periods. A new type of backscatter from F region plasma irregularities with low Doppler velocity has been frequently observed on the nightside durin...

A new approach to the problem of direction and distance ®nding of magnetospheric ULF oscillations is described. It is based on additional information about the structure of geoelectromagnetic ®eld at the Earth's surface which is contained in the known relations of the theory of magnetovariation and magnetotelluric sounding. This allows us to widen the range of diagnostic tools by using observat...

In contrast to the polar aurora visible during geomagnetic storms, stable auroral red (SAR) arcs offer a subvisual manifestation of direct magnetosphere-ionosphere (M-I) coupling at midlatitudes. The SAR arc emission at 6300 Å is driven by field-aligned magnetospheric energy transport from ring current/plasmapause locations into the ionosphere-thermosphere system. The first SAR arc was observed...