Abstract
All substorm disturbances observed in polar latitudes can be divided into two types: polar, which are observable at geomagnetic latitudes higher than 70° in the absence of substorms below 70°, and high latitude substorms, which travel from auroral (<70°) to polar (>70°) geomagnetic latitudes. The aim of this study is to compare conditions in the IMF and solar wind, under which these two types of substorms are observable on the basis of data from meridional chain of magnetometers IMAGE and OMNI database for 1995, 2000, and 2006–2011. In total, 105 polar and 55 high latitude substorms were studied. It is shown that polar substorms are observable at a low velocity of solar wind after propagation of a high-speed recurrent stream during the late recovery phase of a magnetic storm. High latitude substorms, in contrast, are observable with a high velocity of solar wind, increased values of the Bz component of the IMF, the Ey component of the electric field, and solar wind temperature and pressure, when a high-speed recurrent stream passes by the Earth.
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Original Russian Text © I.V. Despirak, A.A. Lyubchich, N.G. Kleimenova, 2014, published in Geomagnetizm i Aeronomiya, 2014, Vol. 54, No. 5, pp. 619–626.
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Despirak, I.V., Lyubchich, A.A. & Kleimenova, N.G. Polar and high latitude substorms and solar wind conditions. Geomagn. Aeron. 54, 575–582 (2014). https://doi.org/10.1134/S0016793214050041
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DOI: https://doi.org/10.1134/S0016793214050041