Magnetic storms in the equatorial belt and in polar regions

1Yaremenko, LN, 1Melnik, G
1S.I. Subbotin Institute of Geophysics of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
Kosm. nauka tehnol. 2004, 10 ;(5-6):106-109
Publication Language: Russian
The features of the Dst-variations in Europe-African and Australian-Far Eastern meridional sectors are considered. An attempt is made to select Dst-part, which is the most approached the field created by the ring current DR, using the 1-min ground magnetometer H-com-ponent measurement data. The substorm contribution is excepted following the difference of the latitude depending on the Dst-varia-tion and the substorm amplitude. It is found that the Dst-variation has more amplitude on the daily earth side, not on the nightly one as it was supposed before. For some storms the positive Dst-variation in the northern Europe are observed. The storm field division on the external and internal parts is achieved by means of the sphere harmonic analysis. In Africa, the internal field part equals about a half of the external part, while in the Australian-Far Eastern region these fields are equal, which points to a high mantle conductivity in the region.
1. Gelberg M. G., Kershengolts S. Z. Auroral disturbances during magnetic-cloud arrivals to the Earth. Geomagnetizm i Aeronomiia, 42 (1), 36—41 (2002) [in Russian].
2. Gelberg M. G., Kershengoltz C. Z., Sharaeva S. V. Interrelation between the classes of corpuscular stream sources on the sun and types of long-duration auroral activities on the Earth. Geomagnetizm i Aeronomiia, 41 (1), 23—32 (2001) [in Russian].
3. Farrugia F. J., et al. Geoeffectiveness of try Wind magnetic clouds: a comparative study. J. Geophys. Res., 103, 17261 — 17278 (1998).