Sovremennye problemy distantsionnogo zondirovaniya Zemli iz kosmosa, 2015, Vol. 12, No. 4, pp. 99-105
Pressure field structure as the Earth passes the interplanetary magnetic field sectors
A.A. Karakhanyan
1 , S.I. Molodykh
1 1 Institute of Solar-Terrestrial Physics SB RAS, Irkutsk, Russia
The interplanetary magnetic field (IMF) sector structure which is one of IMF main properties has an impact on the troposphere conditions during periods of low solar activity. Based on the NCEP/NCAR reanalysis data, we carried out statistical analysis of the spatial structure of 500 hPa isobaric height response to the Earth passing of IMF sectors during periods of low solar and geomagnetic activities for solar cycles 20–24. Statistically significant isobaric height changes are shown to be observed as the Earth passes the magnetic sectors. These changes of isobaric height are spatially inhomogeneous at middle and high latitudes. The spatial structure of isobaric height response to the Earth passing of IMF sectors varies through the year. The intensity of this response is maximal for the Northern Hemisphere in March and April, and for the Southern Hemisphere this is observed in September and October. Seasonal variations in spatial structure of the isobaric height response to the sign of IMF sector are determined by geomagnetic activity level changes in these sectors. Baric response to the sign of magnetic sectors appears to be a small part of the pressure field seasonal variations.
Keywords: atmospheric pressure, isobaric height, IMF sector structure, geomagnetic activity
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