Polar Convection Monitoring Determination of the IMF Bz and By Orientations From Digisonde Drift Velocities.
Scientific rept. no 9,
MASSACHUSETTS UNIV LOWELL CENTER FOR ATMOSPHERIC RESEARCH
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Statistics for one year of Digisonde drift velocities recorded at Qaanaaq Greenland are used to derive a method to determine the sign of the interplanetary magnetic field Bz and By components. The Digisonde velocities show characteristics expected from the theoretical understanding of the two cell and four cell convection pattern which can exist at high latitudes when the IMF Bz 0 and Bz 0 respectively. The derived method is able to determine correctly the orientation of the IMF in 60 to 70 of the cases tested. Considering that the method uses only 15 minute drift velocities recorded at one station Qaanaaq, the method shows enormous potential for accurately determining the orientation of the IMF components, and assisting in the mapping of the convection pattern when more data from Digisonde stations are introduced in the analysis.
- Atmospheric Physics