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- W2017295084 abstract "Controversy still exists regarding even the average convection pattern when the interplanetary magnetic field (IMF) has a northward component. Using two years of convection data from a Digisonde located at Qaanaaq only 3° from the corrected geomagnetic pole we have examined the diurnal convection flow direction variation in the central polar cap when the IMF is particularly stable. We find that when B z is positive, and when B y positive and B y negative data are treated independently, each exhibits a clear diurnal pattern. The patterns are most nearly consistent with a multicell convection model, e.g. Potemra et al. (1984); there are, however, two anomalies. Our synthesized polar cap convection patterns exhibit a polar cap cell centered on 10 corrected geomagnetic local time (CGLT) when B y > 1 nT and 13 CGLT when B y < −1 nT in contrast to 06 and 18 CGLT predicted by the multicell models. Furthermore, in contrast to the simple multicell models the convection flow patterns for opposite B y polarities are not simple mirror images of each other. When B y < −1 nT the convection is directed across the central polar cap toward 02 CGLT for much of the day but when B y > 1 nT the flow is tangential to the Qaanaaq geomagnetic latitude for much of the day." @default.
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- W2017295084 date "1992-11-01" @default.
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- W2017295084 title "Digisonde measurements of polar cap convection for northward interplanetary magnetic field" @default.
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- W2017295084 doi "https://doi.org/10.1029/92ja01190" @default.
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