Interplanetary magnetic field and atmospheric electric circuit influences on ground-level pressure at Vostok

Details Interplanetary magnetic field and atmospheric electric circuit influences on ground-level pressure at Vostok Interplanetary magnetic field and atmospheric electric circuit influences on ground-level pressure at Vostok

Feb 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jgrd..11204103b&link_type=abstract

Journal of Geophysical Research, Volume 112, Issue D4, CiteID D04103

Astronomy and Astrophysics

Astrophysics

9

Atmospheric Processes: Atmospheric Electricity, Solar Physics, Astrophysics, And Astronomy: Solar And Stellar Variability (1650), Atmospheric Processes: Clouds And Cloud Feedbacks

Scientific paper

The Mansurov effect, which for the Southern Hemisphere consists of a positive association between the By component (east-west) of the interplanetary magnetic field (IMF) and the ground-level pressure for stations poleward of ~80° magnetic latitude, is confirmed for Vostok (78.5°S, 106.9°E magnetic latitude 83.6°S) using modern data. The magnitude of the association is small (0.19 hP per nT; 1.2% common covariance) but statistically significant (at the 96.1% level). A more substantial association exists, with a slight delay (2-3 days) and a cumulative influence, between the Vostok station pressure and the local vertical electric field, a proxy for the air-Earth current Jz. A composite series constructed as a weighted sum of vertical electric field values at lags between 1 and 4 days yields a linear regression gradient with respect to Vostok station-level pressure of 0.10 hP per Vm-1, 10.0% common covariance and is statistically significant at the 99.9% level. We confirm a previously reported Sun-weather linkage (the Mansurov effect), provide evidence that the mechanism operates via the atmospheric electric circuit and present data supporting an inferred and more substantial surface pressure response to changes in the global atmospheric circuit.

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