Auroral electrojets during deep solar minimum at the end of solar cycle 23

Details Auroral electrojets during deep solar minimum at the end of solar cycle 23 Auroral electrojets during deep solar minimum at the end of solar cycle 23

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsh14a..07p&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SH14A-07

Astronomy and Astrophysics

Astrophysics

[2784] Magnetospheric Physics / Solar Wind/Magnetosphere Interactions, [7536] Solar Physics, Astrophysics, And Astronomy / Solar Activity Cycle

Scientific paper

The current solar minimum has continued for over two years of very low-level solar activity. The long-term quieting shows its effects also in the magnetosphere - ionosphere system: the general the level of geomagnetic activity has been very low, and consequently also the auroral electrojets have been weaker and at higher latitudes than usual. The IMAGE magnetometer chain has provided magnetic field measurements since 1982 from a latitudinal chain covering latitudes from Southern Finland to Svalbard, or from 60 to 80 degrees. Thus, the time series covers over two solar cycles of measurements that allow us to determine the electrojet location and intensity during local midnight without bias caused by station location away from the electrojet latitude. In this presentation we compare the auroral electrojet location and intensity during the current solar minimum with those recorded during the previous minimum in 1996-1997. We also investigate whether the long solar quiet period has an effect on the long-term trends in the electrojet observations. The results are used to discuss the “ground state” of the magnetosphere - ionosphere coupling.

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