Journal
ANNALES GEOPHYSICAE
Volume 26, Issue 9, Pages 2837-2844Publisher
COPERNICUS GESELLSCHAFT MBH
DOI: 10.5194/angeo-26-2837-2008
Keywords
ionosphere; electric fields and currents; ionosphere-magnetosphere interactions; ionospheric irregularities
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Funding
- Finland (SA)
- France (CNRS)
- Germany (MPG)
- Japan (NIPR)
- Norway (NFR)
- Sweden (VR)
- United Kingdom (PPARC)
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Observations by the EISCAT Svalbard radar show that electron temperatures T-e in the cusp electrojet reach up to about 4000 K. The heat is tapped and converted from plasma convection in the near Earth space by a Pedersen current that is carried by electrons due to the presence of irregularities and their demagnetising effect. The heat is transfered to the neutral gas by collisions. In order to enhance T-e to such high temperatures the maximally possible dissipation at 50% demagnetisation must nearly be reached. The effective Pedersen conductances are found to be enhanced by up to 60% compared to classical values. Conductivities and conductances respond significantly to variations of the electric field strength E, and Ohm's law for the ionosphere becomes non-linear for large E.
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