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Zonal currents in the F region deduced from Swarm constellation measurements
Author(s) -
Lühr Hermann,
Kervalishvili Guram,
Rauberg Jan,
Stolle Claudia
Publication year - 2016
Publication title -
journal of geophysical research: space physics
Language(s) - English
Resource type - Journals
eISSN - 2169-9402
pISSN - 2169-9380
DOI - 10.1002/2015ja022051
Subject(s) - solstice , northern hemisphere , geology , latitude , earth's magnetic field , equator , southern hemisphere , ionosphere , geodesy , geophysics , atmospheric sciences , climatology , physics , magnetic field , quantum mechanics
The Swarm constellation has been used to estimate zonal currents in the topside F region ionosphere at about 500 km. Near‐simultaneous magnetic field measurements from two altitudes but the same meridian are used for the current density calculations. We consider the period 15 February to 23 June 2014 for deriving a full 24 h local time coverage of the latitudinal distribution over ±50° in magnetic latitude. Intervals with close orbital phasing at the two heights are considered, which repeat every 6 days. From such days seven successive orbits are used where the epochs of equator crossings differ by less than 2 min. Deduced current densities are predominantly eastward (about 20 nA/m 2 ) on the dayside and westward (about 10 nA/m 2 ) on the nightside. A number of different drivers contribute to the observed total current. We identified the gravity‐driven eastward current as the most prominent at low latitudes. Eastward currents in the Northern Hemisphere are clearly stronger than in the south. This is attributed to the proximity of our study period to June solstice, when the solar radiation is stronger in the north. In addition, interhemispheric winds from the Northern (summer) to the Southern (winter) Hemisphere contribute. They cause eastward currents in the north and westward in the south. We find a relatively large variability of the zonal currents both in space and time. The standard deviation is at least twice as large as the mean value of current density. This large variability is suggested to be related to gravity wave forcing from below.