2012
DOI: 10.5194/ars-10-299-2012
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Numerical modeling of solar wind influences on the dynamics of the high-latitude upper atmosphere

Abstract: Abstract. Neutral thermospheric wind patterns at high latitudes obtained from cross-track acceleration measurements of the CHAMP satellite above both polar regions are used to deduce statistical neutral wind vorticity distributions and were analyzed in their dependence on the Interplanetary Magnetic Field (IMF). The average pattern confirms the large duskside anticyclonic vortex seen in the average wind pattern and reveals a positive (cyclonic) vorticity on the dawnside, which is almost equal in magnitude to t… Show more

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Cited by 6 publications
(9 citation statements)
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References 50 publications
(89 reference statements)
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“…The observed north‐south differences for both the minimum and maximum vorticity in this model interval of less than 10% are in obvious contrast to the ∼30% difference for CHAMP 2002/2003 [ Förster et al , , ]. Given the relationship between the vorticity magnitudes and solar activity, it is reasonable to assume that the NH‐SH vorticity differences are also affected by solar activity.…”
Section: Discussionmentioning
confidence: 63%
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“…The observed north‐south differences for both the minimum and maximum vorticity in this model interval of less than 10% are in obvious contrast to the ∼30% difference for CHAMP 2002/2003 [ Förster et al , , ]. Given the relationship between the vorticity magnitudes and solar activity, it is reasonable to assume that the NH‐SH vorticity differences are also affected by solar activity.…”
Section: Discussionmentioning
confidence: 63%
“…The IGRF model results (full lines, compare Table , lower part) for the NH (blue) and SH (red) are compared with corresponding results of two CHAMP data sets: from low solar activity in 2006–2008 (dashed lines, cf. Table , lower part) and from the high solar activity years 2002–2003 (dash‐dotted lines, Förster et al [, Table ]).…”
Section: Model Resultsmentioning
confidence: 99%
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“…Moreover, the anti-sunward wind vortex increases on the dusk side in the Northern Hemisphere for the positive IMF B y component. The results of Förster et al (2008Förster et al ( , 2012 show the close control of plasma dynamics on the high-latitude neutral winds. As expected, the described features have similar characters in the Southern Hemisphere, but opposite dependence on the IMF B y component.…”
Section: Introductionmentioning
confidence: 74%
“…This paper continues prior studies on high‐latitude upper atmosphere phenomena as carried out, for example, by Förster et al . [, , ] and Namgaladze et al . [].…”
Section: Introductionmentioning
confidence: 99%