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Response of the Ionospheric Convection Pattern to a Rotation of the Interplanetary Magnetic Field on January 14, 1988
Center for Space Sciences, University of Texas at Dallas, Richardson, TX.
1992 (engelsk)Inngår i: Journal of Geophysical Research, ISSN 0148-0227, E-ISSN 2156-2202, Vol. 97, s. 19449-19460Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Ionospheric convection signatures observed over the polar regions are provided by the DMSP F8 satellite. We consider five passes over the southern summer hemisphere during a time when the z component of the interplanetary magnetic field was stable and positive and the y component changed slowly from positive to negative. Large-scale regions of sunward flow are observed at very high latitudes consistent with a strong z component. When B(y) and B(z) are positive, but B(y) is greater than B(z), strong evidence exists for dayside merging in a manner similar to that expected when B(z) is negative. This signature is diminished as B(y) decreases and becomes smaller than B(z) resulting in a four-cell convection pattern displaced toward the sunward side of the dawn-dusk meridian. In this case the sign of B(y) affects the relative sizes of the two highest-latitude cells. In the southern hemisphere the dusk side high-latitude cell is dominant for B(y) positive and the dawnside high-latitude cell is dominant for B(y) negative. The relative importance of possible electric field sources in the low-latitude boundary layer, the dayside cusp, and the lobe all need to be considered to adequately explain the observed evolution of the convection pattern.

sted, utgiver, år, opplag, sider
1992. Vol. 97, s. 19449-19460
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URN: urn:nbn:se:kth:diva-93364DOI: 10.1029/92JA01731OAI: oai:DiVA.org:kth-93364DiVA, id: diva2:515738
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NR 20140805Tilgjengelig fra: 2012-04-15 Laget: 2012-04-15 Sist oppdatert: 2017-12-07bibliografisk kontrollert

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