Articles | Volume 33, issue 3
Ann. Geophys., 33, 245–255, 2015

Special issue: Dynamic processes in geospace

Ann. Geophys., 33, 245–255, 2015

Regular paper 03 Mar 2015

Regular paper | 03 Mar 2015

Azimuthal velocity shear within an Earthward fast flow – further evidence for magnetotail untwisting?

T. Pitkänen et al.

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IMF effect on the polar cap contraction and expansion during a period of substorms
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An azimuthal velocity shear with a reversal within an earthward magnetotail fast flow is studied using Cluster observations. In addition, ionospheric SuperDARN data and different magnetospheric models (T96 and TF04) are utilized when interpreting the Cluster observations. Untwisting of twisted tail B field lines is a good candidate to explain the observations.