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Magnetic local time dependency on cusp ion velocity dispersions in the mid-altitude cusp

Krauklis, I; Coates, AJ; Peterson, WK; (2001) Magnetic local time dependency on cusp ion velocity dispersions in the mid-altitude cusp. Geophysical Research Letters , 28 (21) 4057 - 4060. 10.1029/2001GL013061. Green open access

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Abstract

Observations of cusp ion velocity dispersions made by the TIMAS instrument on the Polar spacecraft in the mid-altitude cusp during intervals of northward interplanetary magnetic field (IMF) reveal a clear ordering with magnetic local time (MLT). Between 1100 and 1300 MLT the injected ion velocity increased with invariant latitude for 78% of the cusp crossings, between 0900 and 1100 MLT this percentage reduced to 35% and between 1300 and 1500 MLT the percentage reduced to 57%. In contrast similar observations made during intervals of southward IMF revealed no MLT dependency. Between 0900 and 1500 MLT the injected ion velocity increased with invariant latitude for only 17% of the observed cusp crossings. We suggest that the difference in the MLT dependency between northward and southward IMF can be best explained by the different characteristics of polar convection patterns for sub-solar and lobe reconnection.

Type: Article
Title: Magnetic local time dependency on cusp ion velocity dispersions in the mid-altitude cusp
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/2001GL013061
Publisher version: http://dx.doi.org/10.1029/2001GL013061
Language: English
Additional information: Copyright 2001 by the American Geophysical Union
Keywords: Ionospheric multicell convection, Field, Signatures, Patterns, Region, Viking
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/81810
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