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Assessing electron heat flux dropouts as signatures of magnetic field line disconnection from the Sun

Pagel, C; Crooker, NU; Larson, DE; (2005) Assessing electron heat flux dropouts as signatures of magnetic field line disconnection from the Sun. Geophysical Research Letters , 32 (14) , Article L14105. 10.1029/2005GL023043. Green open access

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Abstract

Suprathermal electrons focused along magnetic field lines, called the strahl, carry heat flux away from the Sun. Various factors can cause heat flux dropouts (HFDs), including times when the strahl almost vanishes. HFDs are a necessary but insufficient condition for detecting magnetic flux disconnected from the Sun. To quantitatively assess the fraction of HFDs which might be due to disconnected fields, we use four years of suprathermal electron data from the Wind spacecraft to perform a comprehensive survey of heat flux dropouts with durations greater than an hour. Eliminating periods within interplanetary coronal mass ejections or containing counterstreaming electrons, we find that only ∼10% of HFDs have signatures consistent with disconnected flux.

Type: Article
Title: Assessing electron heat flux dropouts as signatures of magnetic field line disconnection from the Sun
Open access status: An open access version is available from UCL Discovery
DOI: 10.1029/2005GL023043
Publisher version: http://dx.doi.org/10.1029/2005GL023043
Language: English
Additional information: Copyright 2005 by the American Geophysical Union
Keywords: Solar-wind electrons, Plasma, Connection, Spacecraft
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 Mathematics
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Mathematics > Clinical Operational Research Unit
URI: https://discovery.ucl.ac.uk/id/eprint/96620
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