Fazakerley, AN;
Harra, LK;
van Driel-Gesztelyi, L;
(2016)
An investigation of the sources of Earth-directed solar wind during Carrington Rotation 2053.
The Astrophysical Journal
, 823
(2)
, Article 145. 10.3847/0004-637X/823/2/145.
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Abstract
In this work we analyze multiple sources of solar wind through a full Carrington Rotation (CR 2053) by analyzing the solar data through spectroscopic observations of the plasma upflow regions and the in situ data of the wind itself. Following earlier authors, we link solar and in situ observations by a combination of ballistic backmapping and potential-field source-surface modeling. We find three sources of fast solar wind that are low-latitude coronal holes. The coronal holes do not produce a steady fast wind, but rather a wind with rapid fluctuations. The coronal spectroscopic data from Hinode's Extreme Ultraviolet Imaging Spectrometer show a mixture of upflow and downflow regions highlighting the complexity of the coronal hole, with the upflows being dominant. There is a mix of open and multi-scale closed magnetic fields in this region whose (interchange) reconnections are consistent with the up- and downflows they generate being viewed through an optically thin corona, and with the strahl directions and freeze-in temperatures found in in situ data. At the boundary of slow and fast wind streams there are three short periods of enhanced-velocity solar wind, which we term intermediate based on their in situ characteristics. These are related to active regions that are located beside coronal holes. The active regions have different magnetic configurations, from bipolar through tripolar to quadrupolar, and we discuss the mechanisms to produce this intermediate wind, and the important role that the open field of coronal holes adjacent to closed-field active regions plays in the process.
| Type: | Article |
|---|---|
| Title: | An investigation of the sources of Earth-directed solar wind during Carrington Rotation 2053 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.3847/0004-637X/823/2/145 |
| Publisher version: | http://dx.doi.org/10.3847/0004-637X/823/2/145 |
| Language: | English |
| Additional information: | Copyright © 2016 The American Astronomical Society. All rights reserved. |
| Keywords: | magnetic reconnection; solar wind; Sun: abundances; Sun: corona |
| UCL classification: | UCL 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/1498664 |
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