Samsonov, Andrey;
Carter, Jennifer Alyson;
Read, Andrew;
Sembay, Steven;
Branduardi‐Raymont, Graziella;
Sibeck, David;
Escoubet, Philippe;
(2022)
Finding Magnetopause Standoff Distance Using a Soft X-Ray Imager: 1. Magnetospheric Masking.
Journal of Geophysical Research: Space Physics
, 127
(12)
, Article e2022JA030848. 10.1029/2022ja030848.
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Abstract
The magnetopause standoff distance characterizes global magnetospheric compression and deformation in response to changes in the solar wind dynamic pressure and interplanetary magnetic field orientation. We cannot derive this parameter from in-situ spacecraft measurements. However, time-series of the magnetopause standoff distance can be obtained in the near future using observations by soft X-ray imagers. In two companion papers, we describe methods of finding the standoff distance from X-ray images. In Part 1, we present the results of MHD simulations which we use for the calculation of the X-ray emissivity in the magnetosheath and cusps. Some MHD models predict relatively high density in the magnetosphere, larger than observed in the data. Correcting this, we develop magnetospheric masking methods to separate the magnetosphere from the magnetosheath and cusps. We simulate the X-ray emissivity in the magnetosheath for different solar wind conditions and dipole tilts.
| Type: | Article |
|---|---|
| Title: | Finding Magnetopause Standoff Distance Using a Soft X-Ray Imager: 1. Magnetospheric Masking |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1029/2022ja030848 |
| Publisher version: | https://doi.org/10.1029/2022JA030848 |
| Language: | English |
| Additional information: | Copyright © 2022. The Authors. This is an open access article under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits use, distribution and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | Solar wind charge exchange, Soft X-rays |
| 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/10162180 |
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