Palmerio, E;
Kilpua, EKJ;
Möstl, C;
Bothmer, V;
James, AW;
Green, LM;
Isavnin, A;
... Harrison, RA; + view all
(2018)
Coronal Magnetic Structure of Earthbound CMEs and In Situ Comparison.
Space Weather
, 16
(5)
pp. 442-460.
10.1002/2017SW001767.
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Abstract
Predicting the magnetic field within an Earth-directed coronal mass ejection (CME) well before its arrival at Earth is one of the most important issues in space weather research. In this article, we compare the intrinsic flux rope type, that is, the CME orientation and handedness during eruption, with the in situ flux rope type for 20 CME events that have been uniquely linked from Sun to Earth through heliospheric imaging. Our study shows that the intrinsic flux rope type can be estimated for CMEs originating from different source regions using a combination of indirect proxies. We find that only 20% of the events studied match strictly between the intrinsic and in situ flux rope types. The percentage rises to 55% when intermediate cases (where the orientation at the Sun and/or in situ is close to 45°) are considered as a match. We also determine the change in the flux rope tilt angle between the Sun and Earth. For the majority of the cases, the rotation is several tens of degrees, while 35% of the events change by more than 90°. While occasionally the intrinsic flux rope type is a good proxy for the magnetic structure impacting Earth, our study highlights the importance of capturing the CME evolution for space weather forecasting purposes. Moreover, we emphasize that determination of the intrinsic flux rope type is a crucial input for CME forecasting models.
| Type: | Article |
|---|---|
| Title: | Coronal Magnetic Structure of Earthbound CMEs and In Situ Comparison |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/2017SW001767 |
| Publisher version: | https://doi.org/10.1002/2017SW001767 |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | coronal mass ejections, corona, solar wind, magnetic field, flux ropes |
| 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-pp.ucl.ac.uk/id/eprint/10049484 |
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