J. Space Weather Space Clim.
Volume 13, 2023
|Number of page(s)||14|
|Published online||02 June 2023|
Orientation of the stream interface in CIRs
Wigner Research Centre for Physics, Konkoly-Thege Miklos street 29-33, 1121 Budapest, Hungary
2 Eötvös Loránd University, Doctoral School of Physics, Pázmány Péter walkway 1/A, 1117 Budapest, Hungary
* Corresponding author: email@example.com
Accepted: 14 April 2023
Corotating Interaction Regions (CIRs) are complex structures in the Heliosphere that arise from the interaction of fast and slow solar wind streams. The interface between fast and slow solar wind is called the stream interface, which often has considerable north-south tilt. We apply a sliding window correlation method on multi-spacecraft data in order to obtain the time delay between the spacecraft. Using these time delays and in-situ solar wind velocity measurements, we can shift the positions of two spacecraft, and, together with the position of the reference spacecraft, we can reconstruct the spatial orientation of the stream interface. We examined four CIRs from two different solar sources at the beginning of 2007 using ACE, WIND, and STEREO-A spacecraft data. The gradually increasing distance between STEREO-A and the other spacecraft provides an opportunity to determine the effects of spacecraft separation on the quality of the results. In three out of the four events, the determined planes generally follow the Parker spiral in the ecliptic, their off-ecliptic tilt is determined by the position of the source of the high-speed stream. For the fourth event, STEREO-A was probably too far away for this method to be successfully applied.
Key words: Corotating interaction regions / Solar wind
© G. Koban et al., Published by EDP Sciences 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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