University of Oulu

Pedersen, M. N., Vanhamäki, H., & Aikio, A. T. (2023). Comparison of field-aligned current responses to HSS/SIR, sheath, and magnetic cloud driven geomagnetic storms. Geophysical Research Letters, 50, e2023GL103151.

Comparison of field-aligned current responses to HSS/SIR, sheath, and magnetic cloud driven geomagnetic storms

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Author: Pedersen, M. N.1; Vanhamäki, H.1; Aikio, A. T.1
Organizations: 1Space Physics and Astronomy Research Unit, University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.7 MB)
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Language: English
Published: American Geophysical Union, 2023
Publish Date: 2023-09-25


The time delay from an interplanetary driver arriving at the magnetopause to the response in the ionosphere has never been quantified separately for different types of storm drivers. This study investigates the delay for storms driven by high-speed streams and associated stream interaction regions (HSS/SIR), or by interplanetary coronal mass ejection sheaths and magnetic clouds (MC). The total field-aligned current (FAC) and SME index lag the Newell coupling function (NCF) by 40 ± 10 min during storms driven by HSS/SIR and sheaths, and by 60 ± 10 min for MCs. The correlation coefficient between FAC and NCF reaches maximum value as NCF is averaged over the preceding 80 min for sheath, 90 min for HSS/SIR, and 140 min for MC storms.

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Series: Geophysical research letters
ISSN: 0094-8276
ISSN-E: 1944-8007
ISSN-L: 0094-8276
Volume: 50
Issue: 11
Article number: e2023GL103151
DOI: 10.1029/2023GL103151
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: This work was supported by the Academy of Finland projects 314664 and 348782, and the Vilho, Yrjö and Kalle Väisälä Foundation.
Academy of Finland Grant Number: 314664
Detailed Information: 314664 (Academy of Finland Funding decision)
348782 (Academy of Finland Funding decision)
Copyright information: © 2023. The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.