Comparison of Field‐Aligned Current Responses to HSS/SIR, Sheath, and Magnetic Cloud Driven Geomagnetic Storms

Autor:	M. N. Pedersen, H. Vanhamäki, A. T. Aikio
Jazyk:	angličtina
Rok vydání:	2023
Předmět:	field‐aligned currents solar wind coupling delay lag geomagnetic storms integration time Geophysics. Cosmic physics QC801-809
Zdroj:	Geophysical Research Letters, Vol 50, Iss 11, Pp n/a-n/a (2023)
Druh dokumentu:	article
ISSN:	1944-8007 0094-8276
DOI:	10.1029/2023GL103151
Popis:	Abstract 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.
Databáze:	Directory of Open Access Journals
Externí odkaz:	https://doaj.org/article/0b0add534d284e01aa26a67a7d7a395e Zobrazit plný text záznamu Plný text View record in DOAJ