University of Oulu

Munteanu, C., Hamada, A., & Mursula, K. (2019). High‐speed solar wind streams in 2007‐2008: Turning on the Russell‐McPherron effect. Journal of Geophysical Research: Space Physics, 124, 8913–8927.

High-speed solar wind streams in 2007–2008 : turning on the Russell-McPherron effect

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Author: Munteanu, C.1; Hamada, A.2; Mursula, K.2
Organizations: 1Institute of Space Science, Măgurele, Romania
2ReSoLVE Centre of Excellence, Space Climate Research Unit, University of Oulu, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 22.2 MB)
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Language: English
Published: American Geophysical Union, 2019
Publish Date: 2020-06-26


Two sequences of five high‐speed solar wind stream/corotating interaction region (HSS/CIR) events were observed at 1 AU in December 2007–2008. These two HSS/CIR sequences had opposite magnetic polarities, and they originated from two persistent low‐latitude coronal holes with corresponding polarities. Each HSS/CIR event triggered a geomagnetic storm and strong high‐latitude activity. We follow the evolution of the properties and geomagnetic effects of the two sequences and find that the sequence with negative interplanetary magnetic field polarity (toward sector) develops systematically a more negative Bz(GSM) component and becomes relatively more geoeffective when moving from winter solstice in 2007 to spring equinox in 2008. On the other hand, the sequence with positive polarity (away sector) develops systematically a less negative Bz(GSM) component and becomes relatively less geoeffective. These changes allow the first detailed monitoring of the turning on of the Russell‐McPherron effect when moving from solstice to equinox and the development of the related changes in high‐latitude geomagnetic activity and geomagnetic storms.

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Series: Journal of geophysical research. Space physics
ISSN: 2169-9380
ISSN-E: 2169-9402
ISSN-L: 2169-9380
Volume: 124
Issue: 11
Pages: 8913 - 8927
DOI: 10.1029/2019JA026846
Type of Publication: A1 Journal article – refereed
Field of Science: 115 Astronomy and space science
Funding: We acknowledge the financial support by the Academy of Finland to the ReSoLVE Centre of Excellence (project 307411), and by the Romanian Ministry of National Education (VESS project, number 18PCCDI/2018).
Academy of Finland Grant Number: 307411
Detailed Information: 307411 (Academy of Finland Funding decision)
Copyright information: © 2019. American Geophysical Union. All Rights Reserved.