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Regularities of the IMF Sector Structure in the Last 170 Years

Published online by Cambridge University Press:  24 July 2018

Mikhail V. Vokhmyanin Open the ORCID record for Mikhail V. Vokhmyanin [Opens in a new window] ,
Nadezhda V. Zolotova  and
Dmitry I. Ponyavin
Mikhail V. Vokhmyanin
Affiliation:
St. Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034Russia email: [email protected]; [email protected]
Nadezhda V. Zolotova
Affiliation:
St. Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034Russia email: [email protected]; [email protected]
Dmitry I. Ponyavin
Affiliation:
St. Petersburg State University, 7/9 Universitetskaya nab., St. Petersburg, 199034Russia email: [email protected]; [email protected]
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Abstract

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The interplanetary magnetic field (IMF) controls magnetospheric currents which cause variations of the ground-based magnetic field. Regular magnetic observations made in the 19th century allow us to infer daily IMF polarities back to 1844. The results coincide with satellite data in about 79% days. Moreover, for the most part of the 19th and 20th centuries, proxies obtained from various geomagnetic data (Helsinki, Saint-Petersburg, Potsdam, and Ekaterinburg) show the same patterns. This suggests that the reliability of the proxies is sufficient to study the IMF in the past. The large-scale organization of the IMF polarities, the so-called sector structure, reveals semi-centennial north-south displacements of the heliospheric current sheet (HCS).

Keywords

Sun: magnetic fieldssolar windevolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S335: Space Weather of the Heliosphere: Processes and Forecasts , July 2017 , pp. 208 - 210
Copyright
Copyright © International Astronomical Union 2018 

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