Annales Geophysicae
Annales Geophysicae
ANGEO
Articles | Volume 40, issue 1
Articles | Volume 40, issue 1
https://doi.org/10.5194/angeo-40-151-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/angeo-40-151-2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.
Articles | Volume 40, issue 1
Regular paper
 | 
01 Mar 2022
Regular paper |  | 01 Mar 2022

An investigation into the spectral parameters of ultra-low-frequency (ULF) waves in the polar caps and magnetotail

Nataliya Sergeevna Nosikova, Nadezda Viktorovna Yagova, Lisa Jane Baddeley, Dag Arne Lorentzen, and Dmitriy Anatolyevich Sormakov

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Short summary
This paper presents a study of millihertz magnetic pulsations seen in the magnetosphere and on the Earth under quiet space weather conditions. We found that these fluctuations appear in the magnetosphere as soon as disturbances with the same frequency vanish in the solar wind. The results of this work show the possibility of a substorm developing under absolutely quiet external conditions and allow us to assume that these pulsations represent a substorm preparatory phase.
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