Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/13027
Authors: | Marzocchetti, Martina* Lepidi, Stefania* Francia, Patrizia* Cafarella, Lili* Di Mauro, Domenico* |
Title: | The longitudinal polar cusp displacement from geomagnetic measurements in Antarctica | Journal: | Annals of Geophysics | Series/Report no.: | 4/62 (2019) | Issue Date: | 2019 | DOI: | 10.4401/ag-7779 | Keywords: | magnetosphere polar cusp |
Subject Classification: | 01.03. Magnetosphere | Abstract: | We used ULF geomagnetic field measurements in the Pc5 frequency range (1.7−7 mHz) at two Antarctic stations to statistically investigate the longitudinal location of the polar cusp. The two stations are located at the same geomagnetic latitude, ~80° S (just poleward of the cusp), and are separated by one hour in magnetic local time. Since at each station the Pc5 power maximizes when the station approaches the cusp, the comparison between their Pc5 power allows to estimate the longitudinal position of the cusp and to examine its movements. We found that there is a displacement of the cusp depending on interplanetary conditions; in particular, the cusp shifts to later hours for negative values of the interplanetary magnetic field and solar wind velocity east−west components (By and Vy), while moves to earlier hours for positive values of Vy. Conversely, no dependence of the cusp longitudinal position on positive By values nor on the interplanetary magnetic field north−south component (Bz) emerges. |
Appears in Collections: | Article published / in press |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Annals2019Marzocchetti CuspDisplacement.pdf | 2.08 MB | Adobe PDF | View/Open |
WEB OF SCIENCETM
Citations
1
checked on Feb 10, 2021
Page view(s)
388
checked on Apr 20, 2024
Download(s)
9
checked on Apr 20, 2024