Characteristics of Pc5 activity at high latitudes stations in Antarctica

Hyuck Jin Kwon, Khan Hyuk Kim, Geonhwa Jee, Ho Jin, Hyomin Kim, Jehyuck Shin, Seungah Lee, Jong Woo Kwon, Jeong Han Kim, Changsup Lee, Marc Lessard

Research output: Contribution to journalArticlepeer-review

Abstract

We examined wave activities in the Pc5 frequency band (~2–7 mHz) using the magnetic field data from five Antarctic stations, which are AGO3 (72.5° S Altitude-Adjusted Corrected Geomagnetic latitude), South Pole (SPA, 74.6° S), McMurdo (MCM) and Jang Bogo Station (JBS, 80° S), and Dome C (DMC, 89.1° S), during 2017. Pc5 waves at AGO3 and SPA show characteristics associated with Kelvin-Helmohltz instability on the magnetopause and substorm activities, under closed field lines conditions. The local time and seasonal dependence of Pc5 wave activities at polar cap stations (MCM, JBS, and DMC) are significantly different from those at AGO3 and SPA. These indicate that the generation mechanism of Pc5 activities in the open field line region at polar cap is different from that in the closed field lines. We suggest that polar-cap Pc5 is generated by ionospheric current variations produced by solar dynamo between solar wind plasma and geomagnetic field.

Original languageEnglish (US)
Article number105087
JournalJournal of Atmospheric and Solar-Terrestrial Physics
Volume193
DOIs
StatePublished - Oct 15 2019

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Atmospheric Science
  • Space and Planetary Science

Keywords

  • Antarctic stations
  • Correlation analysis
  • Polar region
  • ULF Pc5 waves
  • Variation of solar wind speed

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