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Statistical study of EMIC Pc1-Pc2 waves observed at subauroral latitudes

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Title
Statistical study of EMIC Pc1-Pc2 waves observed at subauroral latitudes
Other Titles
서브오로라대에서 관측된 EMIC Pc1-Pc2 파동의 통계적 연구
Authors
Kwon, Jong-Woo
Kim, Khan-Hyuk
Jin, Ho
Kwon, Hyuck-Jin
Jee, Geonhwa
Shiokawa, Kazuo
Connors, Martin
Subject
Geochemistry & Geophysics; Meteorology & Atmospheric Sciences
Keywords
Pc1-Pc2 waves; Subauroral latitude; He-band; Plasmapause
Issue Date
2020-09
Citation
Kwon, Jong-Woo, et al. 2020. "Statistical study of EMIC Pc1-Pc2 waves observed at subauroral latitudes". JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS, 205(1): 105292-105301.
Abstract
Although the occurrence rate of electromagnetic ion cyclotron (EMIC) waves is high in the outer magnetosphere (L > 7), it has been suggested in the past that a steep plasma density gradient region of the plasmapause is a preferred location for the generation of EMIC waves. To examine spectral properties of the EMIC waves occurred near the nominal location of the plasmapause (L = 4-5), we focus on Pc1-Pc2 waves observed at subauroral latitude Athabasca station (magnetic latitude: similar to 62 degrees, and L similar to 4.6). A statistical study of 10,494 wave samples identified from Athabasca data for 2007-2008 reveals the following wave characteristics. (1) Wave frequencies are higher in the postmidnight-to-dawn sector and lower in the late afternoon sector. (2) They mostly appear to be in frequency band between helium and oxygen gyrofrequencies (i.e., He-band) calculated from the dipole field model magnetic field intensity at L = 4.6. (3) The occurrence rate of Pc1-Pc2 waves has a peak in the prenoon sector at 0900-1100 LT under quiet geomagnetic conditions (Kp. 1), but is peaked in the afternoon sector under moderate and disturbed geomagnetic conditions (Kp. 2). (4) The Pc1-Pc2 waves observed at Athabasca were composed of a mixture of left-hand, right-hand, and linearly polarized waves. By comparing previous and recent studies with these observations, we suggest that the subauroral latitude Pc1-Pc2 waves are associated with EMIC waves generated near the plasmapause and discuss the EMIC wave properties in a region of cold and dense plasmas containing heavy ions in the inner magnetosphere.
URI
https://repository.kopri.re.kr/handle/201206/11966
DOI
http://dx.doi.org/10.1016/j.jastp.2020.105292
Appears in Collections  
2020-2020, Occurrence of aurora and their correlations with polar upper atmospheric and climate variabilities (20-20) / Jee, Geonhwa (PE20100)
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