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Pc1/EMIC waves observed at subauroral latitude during sudden magnetospheric compressions
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  • Pc1/EMIC waves observed at subauroral latitude during sudden magnetospheric compressions
  • Pc1/EMIC waves observed at subauroral latitude during sudden magnetospheric compressions
저자명
김관혁,이동훈,권혁진,이은상,Kim. Khan-Hyuk,Shiokawa. Kazuo,Lee. Dong-Hun,Kwon. Hyuck-Jin,Lee. Ensang
간행물명
천문학회보
권/호정보
2012년|37권 2호|pp.117-117 (1 pages)
발행정보
한국천문학회
파일정보
정기간행물|ENG|
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이 논문은 한국과학기술정보연구원과 논문 연계를 통해 무료로 제공되는 원문입니다.
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기타언어초록

It is generally accepted that sudden compressions of the magnetosphere cause electromagnetic ion cyclotron (EMIC) wave growth by increasing the proton temperature anisotropy. These compression-associated EMIC waves are expected to be on higher latitudes (i.e., higher-L regions close to the magnetopause). In this study we examine Pc1 pulsations, which are believed to be generated by the EMIC instability, observed at subauroral latitude near the nominal plasmapause when the magnetosphere is suddenly compressed by solar wind dynamic pressure variations, using induction magnetometer data obtained from Athabasca, Canada (geomagnetic latitude = 61.7 N, L ~ 4.5). We identified 9 compression-associated Pc1 waves with frequencies of ~0.5-2.0 Hz. The wave activity appears in the horizontal H (positive north) and D (positive eastward) components. All of events show low coherence between H and D components. This indicates that the Pc1 pulsations in H and D oscillate with a different frequency. Thus, we cannot determine the polarization state of the waves. We will discuss the occurrence location of compression-associated Pc1 pulsations, their spectral structure, and wave properties.