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논문

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야간 상부 전리층 밀도 교란 지역의 이온 온도 및 속도 변화: 저위도-중위도 간의 대비
  • 박재흥; 로드릭 힐리스; 조길광;
  • 2021-02-01
  • JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS 126 2 : 1~14
Studies on low-/mid-latitude ionospheric irregularities have a long history, but ion temperature and drift velocity variations within the irregularities have been rarely investigated, especially at mid-latitudes. To fill this knowledge gap, we statistically investigate ion temperature and velocity of mid-latitude ionospheric irregularities and compare them to those of low-latitude ones. This study mainly relies on in-situ plasma moment data from the newly launched ICON satellite and is supplemented by ROCSAT-1 data in 2000-2004. At low latitudes (|MLAT|<10o) plasma density irregularities encountered by ICON have the following properties: lower-density regions have cooler ions and more poleward/westward/outward velocity than the ambient plasma, which agrees with previous reports on equatorial plasma bubbles. At mid-latitudes (|MLAT|=10o~30o), the opposite trends are observed: lower-density regions have hotter ions and more equatorward/eastward/inward drift than the ambient, which is a new finding in this study. The mid-latitude observations can be put into the context of MSTID properties reported previously, which evidences that topside irregularities at nighttime mid-latitudes generally represent MSTIDs. ROCSAT-1 data support the contrast between low- and mid-latitude ionospheric irregularities.