Photometric measurement of cold helium ions in the magnetotail by an EUV scanner onboard Planet-B: Evidence of the existence of cold plasmas in the near-Earth plasma sheet

Authors
Yoshikawa, I Yamazaki, A Shiomi, K Yamashita, K Takizawa, Y Nakamura, M
Citation
I. Yoshikawa et al., Photometric measurement of cold helium ions in the magnetotail by an EUV scanner onboard Planet-B: Evidence of the existence of cold plasmas in the near-Earth plasma sheet, GEOPHYS R L, 27(21), 2000, pp. 3567-3570
Citations number
14
Categorie Soggetti
Earth Sciences
Journal title
GEOPHYSICAL RESEARCH LETTERS
ISSN journal
00948276 → ACNP
Volume
27
Issue
21
Year of publication
2000
Pages
3567 - 3570
Database
ISI
SICI code
0094-8276(20001101)27:21<3567:PMOCHI>2.0.ZU;2-Y
Abstract
The first optical measurement of He+ ions in the plasma sheet was successfu l by using the XUV scanner onboard Planet-B. The intensity of He II (304 An gstrom) was similar to0.02 Rayleigh. This result encourages future imaging missions for the whole magnetosphere by detecting He II (304 Angstrom) emis sion. This is also a proof of the existence of cold plasmas in the plasma s heet. The existence of cold ions brings a new question: How can they remain cold in the plasma sheet?