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 | Zendy

Yoshikawa I. | Zendy; Yamazaki A. | Zendy; Shiomi K. | Zendy; Yamashita K. | Zendy; Takizawa Y. | Zendy; Nakamura M. | Zendy

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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

Author(s) -

Yoshikawa I.,

Yamazaki A.,

Shiomi K.,

Yamashita K.,

Takizawa Y.,

Nakamura M.

Publication year - 2000

Publication title -

geophysical research letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.007

H-Index - 273

eISSN - 1944-8007

pISSN - 0094-8276

DOI - 10.1029/2000gl000100

Subject(s) - plasma sheet , plasma , magnetosphere , physics , ion , extreme ultraviolet lithography , helium , extreme ultraviolet , planet , astronomy , astrophysics , atomic physics , optics , nuclear physics , laser , quantum mechanics

The first optical measurement of He + ions in the plasma sheet was successful by using the XUV scanner onboard Planet‐B. The intensity of He II (304 Å) was ∼0.02 Rayleigh. This result encourages future imaging missions for the whole magnetosphere by detecting He II (304 Å) emission. This is also a proof of the existence of cold plasmas in the plasma sheet. The existence of cold ions brings a new question: How can they remain cold in the plasma sheet?

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