1 December 1993 Interplanetary He II extreme-ultraviolet observation on PLANET-B
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Japan's spacecraft PLANET-B will be launched to Mars in 1998. An extreme-ultraviolet (EUV) measurement of 30.4-nm wavelength is proposed for an interplanetary He+ observation during the cruising phase from Earth to Mars. This measurement will help our understanding of the creation and loss of interplanetary He+. Another objective is to image the plasmasphere and magnetotail of the Earth. The EUV scanner we have designed for the PLANET-B mission will provide the opportunity to observe both interplanetary and magnetospheric He+. In addition, we describe another improved design of this EUV scanner, which covers wavelengths from 30 to 90 nm. This improved scanner will measure scattered light from helium (58.4 nm) and oxygen ions (83.4 nm) in addition to He II.
Masato Nakamura, Masato Nakamura, Tatsundo Yamamoto, Tatsundo Yamamoto, Koichiro Tsuruda, Koichiro Tsuruda, Yoshifumi Saito, Yoshifumi Saito, Koujun Yamashita, Koujun Yamashita, Akihiro Furuzawa, Akihiro Furuzawa, Toshihiro Ogawa, Toshihiro Ogawa, Supriya Chakrabarti, Supriya Chakrabarti, } "Interplanetary He II extreme-ultraviolet observation on PLANET-B," Optical Engineering 32(12), (1 December 1993). https://doi.org/10.1117/12.155625 . Submission:

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