The lunar wake at 6.8 R<sub>L</sub>: WIND magnetic field observations

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書誌事項

公開日
1996-05-15
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1029/96gl01354
公開者
American Geophysical Union (AGU)

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説明

<jats:p>We report on WIND magnetic field observations at ∼6.8 R<jats:sub>L</jats:sub> downstream of the moon on 27th December 1994. The moon was in the solar wind during the encounter. IMP‐8 observations are used to determine baseline IMF conditions, and therefore determine those features in the WIND data which are related to its proximity to the moon. Previous Explorer 35 observations suggest that the lunar wake is not detectable beyond a downstream distance of ∼4 R<jats:sub>L</jats:sub>. However, despite the distance of WIND from the moon, we observe a slight decrease in field intensity just prior to the spacecraft entering the optical shadow, a slight field strength enhancement whilst in shadow, and perhaps a weak depression once the spacecraft reemerges into sunlight. These signatures closely resemble, but are weaker than, the previous observations. We conclude that a lunar wake did extend to these distances at the time of this encounter. We also note a rotation in field direction some distance outside of the wake signature which may be attributed to the crossing of the lunar mach cone boundary. We discuss the observations in terms of simple models of the solar wind interaction with an insulating body.</jats:p>

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