An unexplained 10Ð40 degree shift in the location of some diverse neutral atom 
data at 1 AU

Michael R. Collier, Thomas E. Moore, David Simpson, Aaron Roberts, Adam Szabo, 
Stephen Fuselier, Peter Wurz, Martin A. Lee and Bruce T. Tsurutani


Four different data sets pertaining to the neutral atom environment at 1 AU are
presented and discussed. These data sets include neutral solar wind and
interstellar neutral atom data from IMAGE/LENA, energetic hydrogen atom data
from SOHO/HSTOF and plasma wave data from the magnetometer on ISEE-3.
Surprisingly, these data sets are centered between 262 degrees and 292 degrees
ecliptic longitude, 10Ð40 degrees from the upstream interstellar neutral (ISN)
flow direction at 254 degrees resulting from the motion of the Sun relative to
the local interstellar cloud (LIC). Some possible explanations for this offset,
none of which is completely satisfactory, are discussed.

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Advances in Space Research, 34 (1), 166-171, 2004