IBEX_GRUSI_4 Conclusions for guiding center energy loss in a Parker magnetic field (applicable to scatter-free propagation) Outside Earth's orbit: rsin  >V/  ~1AU  -2V/3r adiabatic cooling Inside Earth's orbit: rsin  <V/  ~1AU dlnp/dt = (1-  2 )/2  lnB/  t-(1+  2 ) (V/2r)(1-cos 4  )  -(1+  2 )(  sin  ) 2 (r/V)  0 as r  0 No adiabatic deceleration near the Sun!—for any nearly scatter-free particle (PUIs or GCRs) Roelof
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