Astrophysics and Space Science

, Volume 126, Issue 2, pp 313–327 | Cite as

Frame transformation of spherical-harmonic coefficients of differential particle intensity

  • C. K. Ng


We present a general second-order-correct frame transformation on spherical-harmonic coefficients of differential particle intensity. The transformation, valid for relativistic particles as well, provides a clear view of the Compton-Getting effect. It shows explicitly how each transformed harmonic coefficient depends on a subset of the original harmonic coefficients. The general expression for the first-order Compton-Getting vector anisotropy is derived and interpreted. In addition, we show how the new transformation allows one to simplify a current procedure for determining the directional intensity in a comoving frame. This involves the directional particle data measured on a spacecraft.


General Expression Anisotropy Particle Intensity Relativistic Particle Clear View 
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Copyright information

© D. Reidel Publishing Company 1986

Authors and Affiliations

  • C. K. Ng
    • 1
  1. 1.Dept. of MathematicsUniversity of MalayaKuala LumpurMalaysia

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