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Frame transformation of spherical-harmonic coefficients of differential particle intensity (1986)

Ng, C. K.

Springer

Astrophysics and space science 126 (1986), S. 313-327

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ISSN: 1572-946X

Source: Springer Online Journal Archives 1860-2000

Topics: Physics

Notes: Abstract 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.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00639383

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