W O

log particle diameter (/¿m)

Figure 1. The terrestrial influx of zodiacal dust particles, as measured from the crater-ing record on the Long Duration Exposure Facility, LDEF.

0 —,—,—,—,-1—,—,—,—,-1—,—,—,—,-1—

heliocentric distance (AU)

0 —,—,—,—,-1—,—,—,—,-1—,—,—,—,-1—

heliocentric distance (AU)

Figure 2. The variation with heliocentric distance of the forced inclination of dust particles in the zodiacal cloud, shown for five different particle diameters.

cles have been out of reach (the dynamical lifetime of a particle in a Poynting-Robertson (P-R) drag dominated system scales with its size [5]). However various evidence, including that of the LDEF cratering record [6], points to the fact that large particles contribute significantly to the zodiacal emission (Figure 1), and these particles need to be taken into account.

Was this article helpful?

0 0

Post a comment