Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....68..259f&link_type=abstract
Astronomy and Astrophysics, vol. 68, no. 1-2, Aug. 1978, p. 259-264.
Astronomy and Astrophysics
Astrophysics
16
Doppler Effect, Interplanetary Dust, Zodiacal Light, Circular Orbits, Diurnal Variations, Kepler Laws, Kinematics, Orbital Velocity, Particle Motion, Spectroscopic Analysis
Scientific paper
The method developed by Griffin (1967) has been used to measure the wavelength shifts of scattered solar Fraunhofer lines in the zodiacal light, which are caused by the motions of the interplanetary dust particles, as a function of elongation for elongations of 30 to 180 deg. Photoelectric observations of the morning and evening zodiacal-light spectra and photographs of the evening spectrum are analyzed. The results obtained show that: (1) there is a morning-evening asymmetry in the Doppler shifts, such that positive shifts in the morning zodiacal light correspond to negative shifts of the same absolute value in the evening light; (2) the shifts correspond to prograde orbits of the dust particles; (3) the orbital velocities of the dust particles exceed those for circular or elliptical Keplerian orbits; and (4) the orbital velocities are higher than the escape velocities for particles within about 0.7 AU of the sun.
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