Radial Velocities In The Zodiacal Dust Cloud

STREAM and CONVL (Zodiacal Dust Cloud)

Program STREAM Calculating Doppler shifts from a uniform dust flow model Program CONVL Simulation of signal output of scanning Fabry-Perot spectrometer The program reads into an array A(2001-4001) a spectrum at relatively high resolution, at 1/50th angstrom intervals. It then places in an array B(2001-4001) values of the interference filter transmission over the corresponding wavelength […]

Hicks and Reay NATURE paper 1972 (Zodiacal Dust Cloud)

MgI Emission in the Night Sky Spectrum During September, October 1971 and April 1972 we observed a narrow region of the night sky spectrum in the vicinity of the 5183.62 A MgI wavelength. Measurements were made with a scanning Fabry-Perot interferometer1,2 from the observatory at Izana on Tenerife, Canary Islands, and consisted of spectral scans […]

Hicks and Reay MNRAS paper 1974 (Zodiacal Dust Cloud) Part 1

AN INVESTIGATION OF THE MOTION OF ZODIACAL DUST PARTICLES—I Summary An experiment to record the spectrum of the Zodiacal Light in the neighbourhood of the MgI absorption line (5183’6 A) is described. Measurements were made of the Doppler shift imposed on the absorption line by the motion of the interplanetary dust particles. Observations were concentrated […]

Hicks and Reay MNRAS paper 1974 (Zodiacal Dust Cloud) Part 2

Discussion The data for the two observing periods appear generally consistent in that both sets show negative and positive radial velocity maxima in the morning and evening respectively. Detailed differences occur however which are best illustrated by reference to Fig. 5, which shows third order polynomial fits to both sets of data. A distinct morning-evening […]

Derivation of the Airy Summation for a Fabry-Perot Interferometer (Zodiacal Dust Cloud)

The diagram shows two rays emerging from the Fabry-Perot, one of which, To, passes through the etalon without reflections, and the other, T[, is reflected twice by the coatings, before emerging. The refractive index of the medium between the plates is n, and that of the medium outside the gap is no. In our case […]