Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995apj...455..677v&link_type=abstract
Astrophysical Journal v.455, p.677
Astronomy and Astrophysics
Astronomy
17
Interplanetary Medium, Infrared: Solar System, Cosmology: Diffuse Radiation
Scientific paper
We present an overview based on IRAS data of the properties of infrared emission from the large-scale component of the interplanetary dust cloud. To assist in separating the smooth component of the interplanetary emission from Galactic emission, discrete sources, and the zodiacal emission bands, and to characterize the properties of the interplanetary emission in compact form, we introduce an empirical function whose adjustable parameters have simple geometrical interpretations. This function is fitted in a lower envelope sense to IRAS scan data; the function represents the data well, with rms residuals at 25 microns of only ˜0.3 MJy sr-1, less than ½% of the peak emission. We use the parameters thus obtained at 12, 25, and 60 microns to produce a simple analytical prescription for the interplanetary dust emission near a solar elongation angle of 90 at any time of year.
The nearly 1 yr duration of the IRAS observations permits the study of time variation of the infrared sky brightness due to the Earth's motion, and of the geometry of the interplanetary dust cloud. We employ our representation of the interplanetary dust emission to examine by several methods the location of a possible surface of symmetry of the interplanetary dust cloud. Discrepancies between these methods, generally consistent with results from other analysis approaches and sometimes other collections of data, indicate that such a surface must have substantial deviations from a plane.
Hauser Michael G.
Vrtilek Jan M.
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