Midcourse Space Experiment Mid-Infrared Measurements of the Thermal Emission from the Zodiacal Dust Cloud

Astronomy and Astrophysics – Astronomy

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Interplanetary Medium

Scientific paper

The Midcourse Space Experiment (MSX) sampled the mid-infrared thermal emission from the zodiacal dust cloud in spectral bands centered at 8.3, 12, 15, and 21 μm with a variety of experiments during a 9 month period in 1996. Seventy ecliptic latitude profiles were measured between Sun-centered longitudes of 98° and 335°, and a single longitudinal scan was obtained along the ecliptic plane between 160° and 330° solar elongations. These observations complement the contiguous Infrared Astronomy Satellite and Diffuse Infrared Background Experiment (DIRBE) Cosmic Background Explorer surveys by extending the mid-infrared coverage beyond the solar exclusion limits of these experiments and measuring the emission at much higher spatial resolution. The MSX observations are at high sensitivity, ~2×10-12 cm-2 μm sr-1, and spatial resolution, 2' to 3'. The MSX and DIRBE measurements are in good agreement where they do overlap. We describe the data processing that created the database and the estimated accuracy and precision.

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