Special Issue: The PLANET-B Misson and Related Science
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Mars Dust Counter
Earth, Planets and Space volume 50, pages 241–245 (1998)
Abstract
In order to unveil the presence and characteristics of Martian dust ring/torus, Mars Dust Counter (MDC) is aboard ISAS’s spacecraft PLANET-B, which will be launched in 1998 summer and investigate the upper atmosphere and surrounding environment of Mars between 1999 and 2001. MDC PLANET-B is an improved version of impact-ionization dust detectors aboard HITEN and BREMSAT. It weighs only 730 g with the sensor aperture area of 140 cm2. To improve signal to noise ratios and to precisely determine the risetime of signals, a neutral target channel is added independent of ion and electron target channels. Detectable velocity (v) range is between 1 km/s and more than 70 km/s, which will cover all possible dust clans: circummartian (low v), interplanetary (mid v), and interstellar (high v) particles. Measurable mass range is 5 × 10−15 and 10−10 g at v = 10 km/s. Since PLANET-B takes an elliptic retrograde orbit around Mars, MDC can investigate particles from Phobos and Deimos with relative velocity higher than 1 km/s. Therefore, MDC can clarify the presence of a confined dust ring along Phobos’ orbit and an extended dust torus along Deimos’ orbit, and it may answer whether these ring and torus are self-sustained or not. Since the nominal operation of PLANET-B is longer than one Martian year, MDC may detect predicted seasonal variation of the ring/torus structure.
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Igenbergs, E., Sasaki, S., Münzenmayer, R. et al. Mars Dust Counter. Earth Planet Sp 50, 241–245 (1998). https://doi.org/10.1186/BF03352110
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DOI: https://doi.org/10.1186/BF03352110