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- W197010135 abstract "In the all sky survey by the Infrared Astronomical Satellite in 1983, eight comets were discovered to have dust trails [I]. Among those eight comets, the most prominent trail belonged to Tempe1 2, suggesting that this comet recently has been a most prolific producer of interplanetary dust. Numerical simulations that we have carried out of the orbital evolution of 4 and 9 micron diameter dust particles from Tempe1 2 shows that radiation pressure causes a significant fraction of dust particles in this size range to be directly injected into a 1:2 interior mean motion resonance with Jupiter. There, they remain trapped for thousands of years. When they escape the resonance, their orbital eccentricities are usually quite small. These, and dust grains from other similar Tempel-type comets, approach the Earth with the low velocities typical of asteroidal dust grains. A sub-group of chondritic porous aggregate (CPA) interplanetary dust particles (IDP's) that were collected from stratosphere has been shown to have undergone little heating upon entry into the Earth's atmosphere. It is possible that this sub-group of grains derive from Tempel-type comets, and not from asteroids. Comets and asteroids are considered to be the two major sources of Solar System IDP's. IDP spatial abundances in the Solar System are established from zodiacal light measurements [2], from meteoroid impacts onto spacecraft dust sensors [3,4], and from the samples collected by high altitude aircraft in the stratosphere [5,6]. Although the IDPs collected in the stratosphere come from the same complex that forms the zodiacal cloud, their relative proportions are different from those in the zodiacal cloud. This is due both to the Earth gravitational focusing effect and to the atmospheric entry heating process 171. The relative proportion of particles with a low Earth-approaching velocity is significantly enhanced in the stratosphere, through gravitational focusing, compared to those with a high Earth-approaching velocity. The former are also more likely to survive the atmospheric entry heating and to be less altered when captured by high altitude aircraft." @default.
- W197010135 created "2016-06-24" @default.
- W197010135 creator A5054917131 @default.
- W197010135 date "2009-01-01" @default.
- W197010135 modified "2023-09-27" @default.
- W197010135 title "COMETARY SOURCES OF LOW-ENTRY-HEATING CPA IDP'S" @default.
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- W197010135 hasPublicationYear "2009" @default.
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