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207058.0 [No comment] 20.01.2005 14:36 Released

ID: 207058.0, MPI für Kernphysik / Interplanetary Dust Physics
Dust Near The Sun
Authors:Mann, Ingrid; Kimura, Hiroshi; Biesecker, Douglas A.; Tsurutani, Bruce T.; Grün, Eberhard; McKibben, R. Bruce; Liou, Jer-Chyi; MacQueen, Robert M.; Mukai, Tadashi; Guhathakurta, Madhulika; Lamy, Philippe
Date of Publication (YYYY-MM-DD):2004
Title of Journal:Space Science Reviews
Issue / Number:3
Start Page:269
End Page:305
Copyright:Kluwer Academic Publishers
Review Status:not specified
Audience:Experts Only
Abstract / Description:We review the current knowledge and understanding of dust in the inner solar system. The major sources of the dust population in the inner solar system are comets and asteroids, but the relative contributions of these sources are not quantified. The production processes inward from 1 AU are: Poynting-Robertson deceleration of particles outside of 1 AU, fragmentation into dust due to particle-particle collisions, and direct dust production from comets. The loss processes are: dust collisional fragmentation, sublimation, radiation pressure acceleration, sputtering, and rotational bursting. These loss processes as well as dust surface processes release dust compounds in the ambient interplanetary medium. Between 1 and 0.1 AU the dust number densities and fluxes can be described by inward extrapolation of 1 AU measurements, assuming radial dependences that describe particles in close to circular orbits. Observations have confirmed the general accuracy of these assumptions for regions within 30° latitude of the ecliptic plane. The dust densities are considerably lower above the solar poles but Lorentz forces can lift particles of sizes <5 μm to high latitudes and produce a random distribution of small grains that varies with the solar magnetic field. Also long-period comets are a source of out-of-ecliptic particles. Under present conditions no prominent dust ring exists near the Sun. We discuss the recent observations of sungrazing comets. Future in-situ experiments should measure the complex dynamics of small dust particles, identify the contribution of cometary dust to the inner-solar-system dust cloud, and determine dust interactions in the ambient interplanetary medium. The combination of in-situ dust measurements with particle and field measurements is recommended.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group K. Mauersberger/Interplantary Dust Research (E. Grün)
External Affiliations:Institut für Planetologie, Westfälische Wilhelms-Universität, Münster, Germany
NOAA, Space Environment Center, Boulder, CO, USA
Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
Department of Physics and Space Science Center, University of New Hampshire, Durham, NH, USA
Lockheed Martin Space Operations, Houston, TX, USA
Rhodes College, Memphis, TN, USA
Graduate School of Science and Technology, Kobe University, Kobe, Japan