Heating of spherical interplanetary particles close to the sun (solar probe HELIOS A and B: Experiment 10 z)

Details Heating of spherical interplanetary particles close to the sun (solar probe HELIOS A and B: Experiment 10 z) Heating of spherical interplanetary particles close to the sun (solar probe HELIOS A and B: Experiment 10 z)

Dec 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978ruhr.rept.....r&link_type=abstract

Final Report Ruhr Univ., Bochum (Germany, F.R.). Bereich Extraterrestrische Physik.

Physics

Helios Satellites, Interplanetary Dust, Micrometeorites, Solar Heating, Mie Scattering, Radiation Pressure, Temperature Profiles

Scientific paper

The temperature of interplanetary dust grains as a function of solar distance is discussed, adopting simplified assumptions for the energy distribution in the solar spectrum. These temperatures determine strongly possible evaporation close to the sun. This is important for the interpretation of helios measurements, especially with respect to micrometeorites. After a thorough review and compilation of the theoretical background (Mie-formalism), the efficiency factors for absorption and radiation pressure were calculated taking into account the wavelength dependence of refractive indices of different materials. Using these data and the energy distribution of the solar spectrum, equilibrium temperatures were computed for particles up to 100 microns in size. Considerable differences between the materials (magnetite, obsidian, andesite, olivine) were found. Furthermore deviations of equilibrium temperatures from the blackbody approximation, especially in the size region 0.2 microns, suggest different particle concentrations near the sun for different types of particles depending on size and material.

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