The solar F-corona at 2.12 pin: calculations of near-solar dust in comparison to 1991 eclipse observations

Details The solar F-corona at 2.12 pin: calculations of near-solar dust in comparison to 1991 eclipse observations The solar F-corona at 2.12 pin: calculations of near-solar dust in comparison to 1991 eclipse observations

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...275..293m&link_type=abstract

Astronomy and Astrophysics, Vol. 275, p. 293 (1993)

Astronomy and Astrophysics

Astrophysics

21

Sun: Corona, Interplanetary Medium, Eclipses

Scientific paper

A comparison of 1991 solar eclipse coronal observations over the range of 3Rsun-8Rsun at wavelength 2.12 μm, with model calculations of thermal emission and scattering from interplanetary dust particles (IDPs) is presented. The observed brightness in the ecliptic plane shows a monotonic decrease which can be approximated with a radial power law with exponent 2. No signature in the brightness, due to enhanced dust concentration or emission near the Sun can be detected. The modelling attempts result in an average deviation, relative to the observations, of less than 12%, under reasonable assumptions about the spatial distribution and optical and thermal properties of the IDPs. It is only possible to match the observational data with a model of scattering and thermal emission where particles can approach up to 3Rsun towards the Sun. The data suggest that it is necessary to alter the local variation of number density of dust particles within 10Rsun. The deduced temperature of the IDPs is about 10% below their blackbody temperature, and the best fit with observations involves a variation in the IDP albedo with distance from the Sun, suggesting physical changes to the near-solar IDP population.

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