Influence of dust shape and material composition on the solar F-corona

Details Influence of dust shape and material composition on the solar F-corona Influence of dust shape and material composition on the solar F-corona

Aug 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998p%26ss...46..911k&link_type=abstract

Planetary and Space Science, Volume 46, Issue 8, p. 911-919.

Computer Science

8

Scientific paper

We investigate the influences of dust shape and material composition on the brightness and reddening of the solar F-corona. Silicate and carbon are considered as the F-coronal dust material to represent low and high absorbing materials, respectively. The observational data of the visible and near-infrared F-coronal brightness are well reproduced by our model of porous grains. We find that a change in the amount of highly absorbing particles near the Sun can cause a variation in the radial slope of the near-infrared F-coronal brightness, as well as of the coronal reddening. Hence a temporal variation of coronal features may be connected to a variation of the dust cloud composition rather than to the variation of a solar dust ring, which may or may not exist around the Sun. Further analysis of the influence of the dust size distribution on the F-coronal reddening shows that a drastic change of the size distribution is unlikely.

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