Existence of Nanoparticle Dust Grains in the Inner Solar Corona

摘要: Motivated by the recent paper Habbal et al., we have made spectroscopic observations in wavelength range of 1072.8-1079.0 nm solar corona above coronal hole region on several days using a coronagraph. We raster scans as well other regions for comparison. The exposure time 200 s at single location permitted us to detect signals order 10-7 disk brightness. did not find any indication emission around 1074.7 due fluorescence from silicon nanoparticle dust grains inner proposed al. This may be absence or our detection limit.