Suchergebnisse

The possible sources of the continuous (solar) spectrum of comets are discussed. Four mechanisms are considered :
1) diffuse reflection by the solid nucleus (Lambert's Law) ;
2) scattering by molecules (Rayleigh) ;
3) scattering by small solid particles (Mie) ;
4) scattering by free electrons (Thomson).
It was found that the solar continuum of comets is due in most cases to scattering by small solid particles.
An attempt has also been made to determine the continuous spectrum of comet Arend-Roland by photographic spectrophotometry.

The authors tried to establish a correlation between solar flares and luminosity outbursts of five comets. No definite relationship was found between the variations of visual magnitudes observed by Beyer and the flares reported in the Quarterly Bulletin on Solar Activity. The examination of 75 spectra revealed a correlation only in one case. Finally it seems impossible to prove the existence of such a relationship as long as we have no long series of monochromatic light curves of comets.