Enhancement of stratospheric aerosols after solar proton event

摘要

The lidar measurements at Verhnetulomskiobservatory (68.6°N, 31.8°E) at Kola peninsula detected a considerableincrease of stratospheric aerosol concentration after the solar proton event ofGLE (ground level event) type on the 16/02/84. This increase was located atprecisely the same altitude range where the energetic solar protons lost theirenergy in the atmosphere. The aerosol layer formed precipitated quickly (1–2 kmper day) during 18, 19, and 20 February 1984, and the increase of R(H)(backscattering ratio) at 17 km altitude reached 40% on 20/02/84. We present themodel calculation of CN (condensation nuclei) altitude distribution onthe basis of an ion-nucleation mechanism, taking into account the experimentalenergy distribution of incident solar protons. The meteorological situationduring the event was also investigated.