Physical properties of solar chromospheric plages |
| |
Authors: | Richard A Shine Jeffrey L Linsky |
| |
Institution: | 1. Joint Institute for Laboratory Astrophysics University of Colorado and National Bureau of Standards, 80302, Boulder, Colo., U.S.A.
|
| |
Abstract: | We propose chromospheric models of plages to explain profiles of the Ca ii H, K, λl8498, λ8542, and λ8662 lines described in Paper I. These models are consistent with boundary conditions imposed by the photosphere and the Lyman continuum. We find that increasing emission in these lines is consistent with a picture of increasing temperature gradient in the low chromosphere and the resulting increase in pressure and electron density at similar line optical depths. With this picture we suggest how to empirically determine the distribution of chromospheric parameters across the solar disk directly from Ca ii filtergrams. We also propose that the high density aspects of solar activity are produced by steep temperature gradients in the low chromosphere and thus by the enhanced heating mechanisms that steepen these gradients. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|