The chromosphere above a sunspot umbra |
| |
| Authors: | H A Beebe W E Baggett H S Yun |
| |
| Institution: | (1) Department of Astronomy, New Mexico State University, Las Cruces, New Mexico, U.S.A.;(2) Department of Astronomy, Seoul National University, Seoul, Korea |
| |
| Abstract: | Spectra of several strong lines of sunspots have been obtained with the Echelle spectrograph at the Vacuum Tower Telescope, Sacramento Peak Observatory. With a variety of model atmospheres, Ca ii H, K, and  18498 line profiles were calculated using a non-LTE line formation procedure.In the present study we examined only a specific part of the sunspot umbra which is thought to be coolest over the spot. An optimum model representing such a region is presented and its physical properties are discussed.This work has been supported by the U.S. - Republic of Korea Cooperative Science Program (K-24). |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
