Документ взят из кэша поисковой машины. Адрес оригинального документа : http://star.arm.ac.uk/~ambn/abstract290.html Дата изменения: Fri May 22 17:49:44 1998 Дата индексирования: Tue Oct 2 00:25:09 2012 Кодировка: Поисковые слова: annular solar eclipse

Line widths derived from observational data obtained by SUMER onboard SOHO in August 1996 at disk center and at the limb are used to confront those derived via assuming Alfven and/or magneto-acoustic wave heating. The observational data clearly shows a center-to-limb variation in the upper chromospheric and transition region lines, with only a marginal difference in the coronal lines in the sense of additional broadening further from disk center. Numerical estimations based on linear MHD, favour the existence of Alfven wave heating over magneto-acoustic heating, although further calculations are required. For example, a non-linear dispersion relationship could change the group velocity which in turn can have major effect on the overall line broadening.