On geomagnetic sudden commencements, sudden impulses, and storm durations : Matsushita, S., High Altitude Observatory, Boulder, Colorado, Journal of Geophysical Research, Sept., 1962, 25 pp.

Abstract

It is common to use imaging instruments such as EUV and X-ray imagers and coronagraphs to study large-scale phenomena such as coronal mass ejections and coronal waves. Although high resolution spectroscopy is generally limited to a small field of view, its importance in understanding global phenomena should not be under-estimated. I will review current spectroscopic observations of large-scale dynamic phenomena such as global coronal waves and coronal mass ejections. The aim is to determine plasma parameters such as flows, temperatures and densities to obtain a physical understanding of these phenomena.