Eclipse observations in the rocket ultraviolet

Abstract

Abstraet. An Aerobee 150 was launched into the umbra from Wallops Island at 18:36:15 UT 7 March, 1970, carrying two intensity calibrated EUV Wadsworth grating spectrographs. The experiment was a collaborative venture between groups from A.R.U. Culham, H.C.O., Imperial College and York University, Toronto. This was the first attempt to record stigmatic spectra of the chromosphere and corona in the EUV, analogous to the visible eclipse Flash Spectrum.A wealth of new observational data has demonstrated the importance of a new instrumental and experimental technique for recording the ultraviolet flash spectrum. Lyman-~ limb spectroheliograms reveal complex activity extending high into the corona in contrast to the modest level of activity observed in H~. Preliminary intensity reduction shows that Lyman-~ dominates as the principle radiation loss for these features.