EUV observations of the active sun from the Harvard experiment on ATMSome extreme UV observations of solar active regions made with a scanning spectroheliometer are described. Spectroheliograms constructed from digital data using a computer-driven cathode-ray tube display show clearly how the appearance of an active region changes as a function of temperature. Flare studies indicate that the impulsive rise in EUV emission occurs essentially simultaneously at all levels from the transition zone to the corona. Observations of sunspots reveal a very intense emission in transition zone lines. A matrix of Mg x rasters covering the entire sun reveals several hundred bright points having dimensions of 30 arc seconds or less. Other observations include coronal holes and prominences.
Document ID
19760027161
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Noyes, R. W. (Harvard Coll. Observatory Cambridge, MA, United States)
Foukal, P. V. (Harvard Coll. Observatory Cambridge, MA, United States)
Reeves, E. M. (Harvard Coll. Observatory Cambridge, MA, United States)
Schmahl, E. J. (Harvard Coll. Observatory Cambridge, MA, United States)
Timothy, J. G. (Harvard Coll. Observatory Cambridge, MA, United States)
Vernazza, J. E. (Harvard Coll. Observatory Cambridge, MA, United States)
Withbroe, G. L. (Smithsonian Astrophysical Observatory and Harvard College Observatory Cambridge, Mass., United States)
Huber, M. C. E. (Harvard Coll. Observatory Cambridge, MA, United States)