Home > Iowa Academy of Science > Journals & Newsletters > Proceedings of the Iowa Academy of Science > Volume 33 (1926) > Annual Issue
Document Type
Research
Abstract
Observations of the solar surface were commenced by the writer in August, 1890, and brief reviews have been published in these Proceedings from time to time, the first being in Volume X, 1902, and succeeding ones in Volume XV, 1908, and Volume XXVIII, 1921, the present paper brings the series down to the close of the year 1925, covering a period of over 35 years and embracing four minimum and three maximum epochs of the 11½ year cycles of solar changes. All of the five years' observations were made with a 5½-inch refracting telescope, equatorially mounted, being the same instrument which has been in use since September, 1907.
Publication Date
1926
Journal Title
Proceedings of the Iowa Academy of Science
Volume
33
Issue
1
First Page
225
Last Page
229
Copyright
©1926 Iowa Academy of Science, Inc.
Language
en
File Format
application/pdf
Recommended Citation
Hadden, David E.
(1926)
"The Solar Surface during the past Five Years a Review of Sunspot Observations Made at Alta Iowa from 1921 to 1925,"
Proceedings of the Iowa Academy of Science, 33(1), 225-229.
Available at:
https://scholarworks.uni.edu/pias/vol33/iss1/50