SECULAR VARIATIONS OF LONG-LIVED SUNSPOTS.
Abstract
Number and area distribution of spot groups of intermediate and long lifetimes have been studied in the period 1889-1954, as well as the area development curves of individual long-lived spots in the period 1914-1954. Eigenson's recurrence indices have been revised. Various secular variations have been found. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 17, 1964
- Accession Number
- AD0616992
Entities
People
- Truls S. Ringnes
Organizations
- University of Oslo