Structure of sunspot umbras, studied from photographs obtained from stratoscope i flights
The structure of sunspot umbras. i - observations.
01.01.1964
Sonstige
Keine Angabe
Englisch
High-resolution sunspot observations
NTRS | 1991
|High-resolution sunspot observations
Elsevier | 1991
|Historical sunspot observations: A review
Online Contents | 2007
|Sunspot group tilt angle measurements from historical observations
Online Contents | 2016
|