Digitization of sunspot drawings by Spörer made in 1861-1894

Horizontal flow fields observed in Hinode G-band images

(2014) M. Verma et al.   ASTRONOMY & ASTROPHYSICS

Properties of sunspot umbrae observed in cycle 24

(2014) Christoph Kiess et al.   ASTRONOMY & ASTROPHYSICS

Sunspot positions and sizes for 1825–1867 from the observations by Samuel Heinrich Schwabe

(2013) R. Arlt et al.   MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

Recovering Joy’s Law as a Function of Solar Cycle, Hemisphere, and Longitude

(2013) B. H. McClintock et al.   SOLAR PHYSICS

The sunspot observations by Samuel Heinrich Schwabe

(2011) R. Arlt   ASTRONOMISCHE NACHRICHTEN

The Solar Dynamics Observatory (SDO)

(2011) W. Dean Pesnell et al.   SOLAR PHYSICS

HSUNSPOTS: A tool for the analysis of historical sunspot drawings

(2010) A. Cristo et al.   JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS

The solar observations at Armagh Observatory in 1795-1797

(2009) R. Arlt   ASTRONOMISCHE NACHRICHTEN

The Butterfly Diagram in the Eighteenth Century

(2009) R. Arlt   SOLAR PHYSICS

Digitization of Sunspot Drawings by Staudacher in 1749 – 1796

(2008) R. Arlt   SOLAR PHYSICS