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- Title
Sunspot Observations Made by Hallaschka During the Dalton Minimum.
- Authors
Carrasco, V. M. S.; Vaquero, J. M.; Arlt, R.; Gallego, M. C.
- Abstract
We present and analyse the sunspot observations performed by Franz I.C. Hallaschka in 1814 and 1816. These solar observations were carried out during the so-called Dalton minimum, around the maximum phase of Solar Cycle 6. These records are very valuable because they allow us to complete observational gaps in the collection of sunspot group numbers, improving the coverage for this epoch. We have analysed and compared the observations made by Hallaschka with the records made by other contemporary observers. Unfortunately, the analysis of the sunspot areas and positions showed that they are too inaccurate for scientific use. We conclude, however, that the sunspot counts made by Hallaschka are similar to those made by other astronomers of that time. The observations by Hallaschka confirm a low level of solar activity during the Dalton minimum.
- Subjects
SUNSPOTS; ASTRONOMICAL observations; DALTON minimum (Solar cycle); ASTRONOMERS; SOLAR activity
- Publication
Solar Physics, 2018, Vol 293, Issue 7, p1
- ISSN
0038-0938
- Publication type
Article
- DOI
10.1007/s11207-018-1322-5