𝔖 Bobbio Scriptorium
✦   LIBER   ✦

A “lost” sunspot observation in 1785

✍ Scribed by J. M. Vaquero; R. M. Trigo; M. C. Gallego

Book ID
101700715
Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
173 KB
Volume
326
Category
Article
ISSN
0004-6337

No coin nor oath required. For personal study only.

✦ Synopsis

Abstract

The reconstruction of the solar activity during some years of the 18th century is poorly known because there are scarce sunspot observations. The aim of this short contribution is to present a “lost” sunspot observation realized by the Portuguese scientist Sanches Dorta during his observation of the solar eclipse of 1785 from Rio de Janeiro (Brazil). This record was not included in the database compiled by Hoyt and Schatten (1998). We present new estimations of the solar activity during 1785. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

📜 SIMILAR VOLUMES

The oscillatory velocity field observed
The oscillatory velocity field observed in a unipolar sunspot region
✍ J. B. Rice; V. Gaizauskas 📂 Article 📅 1973 🏛 Springer 🌐 English ⚖ 640 KB

The velocity field has been mapped for 42 min in an area 80" by 85" containing a unipolar sunspot. Apparent shifts of Fe 1 2 5233 were measured photoelectrically using a rectangular scanning aperture 1.6" • 4.0". The sunspot did not exert a marked influence on the generally random pattern of oscilla