N. V. Zolotova
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View article: On the Penumbra-to-Umbra Ratio from 1660 to 1676
On the Penumbra-to-Umbra Ratio from 1660 to 1676 Open
Sunspot engravings made in the Maunder minimum are used to evaluate the fine structure of sunspots. Based on 78 images of the full solar disk and 77 images of individual sunspots, we have evaluated the ratio of penumbral-to-umbral area (P/…
View article: Sunspot Observations at the Eimmart Observatory: Revision and Supplement
Sunspot Observations at the Eimmart Observatory: Revision and Supplement Open
Digital images of sunspot drawings of the archives of Georg Christoph Eimmart stored at the National Library of Russia, St. Petersburg, are analyzed to obtain sunspot-group numbers and sunspot areas as well as heliographic positions. Overa…
View article: Sunspot Observations at the Eimmart Observatory: Revision and Supplement
Sunspot Observations at the Eimmart Observatory: Revision and Supplement Open
Digital images of sunspot drawings of the archives of Georg Christoph Eimmart stored at the National Library of Russia are analyzed to obtain sunspot group numbers and sunspot areas as well as heliographic positions. Overall, more than a h…
View article: Long-term North–South Asymmetry of the Heliospheric Current Sheet
Long-term North–South Asymmetry of the Heliospheric Current Sheet Open
In this paper, we evaluate the heliospheric current sheet (HCS) north–south asymmetry using the ecliptical sector structure of the interplanetary magnetic field (IMF) reconstructed since the second half of the 19th century. During the last…