261 citations · 1.6k across the 44 of their papers we have counts for
24 papers · 1 filter
Dark dots on the photosphere and counting of the sunspots index
Andrey G. Tlatov
On modern satellite observations of the Sun in the continuum with high spatial resolution, as well as on high-quality ground observations, a large number of small dark areas can be…
The shape of sunspots and solar activity cycles
Andrey Tlatov
The paper presents the results of the analysis of the geometric characteristics of sunspots for the period of 19-24 cycles of activity. The shape of sunspots was studied on the bas…
Parametrization of sunspot groups based on machine learning approach
Egor Illarionov, Andrey Tlatov
Sunspot groups observed in white-light appear as complex structures. Analysis of these structures is usually based on simple morphological descriptors which capture only generic pr…
Machine-learning approach to identification of coronal holes in solar disk images and synoptic maps
Egor Illarionov, Alexander Kosovichev, Andrey Tlatov
Identification of solar coronal holes (CHs) provides information both for operational space weather forecasting and long-term investigation of solar activity. Source data for the f…
Analysis of full disc Ca II K spectroheliograms III. Plage area composite series covering 1892-2019
Theodosios Chatzistergos, Ilaria Ermolli, Natalie A. Krivova +16
We derive the plage area evolution over the last 12 solar cycles employing data from all Ca II K archives available publicly in digital form known to us, including several as yet u…
The mean tilt of sunspot bipolar regions: theory, simulations and comparison with observations
N. Kleeorin, N. Safiullin, K. Kuzanyan +3
A theory of the mean tilt of sunspot bipolar regions (the angle between a line connecting the leading and following sunspots and the solar equator) is developed. A mechanism of for…