Polar Activity of the Sun and Latitudinal Activity Drifts in Cycles 15–24     

Tlatov  A. G.  Tlatova  K. A. 《Geomagnetism and Aeronomy》2019,59(8):1016-1021

Geomagnetism and Aeronomy - The solar activity at different latitudes is analyzed based on daily observations at Kodaikanal, Mount Wilson, Sacramento Peak, and Meudon observatories in the CaIIK...  相似文献   

Prominence Characteristics in 16th Activity Cycle     

K. A. Tlatova  V. G. Nagnibeda 《Geomagnetism and Aeronomy》2017,57(7):829-834

Digitization of the daily prominence sketches based on data from the global observational network of visual solar spectroscopes was performed for 1922–1934. More than 55000 prominences were distinguished. The results of analysis of distributions by area, height, and prominence location are presented. In addition, the prominence characteristics were compared to those obtained from more recent observations at the Kislovodsk Mountain Astronomical Station of Pulkovo Observatory. The distributions of prominence areas and heights are close to lognormal. The maximal height distribution corresponds to ~25–40 arcsecs. A second maximum also exists for prominence heights of ~70–90 arcsecs.  相似文献   

Influence of Supergranulation on the Properties of Sunspot Bipoles     

Tlatov  A. G.  Tlatova  K. A. 《Geomagnetism and Aeronomy》2018,58(7):959-965

Geomagnetism and Aeronomy - The properties of solar bipoles based on data from magnetic field observations at Mount Wilson Observatory during the period of 1917–2016 are considered. Special...  相似文献   

Reconstruction of Centennial Series of Solar Activity     

Tlatova  K. A.  Vasil’eva  V. V.  Skorbezh  N. N.  Illarionov  E. A.  Tlatov  A. G. 《Geomagnetism and Aeronomy》2018,58(8):1021-1028

Geomagnetism and Aeronomy - The results of the digitalization of the centennial series of solar activity are considered. The data contain information on sunspots since 1918, sunspot umbra since...  相似文献   

Influence of the Change in the Relative Number of Pores in Activity Cycles on the Reconstruction of the Sunspot Index     

Tlatova  K. A.  Vasil’eva  V. V.  Berezin  I. A.  Illarionov  E. A.  Tlatov  A. G. 《Astronomy Reports》2022,66(2):165-173

Astronomy Reports - An analysis of the relative number of groups in cycles 21–24 based on the digitization of observations of sunspots at the Locarno Observatory (Locarno, Switzerland) was...  相似文献   

Long-term variations in the sunspot magnetic fields and bipole properties from 1918 to 2014     

K. A. Tlatova  V. V. Vasil’eva  A. A. Pevtsov 《Geomagnetism and Aeronomy》2015,55(7):896-901

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Drift of Polar Prominences in Solar Cycles 13–24     

Tlatova  K. A.  Vasil’eva  V. V.  Tlatov  A. G. 《Geomagnetism and Aeronomy》2019,59(8):1022-1028

Geomagnetism and Aeronomy - A comparative analysis of the drift velocity of high-latitude prominences to the poles in solar cycles 13–24 is carried out. Data on the positions of prominences...  相似文献   

Polar and Low-Latitude Faculae in Activity Cycles 23–24     

Tlatov  A. G.  Tlatova  K. A. 《Geomagnetism and Aeronomy》2020,60(7):825-830

Geomagnetism and Aeronomy - Polar and low-latitude faculae were identified in daily images based on white-light observations from the MDI (1996–2011) and SOHO (2010–2019) space...  相似文献   

Reconstruction of a Hundred Years Series of Solar Filaments from Daily Observational Data     

K. A. Tlatova  V. V. Vasil’eva  A. G. Tlatov 《Geomagnetism and Aeronomy》2017,57(7):825-828

The preliminary results of solar filaments distinguished in daily H-alpha observations at Kodaikanal (1912–2002) are presented. To mark the boundaries of solar filaments, methods based on automated procedures of marking low-contrast objects on the solar disk, as well as editing of the marked boundaries in a semiautomated manner, were developed. The characteristics of solar filaments were analyzed. Latitudinal diagrams of filaments number in 15–23 activity cycles were constructed. As is shown, one maximum in the filament latitudinal distribution may be clearly distinguished during activity cycles in both hemispheres. This maximum is located slightly higher (θ ~ 25°–30°) than the sunspot distribution maximum (θ ~ 14°–17°). However, there are no other local maxima related to the zonal structure of the large-scale magnetic field (Makarov and Sivaraman, 1989).  相似文献   

The Characteristic Sizes of the Sunspots and Pores in Solar Cycle 24     

Tlatov  Andrey  Riehokainen  Alexandr  Tlatova  Kseniya 《Solar physics》2019,294(4):1-10

Recent dedicated Hinode polar region campaigns revealed the presence of concentrated kilogauss patches of the magnetic field in the polar regions of the Sun, which are also shown to be correlated with facular bright points at the photospheric level. In this work, we demonstrate that this spatial intermittency of the magnetic field persists even up to the chromospheric heights. The small-scale bright elements visible in the bright network lanes of the solar network structure as seen in the Ca ii H images are termed network bright points. We use special Hinode campaigns devoted to the observation of polar regions of the Sun to study the polar network bright points during the phase of the last extended solar minimum. We use Ca ii H images of chromosphere observed by the Solar Optical Telescope. For magnetic field information, level-2 data of the spectro-polarimeter is used. We observe a considerable association between the polar network bright points and magnetic field concentrations. The intensity of such bright points is found to be correlated well with the photospheric magnetic field strength underneath with a linear relation existing between them.

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