Heartbeat of the Sun from Principal Component Analysis and prediction of solar activity on a millenium timescale
VV Zharkova, SJ Shepherd, E Popova, SI Zharkov - Scientific reports, 2015 - nature.com
We derive two principal components (PCs) of temporal magnetic field variations over the
solar cycles 21–24 from full disk magnetograms covering about 39% of data variance, with …
solar cycles 21–24 from full disk magnetograms covering about 39% of data variance, with …
Prediction of solar activity from solar background magnetic field variations in cycles 21–23
SJ Shepherd, SI Zharkov… - The Astrophysical …, 2014 - iopscience.iop.org
ABSTRACT A comprehensive spectral analysis of both the solar background magnetic field
(SBMF) in cycles 21–23 and the sunspot magnetic field in cycle 23 reported in our recent …
(SBMF) in cycles 21–23 and the sunspot magnetic field in cycle 23 reported in our recent …
Periodicities in solar activity, solar radiation and their links with terrestrial environment
VV Zharkova, I Vasilieva, SJ Shepherd… - Natural Science, 2023 - go7publish.com
Solar magnetic activity is expressed via variations of sunspots and active regions varying on
different timescales. The most accepted is an 11-year period supposedly induced by the …
different timescales. The most accepted is an 11-year period supposedly induced by the …
[HTML][HTML] RETRACTED ARTICLE: Oscillations of the baseline of solar magnetic field and solar irradiance on a millennial timescale
VV Zharkova, SJ Shepherd, SI Zharkov, E Popova - Scientific Reports, 2019 - nature.com
Recently discovered long-term oscillations of the solar background magnetic field
associated with double dynamo waves generated in inner and outer layers of the Sun …
associated with double dynamo waves generated in inner and outer layers of the Sun …
Theoretical and Observed Signs of Excitation of Small-Scale Magnetic Fluctuations in the Depth of the Sun
VN Krivodubskij, NM Kondrashova - Kinematics and Physics of Celestial …, 2023 - Springer
An actual problem today is the search for observed evidence of the existence of deep small-
scale magnetic fields of the Sun. In this regard, the authors analyzed the theoretical criterion …
scale magnetic fields of the Sun. In this regard, the authors analyzed the theoretical criterion …
Reinforcing a Double Dynamo Model with Solar-Terrestrial Activity in the Past Three Millennia
VV Zharkova, SJ Shepherd, E Popova… - Proceedings of the …, 2017 - cambridge.org
By applying Principal Components Analysis (PCA) to solar magnetic synoptic maps in cycle
21-23 obtained with Wilcox Solar Observatory we derived analytical expressions for two …
21-23 obtained with Wilcox Solar Observatory we derived analytical expressions for two …
On a role of quadruple component of magnetic field in defining solar activity in grand cycles
E Popova, V Zharkova, S Shepherd… - Journal of Atmospheric and …, 2018 - Elsevier
In this paper we revise our prediction of solar activity using a solar background magnetic
field as a proxy by the inclusion of eigen vectors of solar magnetic waves produced by …
field as a proxy by the inclusion of eigen vectors of solar magnetic waves produced by …
Periodicities of solar activity and solar radiation derived from observations and their links with the terrestrial environment
VV Zharkova, I Vasilieva, S Shepherd… - arXiv preprint arXiv …, 2023 - arxiv.org
Solar magnetic activity is expressed via variations of sunspots and active regions varying on
different timescales. The most accepted is an 11-year period supposedly induced by the …
different timescales. The most accepted is an 11-year period supposedly induced by the …
Reply to comment on the paper “on a role of quadruple component of magnetic field in defining solar activity in grand cycles” by Usoskin (2017)
V Zharkova, E Popova, S Shepherd… - Journal of Atmospheric and …, 2018 - Elsevier
In this communication we provide our answers to the comments by Usoskin (2017) on our
recent paper (Popova et al, 2017a). We show that Principal Component Analysis (PCA) …
recent paper (Popova et al, 2017a). We show that Principal Component Analysis (PCA) …
Eigenvectors of solar magnetic field in cycles 21–24 and their links to solar activity indices
VV Zharkova, SJ Shepherd - Monthly Notices of the Royal …, 2022 - academic.oup.com
Using full disc synoptic maps of solar background magnetic field captured from the Wilcox
Solar Observatory for 30 latitudinal bands for cycles 21–24, principal components (PCs) or …
Solar Observatory for 30 latitudinal bands for cycles 21–24, principal components (PCs) or …