208 citations · 494 across the 14 of their papers we have counts for
14 papers
Periodicities of solar activity and solar radiation derived from observations and their links with the terrestrial environment
Valentina V. Zharkova, Irina Vasilieva, Simon Shepherd +1
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…
Comparison of solar activity proxies: eigen vectors versus averaged sunspot numbers
V. V. Zharkova, I. Vasilieva, S. J. Shepherd +1
We attempt to establish links between a summary curve, or modulus summary curve, MSC, of the solar background magnetic field (SBMF) derived from Principal Component Analysis, with…
Solar activity, solar irradiance and terrestrial temperature
Valentina Zharkova
In this study we overview recent advances with prediction of solar activity using as a proxy solar background magnetic field and detection of grand solar cycles of about 400 years…
Oscillations of the baseline of solar magnetic field and solar irradiance on a millennial timescale
V. V. Zharkova, S. J. Shepherd, E. Popova
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 indicate that t…
Reinforcing the double dynamo model with solar-terrestrial activity in the past three millennia
V. V. Zharkova, S. J. Shepherd, E. Popova +1
Using a summary curve of two eigen vectors of solar magnetic field oscillations derived with Principal Components Analysis (PCA) from synoptic maps for solar cycles 21-24 as a prox…
On the Seismicity of September 7, 2011 X1.8-class Flare
S. Zharkov, L. M. Green, S. A. Matthews +1
We present results of our preliminary analysis of acoustically active X-class flare of September 7, 2011. We report two acoustic sources detected via acoustic holography and verifi…
Properties of the 15 February 2011 Flare Seismic Sources
S. Zharkov, L. M. Green, S. A. Matthews +1
The first near-side X-class flare of the Solar Cycle 24 occurred in February 2011 and produced a very strong seismic response in the photosphere. One sunquake was reported by Kosov…
Recent Advances in Understanding Particle Acceleration Processes in Solar Flares
Valentina V. Zharkova, Karpar Arzner, Arnold O. Benz +11
We review basic theoretical concepts in particle acceleration, with particular emphasis on processes likely to occur in regions of magnetic reconnection. Several new developments a…
February 15, 2011: sun-quakes produced by flux rope eruption
S. Zharkov, L. M. Green, S. A. Matthews +1
We present an analysis of the 15 February 2011 X-class solar flare, previously reported to produce the first sunquake in solar cycle 24 (Kosovichev 2011). Using acoustic holography…
Comparison of seismic signatures of flares obtained by SOHO/MDI and GONG instruments
S. Zharkov, V. V. Zharkova, S. A. Matthews
The first observations of seismic responses to solar flares were carried out using time-distance (TD) and holography techniques applied to SOHO/MDI Dopplergrams obtained from space…
Stationary and impulsive injection of electron beams in converging magnetic field
Taras V. Siversky, Valentina V. Zharkova
In this work we study time-dependent precipitation of an electron beam injected into a flaring atmosphere with a converging magnetic field by considering collisional and Ohmic loss…
Particle acceleration in a reconnecting current sheet: PIC simulation
Taras V. Siversky, Valentina V. Zharkova
The acceleration of protons and electrons in a reconnecting current sheet (RCS) is simulated with a particle-in-cell (PIC) 2D3V code for the proton-to-electron mass ratio of 100. T…
On the origin of 3 seismic sources in the proton-rich flare of October 28, 2003
V. V. Zharkova, S. I. Zharkov
The 3 seismic sources S1, S2 and S3 detected from MDI dopplergrams using the time-distance diagram technique are presented with the locations, areas and vertical and horizontal vel…
A Neural-Network Technique for Recognition of Filaments in Solar Images
V. V. Zharkova, V. Schetinin
We describe a new neural-network technique developed for an automated recognition of solar filaments visible in the hydrogen H-alpha line full disk spectroheliograms. This techniqu…