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Browsing by Subject "Sun: interior"

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Double Peaks of the Solar Cycle: An Explanation from a Dynamo Model

Karak, B. B; Mandal, Sudip; Banerjee, D (IOP Publishing, 2018-10-10)

One peculiar feature of the solar cycle that is yet to be understood properly is the frequent occurrence of double peaks (also known as the Gnevyshev peaks). The double peaks, and also multiple peaks and spikes, are often ...
The extended solar cycle: muddying the waters of solar/stellar dynamo modeling or providing crucial observational constraints?

Srivastava, Abhishek K; McIntosh, Scott W; Arge, N; Banerjee, D; Dikpati, Mausumi; Dwivedi, Bhola N; Guhathakurta, Madhulika; Karak, B. B; Leamon, Robert J; Matthew, Shibu K; Munoz-Jaramillo, Andres; Nandy, D; Norton, Aimee; Upton, L; Chatterjee, S; Rakesh, M; Yamini K. Rao; Rahul Yadav (Frontiers, 2018-11-22)

"In 1844 Schwabe discovered that the number of sunspots increased and decreased over a period of about 11 years, that variation became known as the sunspot cycle. Almost eighty years later, Hale described the nature of the ...
GONG instrument and science

Harvey, J; The GONG Team (Astronomical Society of India, 1998-09)

The Global Oscillation Network Group (GONG) is an international project to study the solar interior using helioseismology. The major goal is to accurately measure those modes of solar acoustic oscillations that have global ...
Helioseismic inferences from the GONG data

Antia, H. M (Astronomical Society of India, 1998)

To accurately measured frequencies of solar oscillations provide a powerful tool to study the solar interior in sufficient detail to test theories of stellar structure and evolution. A primary inversion of these frequencies ...
Horizontal flows in active regions from ring-diagram and local correlation tracking methods

Jain, K; Tripathy, S. C; Ravindra, B; Komm, R; Hill, F (IOP Publishing, 2016-01)

Continuous high-cadence and high spatial resolution Dopplergrams allow us to study subsurface dynamics that may be further extended to explore precursors of visible solar activity on the surface. Since the p -mode ...
Long-term variability of the solar cycle in the Babcock-Leighton dynamo framework

Karak, B. B; Miesch, Mark (Cambridge University Press, 2018-02)

We explore the cause of the solar cycle variabilities using a novel 3D Babcock– Leighton dynamo model. In this model, based on the toroidal flux at the base of the convection zone, bipolar magnetic regions (BMRs) are ...
Meridional circulation in the solar convection zone: time-distance helioseismic inferences from four years of HMI/SDO observations

Rajaguru, S. P; Antia, H. M (IOP Publishing, 2015-11-10)

We present and discuss results from time–distance helioseismic measurements of meridional circulation (MC) in the solar convection zone using 4 yr of Doppler velocity observations by the Helioseismic and Magnetic Imager ...
Probes of the solar interior

Chitre, S. M; Antia, H. M (Astronomical Society of India, 1998)

The interior of the sun is not directly accessible to observations. Nonetheless, it is possible to infer the physical conditions prevailing in the solar interior with the help of theory of stellar structure and the powerful ...
Recovery from Maunder-like Grand Minima in a Babcock-Leighton Solar Dynamo Model

Karak, B. B; Miesch, Mark (IOP Publishing, 2018-06-20)

he Sun occasionally goes through Maunder-like extended grand minima when its magnetic activity drops considerably from the normal activity level for several decades. Many possible theories have been proposed to explain the ...
Solar meridional circulation from twenty-one years of SOHO/MDI and SDO/HMI observations Helioseismic travel times and forward modeling in the ray approximation

Liang, Zhi-Chao; Gizon, L; Birch, A. C; Duvall, T. L. Jr; Rajaguru, S. P (EDP Sciences, 2018-11)

Context. The solar meridional flow is an essential ingredient in flux-transport dynamo models. However, no consensus on its subsurface structure has been reached. Aims. We merge the data sets from SOHO/MDI and SDO/HMI ...
Steady part of the sun's internal rotation

Hiremath, K. M; Gokhale, M. H (Astronomical Society of India, 1998)

It is shown that steady part of rotation in the Sun's convective envelope (CE) and radiative core (RC)can be determined as an analytical solution of the diffusion equation in an incompressible medium of constant diffusivity. ...
A theoretical model of the near-surface shear layer of the Sun

Jha, Bibhuti K; Choudhuri, A. R (Oxford University Press on behalf of the Royal Astronomical Society, 2021-09)

The Sun has a near-surface shear layer (NSSL), within which the angular velocity decreases rapidly with radius. We provide an explanation of this layer based on the thermal wind balance equation. Since convective motions ...
A theoretical study of the Build-Up of the Sun's Polar Magnetic Field by using a 3D Kinematic Dynamo Model

Hazra, G; Choudhuri, A. R; Miesch, Mark S (IOP Publishing, 2017-01-20)

We develop a three-dimensional kinematic self-sustaining model of the solar dynamo in which the poloidal field generation is from tilted bipolar sunspot pairs placed on the solar surface above regions of strong toroidal ...
Using solar oscillations to constrain the equation of state and low-temperature opacities

Guzik, J. A; Cox, A. N; Swenson, F. J (Astronomical Society of India, 1996)

Because thousands of solar p-mode oscillation frequencies have been measured to high accuracy, direct comparisons between calculated and observed frequencies are an excellent means of testing solar interior physics. Here ...

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Browsing by Subject "Sun: interior"

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