Results 91 to 100 of about 3,487 (215)

Solar Dynamo Driven by Periodic Flow Oscillation

, 2001
We have proposed that the periodicity of the solar magnetic cycle is determined by wave mean flow interactions analogous to those driving the Quasi Biennial Oscillation in the Earth's atmosphere. Upward propagating gravity waves would produce oscillating
Einaudi, Franco, Mayr, Hans G., Hartle, Richard E.   +2 more
core  

Helioseismic Observations and Modeling of Solar Dynamo

, 2021
Helioseismological observations of the internal dynamics of the Sun during the last two solar activity cycles make it possible to trace the development of solar dynamo processes throughout the depth of the convective zone and to link them with models of ...
Kosovichev, Alexander G., Getling, Alexander V., Pipin, Valery V.   +2 more
core   +1 more source

A solar mean field dynamo benchmark

, 2008
Context. The solar magnetic activity and cycle are linked to an internal dynamo. Numerical simulations are an efficient and accurate tool to investigate such intricate dynamical processes. Aims.
P. Gilman, A. Bonanno, A. S. Brun, M. J. Korpi, D. Moss, M. Dikpati, P. J. Käpylä, A. G. Kosovichev, L. Jouve, A. Brandenburg, R. Arlt, M. Rempel   +11 more
core   +1 more source

Magnetic twist: a source and property of space weather

Journal of Space Weather and Space Climate, 2012
Aim: We present evidence for finite magnetic helicity density in the heliosphere and numerical models thereof, and relate it to the magnetic field properties of the dynamo in the solar convection zone.
Mitra Dhrubaditya, Brandenburg Axel, Warnecke Jörn   +2 more
doaj   +1 more source

Investigating Variations in Solar Differential Rotation by Helioseismology

The Astrophysical Journal
Helioseismic signatures of dynamo waves have recently been discovered in variations of the solar differential rotation, offering valuable insights into the type of dynamo mechanism operating in the solar convection zone. To characterize these variations,
Krishnendu Mandal, Alexander G. Kosovichev, Valery V. Pipin, Sylvain G. Korzennik   +3 more
doaj   +1 more source

An advective solar-type dynamo without the

, 2009
Context. Most solar and stellar dynamo models use the $\alpha\Omega$ scenario where the magnetic field is generated by the interplay between differential rotation (the Ω effect) and a mean electromotive force due to helical turbulent convection flows ...
N. Seehafer, Pipin, Valerij V., V. V. Pipin, Seehafer, Norbert (Prof. Dr.)   +3 more
core   +1 more source

Long-term solar activity and its implications to the heliosphere, geomagnetic activity, and the Earth’s climate

Journal of Space Weather and Space Climate, 2013
The Sun’s long-term magnetic variability is the primary driver of space climate. This variability is manifested not only in the long-observed and dramatic change of magnetic fields on the solar surface, but also in the changing solar radiative output ...
Tanskanen Eija, Nandy Dibyendu, Manoharan Periasamy, Mursula Kalevi, Verronen Pekka   +4 more
doaj   +1 more source

The Extended Solar Cycle: Muddying the Waters of Solar/Stellar Dynamo Modeling or Providing Crucial Observational Constraints?

Frontiers in Astronomy and Space Sciences, 2018
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.
Abhishek K. Srivastava, Scott W. McIntosh, N. Arge, Dipankar Banerjee, Mausumi Dikpati, Bhola N. Dwivedi, Madhulika Guhathakurta, B.B. Karak, B.B. Karak, Robert J. Leamon, Robert J. Leamon, Shibu K. Matthew, Andres Munoz-Jaramillo, D. Nandy, Aimee Norton, L. Upton, S. Chatterjee, Rakesh Mazumder, Yamini K. Rao, Rahul Yadav   +19 more
doaj   +1 more source

Two-dimensional magnetohydrodynamic turbulence in the small magnetic Prandtl number limit

, 2012
In this paper we introduce a new method for computations of two-dimensional magnetohydrodynamic (MHD) turbulence at low magnetic Prandtl number $\Pra=\nu/\eta$.
Tobias, Steve, Dritschel, David Gerard
core   +1 more source

The kinematic theory of solar dynamo

, 2003
Generation of the Sun's magnetic fields by self-inductive processes in the solar electrically conducting interior, the solar dynamo theory, is a fundamentally important subject in astrophysics.
Liao, XH, Zhang, KK
core