scholarly journals 22 Year Solar Magnetic Cycle and its relation to Convection Zone Dynamics

2018 ◽  
Vol 13 (S340) ◽  
pp. 9-10 ◽  
Author(s):  
Kiran Jain ◽  
Sushanta Tripathy ◽  
Rudolf Komm ◽  
Frank Hill ◽  
Rosaria Simoniello
Keyword(s):  
Convection Zone ◽  
Magnetic Cycle ◽  
Solar Magnetic Cycle ◽  
Local Properties ◽  
Global And Local

AbstractUsing continuous observations for 22 years from ground-based network GONG and space-borne instruments MDI onboard SoHO and HMI onboard SDO, we report both global and local properties of the convection zone and their variations with time.

Mechanism of Cyclically Polarity Reversing Solar Magnetic Cycle as a Cosmic Dynamo

2000 ◽  
Vol 179 ◽  
pp. 365-371
Author(s):  
Hirokazu Yoshimura
Keyword(s):  
Magnetic Field ◽  
Solar Cycle ◽  
Convection Zone ◽  
Dimensional Space ◽  
Solar Dynamo ◽  
Magnetic Cycle ◽  
Plasma Flows ◽  
Flux Tubes ◽  
Solar Magnetic Cycle ◽  
Dynamo Mechanism

Abstractwe briefly describe historical development of the concept of solar dynamo mechanism that generates electric current and magnetic field by plasma flows inside the solar convection zone. The dynamo is the driver of the cyclically polarity reversing solar magnetic cycle. The reversal process can easily and visually be understood in terms of magnetic field line stretching and twisting and folding in three-dimensional space by plasma flows of differential rotation and global convection under influence of Coriolis force. This process gives rise to formation of a series of huge magnetic flux tubes that propagate along iso-rotation surfaces inside the convection zone. Each of these flux tubes produces one solar cycle. We discuss general characteristics of any plasma flows that can generate magnetic field and reverse the polarity of the magnetic field in a rotating body in the Universe. We also mention a list of problems which are currently being disputed concerning the solar dynamo mechanism together with observational evidences that are to be constraints as well as verifications of any solar cycle dynamo theories of short and long term behaviors of the Sun, particularly time variations of its magnetic field, plasma flows, and luminosity.

scholarly journals Rotation of the solar convection zone from helioseismology

2006 ◽  
Vol 2 (S239) ◽  
pp. 393-404 ◽  
Author(s):  
Jørgen Christensen-Dalsgaard
Keyword(s):  
Solar Cycle ◽  
Convection Zone ◽  
Periodic Variation ◽  
Solar Interior ◽  
Slow Rotation ◽  
Magnetic Cycle ◽  
Solar Convection Zone ◽  
Zonal Flows ◽  
Solar Convection ◽  
Solar Magnetic Cycle

AbstractHelioseismology has provided very detailed inferences about rotation of the solar interior. Within the convection zone the rotation rate roughly shares the latitudinal variation seen in the surface differential rotation. The transition to the nearly uniformly rotating radiative interior takes place in a narrow tachocline, which is likely important to the operation of the solar magnetic cycle. The convection-zone rotation displays zonal flows, regions of slightly more rapid and slow rotation, extending over much of the depth of the convection zone and converging towards the equator as the solar cycle progresses. In addition, there is some evidence for a quasi-periodic variation in rotation, with a period of around 1.3 yr, at the equator near the bottom of the convection zone.

scholarly journals The new approach to the mechanism of solar magnetic cycle

2004 ◽  
Vol 2004 (IAUS223) ◽  
pp. 143-144 ◽  
Author(s):  
A. A. Solov'ev ◽  
E. A. Kiritchek
Keyword(s):  
Magnetic Cycle ◽  
New Approach ◽  
Solar Magnetic Cycle

scholarly journals Quasi-periodic changes in the 3D solar anisotropy of Galactic cosmic rays for 1965–2014

2017 ◽  
Vol 609 ◽  
pp. A32 ◽  
Author(s):  
R. Modzelewska ◽  
M. V. Alania
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
Solar Activity ◽  
Solar Cycle ◽  
Cosmic Rays ◽  
Ecliptic Plane ◽  
Galactic Cosmic Rays ◽  
Magnetic Cycle ◽  
The North ◽  
Solar Magnetic Cycle

Aims. We study features of the 3D solar anisotropy of Galactic cosmic rays (GCR) for 1965−2014 (almost five solar cycles, cycles 20−24). We analyze the 27-day variations of the 2D GCR anisotropy in the ecliptic plane and the north-south anisotropy normal to the ecliptic plane. We study the dependence of the 27-day variation of the 3D GCR anisotropy on the solar cycle and solar magnetic cycle. We demonstrate that the 27-day variations of the GCR intensity and anisotropy can be used as an important tool to study solar wind, solar activity, and heliosphere. Methods. We used the components Ar, Aϕ and At of the 3D GCR anisotropy that were found based on hourly data of neutron monitors (NMs) and muon telescopes (MTs) using the harmonic analyses and spectrographic methods. We corrected the 2D diurnal (~24-h) variation of the GCR intensity for the influence of the Earth magnetic field. We derived the north-south component of the GCR anisotropy based on the GG index, which is calculated as the difference in GCR intensities of the Nagoya multidirectional MTs. Results. We show that the behavior of the 27-day variation of the 3D anisotropy verifies a stable long-lived active heliolongitude on the Sun. This illustrates the usefulness of the 27-day variation of the GCR anisotropy as a unique proxy to study solar wind, solar activity, and heliosphere. We distinguish a tendency of the 22-yr changes in amplitude of the 27-day variation of the 2D anisotropy that is connected with the solar magnetic cycle. We demonstrate that the amplitudes of the 27-day variation of the north-south component of the anisotropy vary with the 11-yr solar cycle, but a dependence of the solar magnetic polarity can hardly be recognized. We show that the 27-day recurrences of the GG index and the At component are highly positively correlated, and both are highly correlated with the By component of the heliospheric magnetic field.

scholarly journals System dynamics models as decision-making tools in agritourism

Agricultura ◽  
2016 ◽  
Vol 13 (1-2) ◽  
pp. 5-10 ◽  
Author(s):  
Tadeja Jere Jakulin
Keyword(s):  
Decision Making ◽  
System Dynamics ◽  
Social Factors ◽  
Qualitative And Quantitative ◽  
Causal Connections ◽  
Local Properties ◽  
Dynamics Models ◽  
Global And Local ◽  
And Training ◽  
Develop System

Abstract Agritourism as a type of niche tourism is a complex and softly defined phaenomenon. The demands for fast and integrated decision regarding agritourism and its interconnections with environment, economy (investments, traffic) and social factors (tourists) is urgent. Many different methodologies and methods master softly structured questions and dilemmas with global and local properties. Here we present methods of systems thinking and system dynamics, which were first brought into force in the educational and training area in the form of different computer simulations and later as tools for decision-making and organisational re-engineering. We develop system dynamics models in order to present accuracy of methodology. These models are essentially simple and can serve only as describers of the activity of basic mutual influences among variables. We will pay the attention to the methodology for parameter model values determination and the so-called mental model. This one is the basis of causal connections among model variables. At the end, we restore a connection between qualitative and quantitative models in frame of system dynamics.

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