World Library  


Add to Book Shelf
Flag as Inappropriate
Email this Book

Self-organized Criticality in Solar Flares: a Cellular Automata Approach : Volume 17, Issue 4 (22/07/2010)

By Morales, L. F.

Click here to view

Book Id: WPLBN0003977693
Format Type: PDF Article :
File Size: Pages 6
Reproduction Date: 2015

Title: Self-organized Criticality in Solar Flares: a Cellular Automata Approach : Volume 17, Issue 4 (22/07/2010)  
Author: Morales, L. F.
Volume: Vol. 17, Issue 4
Language: English
Subject: Science, Nonlinear, Processes
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2010
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

APA MLA Chicago

Charbonneau, P., & Morales, L. F. (2010). Self-organized Criticality in Solar Flares: a Cellular Automata Approach : Volume 17, Issue 4 (22/07/2010). Retrieved from http://hawaiilibrary.net/


Description
Description: Canadian Space Agency, Saint-Hubert, Quebec, Canada. We give an overview of a novel lattice-based avalanche model that reproduces well a number of observed statistical properties of solar flares. The anisotropic lattice is defined as a network of vertically-connected nodes subjected to horizontal random displacements mimicking the kinks introduced by random motions of the photospheric footpoints of magnetic fieldlines forming a coronal loop. We focus here on asymmetrical driving displacements, which under our geometrical interpretation of the lattice correspond to a net direction of twist of the magnetic fieldlines about the loop axis. We show that a net vertical electrical current density does build up in our lattice, as one would expect from systematic twisting of a loop-like magnetic structure, and that the presence of this net current has a profound impact on avalanche dynamics. The presence of an additional energy reservoir tends to increase the mean energy released by avalanches, and yield a probability distribution of released energy in better agreement with observational inferences than in its absence. Symmetrical driving displacements are in better conceptual agreement with a random shuffling of photospheric footpoint, and yield a power-law distribution of energy release with exponent larger than 2, as required in Parker's nanoflare model of coronal heating. On the other hand, moderate asymmetrical driving generate energy distribution exponents that are similar to those obtained from SOHO EUV observations.

Summary
Self-organized criticality in solar flares: a cellular automata approach

Excerpt
Aschwanden, M. J.: Physics of the solar corona, Springer-Praxis Books in Astronomy and Planetary Sciences, Chichester, UK, 2006.; Charbonneau, P., McIntosh, S. W., Liu, H.-L., and Bogdan, T. J.: Avalanche models for solar flares (Invited Review), Sol. Phys., 203, 321–353, 2001.; Aschwanden, M. J., Tarbell, T. D., Nightingale, R. W., Schrijver, C. J., Title, A., Kankelborg, C. C., Martens, P., and Warren, H. P.: Time Variability of the Quiet Sun Observed with TRACE. II. Physical Parameters, Temperature Evolution, and Energetics of Extreme-Ultraviolet Nanoflares, Astrophys. J., 535, 1047–1065, 2000.; Dahlburg, R. B., Klimchuk, J. A., and Antiochos, S. K.: An Explanation for the Switch-On Nature of Magnetic Energy Release and Its Application to Coronal Heating, Astrophs. J., 622, 1191–1201, 2005.; De Moortel, I., Parnell, C. E., and Hood, A. W.: Determination of coronal loop properties from trace observations, Sol. Phys., 215, 69–86, 2003.; Georgoulis, M. K. and Vlahos, L.: Variability of the occurrence frequency of solar flares and the statistical flare, Astron. Astrophys., 336, 721–734, 1998.; Gomez, D.: Heating of the Solar Corona, Fundamentals of Cosmic Physics, 14(2–3), 131–233, 1990.; Isliker, H., Anastasiadis, A., and Vlahos, L.: MHD consistent cellular automata (CA) models. I. Basic features, Astron. Astrophys., 363, 1134–1144, 2000.; Klimchuk, J. A.: On Solving the Coronal Heating Problem, Sol. Phys., 234, 41–77, 2006.; Lopez Fuentes, M. C., Klimchuk, J. A., and Démoulin, P.: The Magnetic Structure of Coronal Loops Observed by TRACE, Astrophys. J., 639, 459–474, 2006.; Lu, E. T and Hamilton, R. J.: Avalanches and the distribution of solar flare, Astrophys. J., 380, L89–L92, 1991.; Mandrini, C. H., Demoulin, P., and Klimchuk, J. A.: Magnetic Field and Plasma Scaling Laws: Their Implications for Coronal Heating Models, Astrophys. J., 530, 999–1015, 2000.; Morales, L. F. and Charbonneau, P.: Self-organized Critical Model of Energy Release in an Idealized Coronal Loop, Astrophys. J., 682(1), 654–666, 2008.; Morales, L. F. and Charbonneau, P.: Geometrical Properties of Avalanches in a Pseudo-3D Coronal Loop, Astrophys. J., 698(2), 1893–1902, 2009.; Parker, E. N.: Magnetic Neutral Sheets in Evolving Fields – Part Two – Formation of the Solar Corona, Astrophys. J., 264, 642–647, 1983.; Parker, E. N.: Nanoflares and the solar X-ray corona, Astrophys. J., 330, 474–479, 1988.; Podladchikova, O. and Lefebre, B.: Lattice models for solar flares and coronal heating (Invited Review), Solar Actvity and its Magnetic Origin, Proc. IAU Symposium, 233, 481–488, 2006.; Uritsky, V., Paczuki, M., Davila, J. M., and Jones, S. I.: Coexistence of Self-Organized Criticality and Intermittent Turbulence in the Solar Corona, Phys. Rev. Lett., 99(2), 25001–25001-4, 2007.

 

Click To View

Additional Books


  • Multifractality, Imperfect Scaling and H... (by )
  • Loading Rates in California Inferred fro... (by )
  • Excitation of Kinetic Alfvén Turbulence ... (by )
  • Current Challenges for Pre-earthquake El... (by )
  • A Minimalist Model of Characteristic Ear... (by )
  • Solitary Wave in a Burridge-knopoff Mode... (by )
  • Polar Spacecraft Observations of the Tur... (by )
  • Limitations of Hall Mhd as a Model for T... (by )
  • How Much Does Inclusion of Non-linearity... (by )
  • Combining Inflation-free and Iterative E... (by )
  • Use of the Breeding Technique to Estimat... (by )
  • Whistler Oscillitons Revisited: the Role... (by )
Scroll Left
Scroll Right

 



Copyright © World Library Foundation. All rights reserved. eBooks from Hawaii eBook Library are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.