MARC details
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03552nam a2200253Ia 4500 |
| 003 - CONTROL NUMBER IDENTIFIER |
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| control field |
IN-BaIIA |
| 005 - DATE AND TIME OF LATEST TRANSACTION |
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| control field |
20211110160116.0 |
| 008 - FIXED-LENGTH DATA ELEMENTS--GENERAL INFORMATION |
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| fixed length control field |
211028s9999 xx 000 0 eng d |
| 040 ## - CATALOGING SOURCE |
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| Transcribing agency |
IIA Library |
| 100 ## - MAIN ENTRY--PERSONAL NAME |
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| Personal name |
Sen, Samrat |
| 9 (RLIN) |
37310 |
| Relator term |
Author |
| 245 #0 - TITLE STATEMENT |
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| Title |
Twisted Magnetic Fluxtubes in the Sun |
| Remainder of title |
a thesis submitted for the degree of philosophy in the department of physics, Pondicherry University, Puduecheery |
| Statement of responsibility, etc. |
Samrat Sen |
| Medium |
[Ph.D Thesis] |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. |
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| Place of publication, distribution, etc. |
Bangalore |
| Name of publisher, distributor, etc. |
Indian Institute of Astrophysics |
| Date of publication, distribution, etc. |
2020 |
| 300 ## - PHYSICAL DESCRIPTION |
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| Extent |
xx, 208p. |
| 500 ## - GENERAL NOTE |
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| General note |
Ph.D. Thesis, Pondicherry University, Puducherry |
| 502 ## - DISSERTATION NOTE |
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| Degree type |
Doctor of Philosophy |
| Name of granting institution |
Pondicherry University, Puducherry |
| Year degree granted |
2020 |
| 520 ## - SUMMARY, ETC. |
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| Summary, etc. |
The study of magnetic fluxtubes is a very important aspect as it plays an important<br/>role in several astrophysical phenomena in the solar atmosphere. Thus, it is very<br/>important to understand the properties and structures of the magnetic configuration<br/>and thermodynamic quantities of the fluxtubes. In this Thesis, we construct two<br/><br/>different classes of fluxtube models with twisted magnetic fields by solving the Grad-<br/>Shafranov equation (GSE) semi-analytically. We also calculate the energy distribution<br/><br/>of a braided system of magnetic field lines using the Self-Organized Criticality (SOC)<br/>model.<br/><br/>The fluxtube models we build are in magnetohydrostatic (MHS) equilibria for an ax-<br/>isymmetric geometry, spanning from the photosphere to the lower part of the transition<br/><br/>region within a realistic stratified solar atmosphere subject to solar gravity. We as-<br/>sume a general quadratic expression of the magnetic flux function for the gas pressure<br/><br/>and poloidal current and solve the GSE analytically. One solution is a combination<br/>of a homogeneous and a particular part where the former is separable by a Coulomb<br/><br/>function in r and exponential in z, while the particular part is an open configura-<br/>tion that has no z dependence. The other fluxtube model can be branched out into<br/><br/>open and closed field solutions by using a self-similar formulation with different profile<br/>functions and incorporating stratified solar gravity to maintain the magnetohydrostatic<br/>equilibria, which is a modification of earlier self-similar models by a twist. We study<br/><br/>the admitted parameter space that is consistent with the conditions in the solar at-<br/>mosphere and derive magnetic and the thermodynamic structures inside the fluxtubes<br/><br/>that are reasonably consistent with the photospheric magnetic bright points (MBPs)<br/>for both open and closed field Coulomb function and self-similar models as estimated<br/>from observations and simulations. The obtained open fluxtube solutions can be used<br/>as the background conditions for the numerical simulations for the study of the wave propagation through the fluxtubes. The closed field solutions can be used to construct<br/>realistic magnetic canopies in the solar atmosphere.<br/><br/>We estimate winding number distributions of braided topologies. We also calculate the<br/>power-law index of the energy distribution for the solar radio flare events on 14 February<br/>2011, and 11 March 2011, captured by Gauribidanur Radio Telescope, and compare<br/>the theoretical prediction of the power-law index with the observational estimate. |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name entry element |
Fluxtube models |
| 9 (RLIN) |
37311 |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name entry element |
Magnetic fields |
| 9 (RLIN) |
530 |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name entry element |
Solor Atmosphere |
| 9 (RLIN) |
37312 |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM |
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| Topical term or geographic name entry element |
Sun |
| 9 (RLIN) |
1200 |
| 700 ## - ADDED ENTRY--PERSONAL NAME |
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| Personal name |
Arun Mangalam |
| Relator term |
Supervisor |
| 9 (RLIN) |
37029 |
| 856 ## - ELECTRONIC LOCATION AND ACCESS |
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| Uniform Resource Identifier |
<a href="http://prints.iiap.res.in/handle/2248/7523">http://prints.iiap.res.in/handle/2248/7523</a> |
| Link text |
Click Here to Access eThesis |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) |
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| Koha item type |
Thesis & Dissertations |
| Source of classification or shelving scheme |
Universal Decimal Classification |
