The Problem of Coronal Heating: A Rosetta Stone for Electrodynamic Coupling in Cosmic Plasmas

ISBN-13: 9783031462726 / Angielski

Philip Judge; James A. Ionson

Spis treści

Preface

 

1 Introduction

1.1 This book in a nutshell 

1.2 Hot plasmas and electrodynamic coupling 

1.3 An old puzzle

1.4 A very short history

1.5 Reductio ad minimum

1.6 First inferences

1.7 The nature of the heating problem

1.8 One Sun, multiple coronae

Chapter summary 

 

2 Magneto-hydrodynamics

2.1 Underlying assumptions, for better and worse

2.2 Ideal MHD

2.3 Equations of motion

2.4 Coronal magnetism and topology

2.5 Flux freezing and a useful one-dimensional picture

2.6 Electrodynamic coupling

2.7 Two conjectures

Chapter summary 

 

3 Challenges

3.1 Disparate scales, diverse regimes

3.2 Navigating the chromosphere

3.3 Remote sensing

3.4 Stochastic behavior

3.5 Turbulence

3.6 Theoretical and numerical challenges

3.7 Ill-posedness

3.8 Changing the scene of the crime

3.9 The poorly understood chromosphere-corona interface

Chapter summary 

 

4 Methodologies

4.1 Is there a heating problem?

4.2 Is there a coronal heating problem?

4.3 Methods addressing the coronal heating problem

4.4 Refutation of non-magnetic processes

4.5 Accelerated particles do not heat the quiet corona

4.6 Resonant absorption: an ideal linear model

4.7 Parker’s fundamental theorem of magnetostatics

4.8 Nanoflares

4.9 From MHD to dissipation

4.10 Philosophical considerations

Chapter summary 

 

5 Seeking the Sun’s Achilles heels

5.1 Power spectra and MHD turbulence

5.2 Scales of dissipation and the narrowest coronal structures

5.3 “Fuzziness” of hot plasma loops

5.4 Is coronal thermal structure unreasonably well-organized?

5.5 Coronal oscillations

5.6 Why are only some magnetic loops loaded with dense, bright plasma?

5.7 Clues from transient changes

5.8 Stable or unstable current sheets?

5.9 High signal-to-noise coronal line profiles

5.10 Waves in inhomogeneous plasmas

5.11 Remote sensing of kinetic coronal physics

5.12 Trouble with “the transition region”

Chapter summary 

 

6 Fresh approaches

6.1 A perspective on methodologies

6.2 How does the chromosphere control coronal physics?

6.3 Novel instrumentation

Chapter summary 

 

Appendices

 

7 Closing thoughts

O autorze

Philip Judge began his higher education in physics and choral music as an undergraduate of Magdalen College of Oxford University in 1978. He was awarded a B.A. in physics in 1981 and, in 1985, a D. Phil. degree for his investigation of the outer atmospheres of late-type giant stars.  Since 1991, he has worked as a scientist at the National Center for Atmospheric Research in Boulder, Colorado.  He was appointed as a Senior Scientist at NCAR in 2004, and is currently working on understanding the basic physics of the Sun's atmosphere. 
Driven to mentor and learn from young scientists, his research papers have a strong pedagogical slant. Often they raise more questions than answers.  His 2020 book, "The Sun" in the "Very Short Introduction" series from Oxford University Press, has been well received by interested lay-persons and professionals alike.  Philip has enjoyed many sabbaticals and visits in universities across the globe, privileged to work with many students and staff.  His research focuses on the foundations upon which our understanding of the Sun and stars are built, from spectroscopy, spectropolarimetry and radiation transport, to mechanisms by which electrodynamic coupling heats and drives the plasmas surrounding gravitationally bound astrophysical objects.  He is an avid fly-tier and fly-fisherman, a lover of international cricket and rugby, a partially successful opera singer, cancer survivor, and author of four fiction books devoted to the climate crisis.  He lives with Terri his ever-loving and patient wife of 34 years, with homes in Colorado and Scotland.

James A. Ionson was awarded a Ph.D. in theoretical plasma astrophysics from the University of Maryland in 1977 and was adjunct professor of physics there from 1978-1985 and Senior Scientist and Project Manager at NASA’s Goddard Space Flight Center.  During this time, he contributed significant solutions to the problem of electrodynamic coupling in astrophysical plasmas with special emphasis on our Sun.  His research was recognized and honored by the Maryland Academy of Sciences for “a major breakthrough in the heating of magnetically confined space plasmas”; Winner of the Harvard Smithsonian Observatory Award; and Winner of Scientific Distinction Award from the Dutch Organization for Scientific Research.  From 1985 to present Dr. Ionson is well known as a scientific and technology innovator and entrepreneur with Senior Executive positions in the Department of Defense managing more than $1 Billion investments in innovative science and technology; and was awarded the DoD/SDIO Outstanding Performance Award, Mission of the Year and Federal Top Manager Under Forty Awards by the Secretary of Defense.  After leaving the Government in 1988, Dr. Ionson was Chief Technology Officer of Polaroid, and subsequently CEO/Founder of numerous advanced technology companies. He is currently the CEO/Founder of JDC Inc which focuses on innovative Artificial Thinking and Telementoring technologies based upon issued patents that he has authored.

Blurb

This book reflects on 8 decades of research on one of the longest-standing unsolved problems in modern astrophysics: why does the Sun form a hot corona? The authors give a critical overview of the field and offer suggestions on how to bridge the chasm between what we can measure, and what we can calculate. They go back to basics to explain why the problem is difficult, where we have made progress and where we have not, to help the next generation of scientists devise novel techniques to crack such a long-lasting problem. A way forward is formulated centered around refutation, using Bayesian methods to propose and to try to reject hypotheses and models, and avoiding seduction by ``confirmation bias’’.

This book is aimed at physicists, students and researchers interested in understanding, learning from and solving the coronal heating problem, in an era of new dedicated facilities such as the Parker Solar Probe and the Daniel K. Inouye Solar Telescope.   

The book will appeal to those interested in understanding research methods and how they are changing in the modern academic environment, particular in astrophysics and Earth sciences where remote sensing is essential.