From the Outer Heliosphere to the Local Bubble: Comparisons of New Observations with Theory

ISBN-13: 9781489994585 / Angielski / Miękka / 2014 / 478 str.

J L Linsky;V V Izmodenov;E Mobius

Opis

Knowledge about the outer heliosphere and the interstellar medium, which were long treated as two separate fields, has improved dramatically over the past 25 years as a consequence of recent developments: The discovery of interstellar pickup ions and neutral helium inside the heliosphere, the determination of the interstellar hydrogen distribution in the heliosphere obtained using backscattered solar Lyman-alpha radiation, the prediction and subsequent detection of the hydrogen wall just outside of the heliopause, the development of detailed global models for the interaction of solar wind plasma with the interstellar medium, and most recently, direct in-situ plasma and field measurements inside of the heliosheath. At the same time, our understanding of the nearby galactic environment, including the composition and dynamics of the warm gas clouds and hot gas in the local bubble, has benefited greatly from absorption-line spectroscopy using nearby stars as background sources and dynamic modeling. The present volume provides a synopsis of these developments organised into seven sections: Dominant physical processes in the termination shock and heliosheath, three-dimensional shape and structure of the dynamic heliosphere, relation of the plasmas and dust inside and outside of the heliosphere, origin and properties of the very local interstellar medium, energy and pressure equilibria in the local bubble, physical processes in the multiphase interstellar medium inside of the local bubble, and the roles that magnetic fields play in the outer heliosphere and the local bubble. The last theme is probably the most basic of all as magnetic fields play important roles in most of the phenomena discussed here. The volume concludes with four papers providing the "big picture" by looking at the time evolution of both the heliosphere and the local bubble, looking beyond the local bubble, and finally addressing the challenges in modeling the interface between the two media.

Spis treści

Foreword.- Dedication to George Gloeckler.- Section I: What are the Three-Dimensional Shape and Structure of the Dynamic Heliosphere?.- The Solar Wind in the Outer Heliosphere.- Constraints on the Structure of the Heliosphere Interface Based on Lyman-Alpha Absorption Spectra.- Influence of the Interstellar Magnetic Field and Neutrals on the Shape of the Outer Heliosphere.- Role of the Interstellar Magnetic Field in Voyager 1 and 2 Asymmetries.- The Dynamic Heliosphere Splinter Group.- Section II: What are the Dominant Physical Processes in the Termination Shock and Inner Heliosheath?.- The Heliospheric Magnetic Field and its Extension to the Inner Heliosheath.- Pickup Ion Acceleration and Evolution in the Heliosheath and Termination Shock.- Energetic Neutral Atom (ENA) Imaging of the Inner Heliosheath.- Section III: How are the ISM Inside and Outside of the Heliosphere Related?.- Inferences of the Local Interstellar Parameters from Observations Inside the Heliosphere.- Backscattered Lyman-Alpha Observations From SOHO/SWAN and Voyagers.- Composition of Interstellar Neutrals in the Inner Heliosheath at 100 AU.- Neutral H Density at the Termination Shock.- How are the ISM Inside and Outside of the Heliosphere Related.- Section IV: What are the Energy and Pressure Balances in the Local Bubble?.- Pressure, Ionization, and Energy Balance in the Local Bubble.- Charge Transfer in the Inner Heliosphere and Local Bubble.- Revising the Local Bubble Model Due to Solar Wind Charge Exchange X-Ray Emission.- Warm and Hot Gas in the Local ISM.- What Can be Learned from X-Ray Spectroscopy Concerning Hot Gas in the Local Bubble and Charge Exchange Processes?.- Section V: What Physical Processes Drive the Multiphase Interstellar Medium in the Local Bubble?.- What Physical Processes Drive the Interstellar Medium in the Local Bubble: Introduction.- Turbulence in the Local ISM and Local Bubble.- Exotic Clouds in the Local Interstellar Medium.- The Local Bubble Debate.- Section VI: What are the Origin and Physical Properties of the Clump of Very Local ISM?.- The Origins and Physical Properties of the Complex of Local Interstellar Clouds.- Physical Properties of the Local ISM.- Perspectives on Interstellar Dust Inside and Outside of the Heliosphere.- Dust Inside and Outside of the Heliosphere.- Section VII: What are the Roles that Magnetic Fields Play in the Local Bubble and Its Constituents?.- Obtaining Spectra of Turbulent Velocity from Observations.- Properties and Selected Implications of Magnetic Turbulence for Interstellar Medium, Local Bubble, and Solar Wind.- Section VIII: The Emerging Broad Picture.- The Heliosphere in Time.- Origin and Evolution of the Local Bubble and Local ISM.- Origin of the Local Bubble.- Kinetic Fluid Perspective in Modeling in the Heliosphere-Interstellar Medium Interface.- Section IX: Summary.- What Have We Learned?.

Blurb

The present volume provides a state-of-the-art synopsis of our current understanding of the dynamic heliosphere, the interstellar clouds surrounding it, the wider neighborhood of the local bubble, and their complex interactions. It is written by many of the researchers who have made key discoveries, observations, and modeling efforts that have led to dramatic progress in the field over the past 25 years. Thus the book is an essential research tool for space scientists and astronomers alike, including graduate students for whom it presents a single-point entrance into this complex yet fascinating field.