Physics Of The Inner Heliosheath
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Physics of the Inner Heliosheath
Author: American Institute of Physics
language: en
Publisher: American Institute of Physics
Release Date: 2006-10-16
All papers in this proceedings volume have been peer-reviewed. The solar wind is a tenuous ionized gas (plasma) that is continuously expelled from the Sunâs surface at supersonic speed. Somewhere around 100 astronomical units (100 times the distance from the Sun to the Earth) this flow becomes subsonic, and, in doing so, sets up a standing shock wave known as the termination shock. Beyond this shock is a region of subsonic, but very hot, plasma known as the inner heliosheath. In December of 2004, Voyager 1, one of two NASA satellites launched in 1977 to explore the solar system crossed the termination shock, and now finds itself inside the heliosheath. These proceedings provides several papers which analyze the Voyager data, as well as many theoretical papers which attempt to explain it. The IBEX mission, due for launch in 2008, will add to the pool of observational data by directly detecting energetic neutral atoms generated within the heliosheath. Included are a number of papers which focus on IBEX, along with many other papers covering heliosheath related topics, such as particle acceleration, shock physics, turbulence, dust and comets. The heliosheath represents a very young research area, with currently only limited data and a dynamic array of theoretical models.
From the Outer Heliosphere to the Local Bubble
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.
Physics of the Inner Heliosheath
Author: Jacob Heerikhuisen
language: en
Publisher: American Inst. of Physics
Release Date: 2006-10-16
This proceedings volume contains peer-reviewed papers that analyze and attempt to explain data about the heliosheath gathered from Voyager 1, one of two NASA satellites launched to explore the solar system. In addition, it also includes a number of papers which focus on the upcoming IBEX mission, due for launch in 2008, which will add to the pool of observational data by directly detecting energetic neutral atoms generated within the heliosheath.