The Galactic Magnetic Field and Cosmic Rays

The structure of the magnetic field of the Galaxy and other spiral systems and the inseparable problem of the origin of cosmic rays are examined: (1) A variety of evidence is used to show that the galactic field extends far beyond the disk and connects the disk field with a general field fixed in the local system of galaxies. (2) The coronal field extends beyond 10 kpc as an oblique helix which is constantly expanding, and has partially force�free characteristics.

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The Origin and Dynamical Effects of the Magnetic Fields and Cosmic Rays in the Disk of the Galaxy

Symposium - International Astronomical Union ◽

10.1017/s0074180900004873 ◽

1970 ◽

Vol 39 ◽

pp. 168-183

Author(s):

E. N. Parker

Keyword(s):

Magnetic Field ◽

Cosmic Rays ◽

Magnetic Fields ◽

Dynamical Behavior ◽

Cosmic Ray ◽

Interested Reader ◽

Written Text ◽

The Galaxy ◽

Basic Ideas ◽

The Magnetic Field

The topic of this presentation is the origin and dynamical behavior of the magnetic field and cosmic-ray gas in the disk of the Galaxy. In the space available I can do no more than mention the ideas that have been developed, with but little explanation and discussion. To make up for this inadequacy I have tried to give a complete list of references in the written text, so that the interested reader can pursue the points in depth (in particular see the review articles Parker, 1968a, 1969a, 1970). My purpose here is twofold, to outline for you the calculations and ideas that have developed thus far, and to indicate the uncertainties that remain. The basic ideas are sound, I think, but, when we come to the details, there are so many theoretical alternatives that need yet to be explored and so much that is not yet made clear by observations.

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The Magnetic Field of the Sun: An Object Lesson

Symposium - International Astronomical Union ◽

10.1017/s0074180900189375 ◽

1990 ◽

Vol 140 ◽

pp. 1-12

Author(s):

E. N. Parker

Keyword(s):

Magnetic Field ◽

Small Scale ◽

The Sun ◽

Gaseous Disk ◽

Galactic Field ◽

The Galaxy ◽

Object Lesson ◽

Mass Ejection ◽

Solar Field ◽

The Magnetic Field

The magnetic field of the sun is created by a magnetohydrodynamic dynamo under conditions bearing some qualitative similarities to the apparent generation of the galactic field in the gaseous disk of the galaxy. There is a similarity, too, in the extension of bipolar lobes of the solar field above the surface of the sun and the extension of bipolar lobes of the galactic field outward from both sides of the disk. Hence one can learn a lot about the expected origin and activity of the galactic field by studying the behavior of the magnetic field of the sun. In particular, the mysteries associated with the “simple” circumstances of the origin of the solar magnetic field far below the surface are no less than the mysteries in the theoretical origin of the galactic field, where there is so little direct observation of the small scale motions and magnetic fields. There is reason to think that the activity of the magnetic field of the sun, producing prominences, flares and X-ray corona, a solar wind, and coronal mass ejection may all have counter parts in the activity of the galactic field above the surface of the gaseous disk.

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Progress in the Global Modeling of the Galactic Magnetic Field

EPJ Web of Conferences ◽

10.1051/epjconf/201921004005 ◽

2019 ◽

Vol 210 ◽

pp. 04005 ◽

Cited By ~ 2

Author(s):

Michael Unger ◽

Glennys Farrar

Keyword(s):

Magnetic Field ◽

Cosmic Rays ◽

Synchrotron Emission ◽

Ultrahigh Energy ◽

Galactic Magnetic Field ◽

Global Modeling ◽

Emission Data ◽

The Galaxy ◽

Ultrahigh Energy Cosmic Rays ◽

The Impact

We discuss the global modeling of the properties of the Galactic Magnetic Field (GMF). Several improvements and variations of the model of the GMF from Jansson & Farrar (2012) (JF12) are investigated in an analysis constrained by all-sky rotation measures of extragalactic sources and polarized and unpolarized synchrotron emission data from WMAP and Planck. We present the impact of the investigated model variations on the propagation of ultrahigh-energy cosmic rays in the Galaxy

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The Galaxy Magnetic Field

International Astronomical Union Colloquium ◽

10.1017/s0252921100067385 ◽

1977 ◽

Vol 45 ◽

pp. 73-75 ◽

Cited By ~ 37

Author(s):

A.A. Ruzmaikin

Keyword(s):

Magnetic Field ◽

Cosmic Rays ◽

Magnetic Fields ◽

Local Dynamics ◽

The Galaxy ◽

The Magnetic Field

The origin and dynamics of magnetic fields depend crucially on the dynamics of a gas in the Galaxy. In turn the magnetic field is needed to isotropize the cosmic rays (the influence on chemistry) and is of importance for the formation of stars (local dynamics). Thus the appearance of this topic at the Colloquium is justified.

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Effect of the regular galactic magnetic field on the propagation of galactic cosmic rays in the Galaxy

10.22323/1.236.0491 ◽

2016 ◽

Author(s):

Shoko Miyake ◽

Shohei Yanagita

Keyword(s):

Magnetic Field ◽

Cosmic Rays ◽

Galactic Cosmic Rays ◽

Galactic Magnetic Field ◽

The Galaxy

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The effects of drift and winds on the propagation of Galactic cosmic rays

Monthly Notices of the Royal Astronomical Society ◽

10.1093/mnras/stab091 ◽

2021 ◽

Author(s):

A AL-Zetoun ◽

A Achterberg

Keyword(s):

Magnetic Field ◽

Cosmic Rays ◽

Field Model ◽

Galactic Cosmic Rays ◽

Galactic Magnetic Field ◽

Galactic Wind ◽

Wind Speeds ◽

Field Diffusion ◽

The Galaxy ◽

Magnetic Field Model

Abstract We study the effects of drift motions and the advection by a Galactic wind on the propagation of cosmic rays in the Galaxy. We employ a simplified magnetic field model, based on (and similar to) the Jansson-Farrar model for the Galactic magnetic field. Diffusion is allowed to be anisotropic. The relevant equations are solved numerically, using a set of stochastic differential equations. Inclusion of drift and a Galactic wind significantly shortens the residence time of cosmic rays, even for moderate wind speeds.

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Measuring ISM fields using Pulsars

Proceedings of the International Astronomical Union ◽

10.1017/s1743921309030026 ◽

2008 ◽

Vol 4 (S259) ◽

pp. 15-24

Author(s):

Aristeidis Noutsos

Keyword(s):

Magnetic Field ◽

Magnetic Fields ◽

Continuous Improvement ◽

Clear Picture ◽

Galactic Magnetic Field ◽

Analysis Methods ◽

The Galaxy ◽

Invaluable Tool ◽

The Magnetic Field

AbstractThe sample of available Galactic pulsar rotation measures has proven an invaluable tool for measuring the direction and magnitude of the interstellar magnetic fields of our Galaxy. In this review, I present highlights of recent efforts to measure and map the Galactic magnetic field using pulsars. I give an overview of the analysis methods that were used by previous authors and underline the key results that have given us a clear picture of the magnetic field in certain regions of the Galaxy. This review also lays out the limitations of the present analysis methods and the observational difficulties that have so far hindered the study of the Galactic magnetic field with pulsars. Despite these difficulties, the continuous discovery of new pulsars in more and more sensitive surveys offer a continuous improvement on the existing knowledge of the Galactic magnetic field.

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Observing the galactic magnetic field

Symposium - International Astronomical Union ◽

10.1017/s0074180900101251 ◽

1967 ◽

Vol 31 ◽

pp. 375-380

Author(s):

H. C. van de Hulst

Keyword(s):

Magnetic Field ◽

Fair Agreement ◽

Solar Neighbourhood ◽

Galactic Magnetic Field ◽

The Magnetic Field

Various methods of observing the galactic magnetic field are reviewed, and their results summarized. There is fair agreement about the direction of the magnetic field in the solar neighbourhood:l= 50° to 80°; the strength of the field in the disk is of the order of 10-5gauss.

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