Primary Intelligence Asset

Ogilvie Magnetized Accretion Discs 1998

Declassified Public record OCR verified
INTEL

Executive Summary

This scientific paper explores how magnetic fields influence the movement and stability of swirling discs of matter, such as those found around stars or black holes. It specifically examines how magnetic forces can trigger instabilities that allow material to flow inward by creating turbulence within these rotating discs.
Analysis Confidence: High
ST_CODE: A61B89

System Metadata

Source ID

DOC-OGILVIE_

Process Date

8/9/2026

Integrity Hash

SHA256-xy2qqvn0v1...

Indexer Status

COMPLETE

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INVESTIGATIVE ANALYSIS

Summary

This scientific paper explores how magnetic fields influence the movement and stability of swirling discs of matter, such as those found around stars or black holes. It specifically examines how magnetic forces can trigger instabilities that allow material to flow inward by creating turbulence within these rotating discs.

Origin

The document was authored by G. I. Ogilvie of the University of Cambridge (Institute of Astronomy and the Department of Applied Mathematics and Theoretical Physics). It was published in the 'Monthly Notices of the Royal Astronomical Society' and sourced from the arXiv astrophysics preprint server.

Purpose

The research aimed to develop a mathematical framework for understanding waves and instabilities in magnetized accretion discs using ideal magnetohydrodynamics (MHD). It specifically sought to solve the problem of how angular momentum is transported in these discs, which is necessary for material to actually reach the central object.

Why It Matters

" While the primary subject is astrophysics, the study of Magnetohydrodynamics (MHD) and plasma instabilities is highly relevant to advanced energy projects such as Field-Reversed Configuration (FRC) fusion and plasma propulsion systems. The inclusion of this document on 'SecretMilitaryTechnology.com' suggests its theoretical models are being applied to high-energy density physics and aerospace programs involving stabilized plasma flows, which overlaps with the research interests of DARPA and Sandia National Laboratories. "

Key Claims

  • › The paper identifies the magnetorotational instability was originally described by Velikhov (1959) and Chandrasekhar (1960).
  • › It claims that in a weakly magnetized disc, the sound speed and Alfvén velocity are both of the order O(epsilon).
  • › The research states that for a centrifugally driven wind to be launched, the magnetic field lines must be inclined to the vertical by an angle greater than pi/6.
  • › The document cites Balbus & Hawley (1991) as providing a convincing mechanism for angular momentum transport via magnetorotational instability.
  • › The author, G. I. Ogilvie, was affiliated with the University of Cambridge, Madingley Road, at the time of publication.

Contribution to the Field

This document extends asymptotic mathematical methods to specifically classify the spectrum of waves and locate the stability boundaries of the magnetorotational instability in weakly magnetized thin discs.

External Primary Sources (3)

Verified external sources that corroborate the claims in this document.

patent
US Patent 9,947,420 B2 — Magnetic field plasma confinement for compact fusion power
conference 2019
Recent Achievements in the C-2W Field-Reversed Configuration Experiment — APS DPP19
TAE Technologies
paper 2019-06-05
Formation of hot, stable, long-lived field-reversed configuration plasmas on the C-2W device — Nuclear Fusion
H. Gota et al.

Full Transcript

Transcript

Page 1 of 4

INTRODUCTION

ar Xiv:astro-ph/9801306v1 29 Jan 1998 Mon. Not. R. Astron. Soc.000, 000–000 (1994)Printed 24 May 2021(MN plain T E X macros v1.6) Waves and instabilities in a differentially rotating disc containing a poloidal magnetic field G. I. Ogilvie 1,2 1 Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA 2 Department of Applied Mathematics and Theoretical Physics, University of Cambridge, Silver Street, Cambridge CB3 9EW

Cited In (1 references)

Frequently Asked Questions

What is this document? ▾
This scientific paper explores how magnetic fields influence the movement and stability of swirling discs of matter, such as those found around stars or black holes. It specifically examines how magnetic forces can trigger instabilities that allow material to flow inward by creating turbulence withi...
Where does this document come from? ▾
The document was authored by G. I. Ogilvie of the University of Cambridge (Institute of Astronomy and the Department of Applied Mathematics and Theoretical Physics). It was published in the 'Monthly Notices of the Royal Astronomical Society' and sourced from the arXiv astrophysics preprint server.
What is the research purpose of this document? ▾
The research aimed to develop a mathematical framework for understanding waves and instabilities in magnetized accretion discs using ideal magnetohydrodynamics (MHD). It specifically sought to solve the problem of how angular momentum is transported in these discs, which is necessary for material to actually reach the central object.
Where is this document cited in the investigation? ▾
This document is referenced in 1 places across the investigation: 1 Research Rounds. See the "Cited In" section below for the complete list of pages that reference this document.