Magnetic fields in galactic jets
Abstract
The jet region of M87 is discussed to illustrate the astrophysical observations of radio sources, with note made of magnetic field phenomena contributing to radio frequency emissions. The jet appearing in M87 has been modelled as a continuous supersonic flow of plasma embedded in a self-consistent, ordered magnetic field. The field has both parallel and helical components, and may work in concert with a fluid external pressure to maintain the shape of the jet. Kelvin-Helmholtz and resistive instabilities can disturb the flow, and analytical interpretations of both effects are presented. Turbulent Fermi-type acceleration and cyclotron resonance can lead to nonthermal X ray emission. Data on the magnetopause gathered by the ISEE-2 magnetospheric probe have shown that interaction between the solar wind and the magnetosphere has generated MHD modes and thereby accelerated particles that cause geomagnetic storms and aurorae.
- Publication:
-
Memorie della Societa Astronomica Italiana
- Pub Date:
- 1982
- Bibcode:
- 1982MmSAI..53.1049F
- Keywords:
-
- Astronomical Models;
- Magnetic Fields;
- Magnetohydrodynamic Stability;
- Radio Jets (Astronomy);
- Kelvin-Helmholtz Instability;
- Magnetic Storms;
- Magnetohydrodynamic Flow;
- Nonthermal Radiation;
- Particle Acceleration;
- Plasma Interactions;
- Radio Emission;
- Supersonic Flow;
- Astrophysics