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- Alfvén, Hannes
(författare)
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Annihilation model of quasi-stellar objects
- 1979
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Ingår i: Astrophysics and Space Science. - : Kluwer Academic Publishers. - 0004-640X .- 1572-946X. ; 64:2, s. 401-419
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Tidskriftsartikel (refereegranskat)abstract
- The possibility that annihilation is a major source of energy in cosmic physics is discussed. Since Klein suggested that the Universe might be matter-antimatter symmetric over two decades ago, there have been a significant number of papers developing the consequences of this view. These, however, have been largely ignored in the general literature. There have also been a number of papers claiming to prove that there cannot be antimatter anywhere in the observable Universe. In the first part of this paper an assessment of the differing views is given, and it is shown that none of the arguments against antimatter is convincing. The existence of antimatter is not in conflict with any observational fact. The reason for the negative attitude towards the existence of antimatter seems to be that this view is in conflict with a number of speculative but ‘generally accepted’ theories. However, recent magnetospheric and heliospheric research, includingin situ measurements of cosmic plasmas, is now drastically changing cosmic plasma physics in a way that leads to growing scepticism about quite a few of the speculative theories.An attempt is made to develop a simple phenomenological model of QSOs based on star-antistar collisions. This model can account for such basic observational properties as the acceleration to very large (non-cosmological) velocities, the existence of broad emission lines, and at the same time narrow absorption lines with different redshifts. The absence of blueshifts is also explained. The model predicts that relatively young QSOs should be at cosmological distances whereas the old ones may very well be much closer to us than indicated by their redshift.
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| 5. |
- Alfvén, Hannes
(författare)
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Cosmology : Myth or science
- 1976
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Ingår i: La Recherche (Imprimé). - : Société d'éditions Scientifiques. - 0029-5671 .- 1625-9955. ; 7:69, s. 610-616
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Tidskriftsartikel (refereegranskat)
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| 6. |
- Alfvén, Hannes
(författare)
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Double radio-sources and new approach to cosmical plasma physics
- 1978
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Ingår i: Astrophysics and Space Science. - : Kluwer Academic Publishers. - 0004-640X .- 1572-946X. ; 54:2, s. 279-292
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Tidskriftsartikel (refereegranskat)abstract
- The methodology of cosmic plasma physics is discussed. It is very hazardous to try to describe plasma phenomena by theories which have not been carefully tested experimentally. One present approach is to rely on laboratory measurements andin situ measurements in the magnetosphere and heliosphere, and to approach galactic phenomena by scaling up the wellknown phenomena to galactic dimensions. A summary is given of laboratory investigations of electric double layers, a phenomenon which is known to be very important in laboratory discharges. A summary is also given of thein situ measurements in the magnetosphere by which the importance of electric double layers in the Earth's surrounding is established. The scaling laws between laboratory and magnetospheric double layers are studied. The successful scaling between laboratory and magnetospheric phenomena encourages an extrapolation to heliospheric phenomena. A further extrapolation to galactic phenomena leads to a theory of double radio sources.In analogy with the Sun which, acting as a homopolar inductor, energizes the heliospheric current system, a rotating magnetized galaxy should produce a similar current system. From analogy with laboratory and magnetospheric current systems it is argued that the galactic current might produce double layers where a large energy dissipation takes place. This leads to a theory of the double radio sources which, within the necessary wide limits of uncertainty, is quantitatively reconcilable with observations.
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| 9. |
- Alfvén, Hannes
(författare)
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Electric-current model of the magnetosphere
- 1979
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Ingår i: ESA Journal. - : European Space Agency. - 0379-2285. ; 3:2, s. 91-99
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Tidskriftsartikel (refereegranskat)abstract
- A translation of the traditional field description of the magnetosphere into a particle (electric current) description is offered. Focus is on the energy transfer from the solar wind. The solar wind flow through the magnetic field acts as an electric generator. Its power is transferred to the magnetosphere through four main circuits. These are the magnetopause circuit, the solar wind/auroral circuit, the tail circuit, and the front circuit. A fifth circuit, the substorm circuit, is also very often energized. When the tail circuit flares, the current is partly redirected over the auroral zone, flowing in what is called the 'substorm circuit'.
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| 10. |
- Alfvén, Hannes
(författare)
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Electric currents in cosmic plasmas
- 1977
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Ingår i: Transactions - American Geophysical Union. - Stockholm : KTH Royal Institute of Technology. - 0002-8606. ; 58:6, s. 551-551
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Rapport (övrigt vetenskapligt/konstnärligt)
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