The Structure of the Quiet Photosphere and the Low Chromosphere
Title | The Structure of the Quiet Photosphere and the Low Chromosphere PDF eBook |
Author | C. de Jager |
Publisher | Springer Science & Business Media |
Pages | 244 |
Release | 2012-12-06 |
Genre | Science |
ISBN | 9401034702 |
From 17 to 21 April 1967 a Study Week was held in the hotel 'De Bilderberg' near Arnhem, Holland, with the purpose to establish a new, and if possible, generally acceptable working model for the quiet parts of the solar photosphere and low chromosphere. The organizers of the conference hoped that even if this latter goal appeared too far to be reached, such a meeting would still be useful, if only for enumerating the crucial problems in solar photospheric research, and for defining future subjects of research. About twenty solar physicists from outside the Netherlands participated in the Study Week, while some others, though prevented from actively attending, sub mitted their comments before the meeting. The two above-mentioned goals were reached: a working model could be estab lished; yet it became clear that not everyone would agree about this model, and it became obvious too that future research is strongly needed, in particular in the field of line formation (coherence, or non-coherence; local thermal equilibrium), while also the motion field of the photosphere and chromosphere is insufficiently known, and its influence on the formation of spectral lines hardly understood.
The Structure of the Quiet Photosphere and the Low Chromosphere
Title | The Structure of the Quiet Photosphere and the Low Chromosphere PDF eBook |
Author | C. De Jager |
Publisher | |
Pages | 248 |
Release | 1968-07-31 |
Genre | |
ISBN | 9789401034715 |
Solar Photosphere: Structure, Convection, and Magnetic Fields
Title | Solar Photosphere: Structure, Convection, and Magnetic Fields PDF eBook |
Author | Jan Olof Stenflo |
Publisher | Springer Science & Business Media |
Pages | 546 |
Release | 2012-12-06 |
Genre | Science |
ISBN | 9400910614 |
Solar and stellar photospheres constitute the layers most accessible to observations, forming the interface between the interior and the outside of the stars. The solar atmosphere is a rich physics laboratory, in which the whole spectrum of radiative, dynamical, and magnetic processes that tranfer energy into space can be observed. As the fundamental processes take place on very small spatial scales, we need high· resolution observations to explore them. On the other hand the small-scale processes act together to form global properties of the sun, which have their origins in the solar interior. The rapid advances in observational techniques and theoreticallllodelling over the past decade made it very timely to bring together scientists from east and west to the first lAU Symposium on this topic. The physics of the photosphere involves complicated interactions between magnetic fields, convection, waves, and radiation. During the past decade our understanding of these gener ally small-scale structures and processes has been dramatically advanced. New instrumen tations, on ground and in space, have given us new means to study the granular convection. Diagnostic methods in Stokes polarimetry have allowed us to go beyond the limitations of spatial resolution to explore the structure and dynamics of the subarcsec magnetic struc tures. Extensive numerical simulations of the interaction between convection and magnetic fields using powerful supercomputers are providing deepened physical insight. Granulation, magnetic fields, and dynamo processes are being explored in the photospheres of other stars, guided by our improved understanding of the solar photosphere.
The Physics of Chromospheric Plasmas
Title | The Physics of Chromospheric Plasmas PDF eBook |
Author | Petr Heinzel |
Publisher | |
Pages | 696 |
Release | 2007 |
Genre | Science |
ISBN |
The Structure of the Quiet Photosphere and the Low Chromosphere
Title | The Structure of the Quiet Photosphere and the Low Chromosphere PDF eBook |
Author | |
Publisher | |
Pages | |
Release | 1968 |
Genre | |
ISBN |
The Solar Chromosphere and Corona: Quiet Sun
Title | The Solar Chromosphere and Corona: Quiet Sun PDF eBook |
Author | R.G. Athay |
Publisher | Springer Science & Business Media |
Pages | 517 |
Release | 2012-12-06 |
Genre | Science |
ISBN | 9401017158 |
The widespread tendency in solar physics to divide the solar atmosphere into separate layers and to distinguish phenomena of solar activity from phenomena of the quiet Sun emphasizes the wide ranging diversity of physical conditions and events occurring in the solar atmosphere. This diversity spans the range from a neutral, essentially quiescent atmosphere to a highly ionized, violently convective atmosphere; from a domain in which magnetic field effects are unimportant to a domain in which the magnetic pressure exceeds the gas pressure, and from a domain in which the particle motions are Maxwellian to a domain in which an appreciable fraction of the particles is accelerated to relativistic energies. It is now widely recognized that the chromosphere and corona have a common origin in the mechanical energy flux generated in the hydrogen convection zone lying beneath the photosphere. Furthermore, magnetic field phenomena appear to be as vital to the structure of th~ quiet Sun as to the active Sun. For these reasons it appears desirable to present a unified treatment of the entire solar atmosphere, both active and quiet, in a single volume. On the other hand, such a treatise must be very long if it is to avoid being superficial, and it is very difficult for a single author to write authoritatively on such a wide range of topics.
The Structure of the Sun
Title | The Structure of the Sun PDF eBook |
Author | T. Roca Cortes |
Publisher | Cambridge University Press |
Pages | 422 |
Release | 1996-08-28 |
Genre | Science |
ISBN | 9780521563079 |
The complex internal structure of the Sun can now be studied in detail through helioseismology and neutrino astronomy. The VI Canary Islands Winter School of Astrophysics was dedicated to examining these powerful new techniques. Based on this meeting, eight specially-written chapters by world-experts are presented in this timely volume. We are shown how the internal composition and dynamical structure of the Sun can be deduced through helioseismology; and how the central temperature can be determined from the flux of solar neutrinos. This volume provides an excellent introduction for graduate students and an up-to-date overview for researchers working on the Sun, neutrino astronomy and helio- and asteroseismology.