High Angular Resolution Imaging of Sun
| Author | : Krishnakumar, V |
| Publisher | : |
| Total Pages | : 98 |
| Release | : 1998 |
| Genre | : Imaging systems in astronomy |
| ISBN | : |
Download High Angular Resolution Imaging of Sun Book in PDF, ePub and Kindle
High Angular Resolution Imaging Of Sun PDF Download
Are you looking for read ebook online? Search for your book and save it on your Kindle device, PC, phones or tablets. Download High Angular Resolution Imaging Of Sun PDF full book. Access full book title High Angular Resolution Imaging Of Sun.
Very High Angular Resolution Imaging
| Author | : J.G. Robertson |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 505 |
| Release | : 2013-12-01 |
| Genre | : Science |
| ISBN | : 9401108803 |
Download Very High Angular Resolution Imaging Book in PDF, ePub and Kindle
The 1990s are proving to be a very exciting p&iod for high angular resolution astronomy. At radio wavelengths a combination of new array instruments and pow erful imaging algorithms have generated images of unprecedented resolution and quality. In the optical and infrared, the great technical difficulties associated with constructing separated-aperture interferometers have been largely overcome, and many new instruments are now operating or are being developed. As these pro grams start to produce observational results they will be able to draw extensively on the experience gained by the radio-interferometry community. Thus it seemed that the time was ripe for a meeting which would bring together workers from all wavelength ranges to discuss the details of the science and art of "Very High Angular Resolution Imaging" . While the main emphasis of Symposium No. 158 was on high resolution tech niques from the radio, mm-wave, infrared and optical bands, it also provided an opportunity for presentation of astronomical results from these techniques. As well as giving our colleagues from the Northern Hemisphere a break from midwinter, the location of the Symposium in Australia recognised the continuing development of astronomical interferometry in this country, especially the recent completion of the Australia Telescope radio array, and the progress toward com missioning of the Sydney University Stellar Interferometer. A number of the par ticipants visited these instruments during the post-symposium tour.
Hard X-Ray Imaging of Solar Flares
| Author | : Michele Piana |
| Publisher | : Springer Nature |
| Total Pages | : 173 |
| Release | : 2022-01-01 |
| Genre | : Computers |
| ISBN | : 3030872777 |
Download Hard X-Ray Imaging of Solar Flares Book in PDF, ePub and Kindle
The idea for this text emerged over several years as the authors participated in research projects related to analysis of data from NASA's RHESSI Small Explorer mission. The data produced over the operational lifetime of this mission inspired many investigations related to a specific science question: the when, where, and how of electron acceleration during solar flares in the stressed magnetic environment of the active Sun. A vital key to unlocking this science problem is the ability to produce high-quality images of hard X-rays produced by bremsstrahlung radiation from electrons accelerated during a solar flare. The only practical way to do this within the technological and budgetary limitations of the RHESSI era was to opt for indirect modalities in which imaging information is encoded as a set of two-dimensional spatial Fourier components. Radio astronomers had employed Fourier imaging for many years. However, differently than for radio astronomy, X-ray images produced by RHESSI had to be constructed from a very limited number of sparsely distributed and very noisy Fourier components. Further, Fourier imaging is hardly intuitive, and extensive validation of the methods was necessary to ensure that they produced images with sufficient accuracy and fidelity for scientific applications. This book summarizes the results of this development of imaging techniques specifically designed for this form of data. It covers a set of published works that span over two decades, during which various imaging methods were introduced, validated, and applied to observations. Also considering that a new Fourier-based telescope, STIX, is now entering its nominal phase on-board the ESA Solar Orbiter, it became more and more apparent to the authors that it would be a good idea to put together a compendium of these imaging methods and their applications. Hence the book you are now reading.
The Sun at 8.5 MM Wavelength-results of Observation with High Angular Resolution
| Author | : Otto Hachenberg |
| Publisher | : |
| Total Pages | : 14 |
| Release | : 1978 |
| Genre | : |
| ISBN | : |
Download The Sun at 8.5 MM Wavelength-results of Observation with High Angular Resolution Book in PDF, ePub and Kindle
The Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) - Mission Description and Early Results
| Author | : R.P. Lin |
| Publisher | : Springer |
| Total Pages | : 450 |
| Release | : 2013-12-21 |
| Genre | : Science |
| ISBN | : 9401734526 |
Download The Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) - Mission Description and Early Results Book in PDF, ePub and Kindle
The Reuven Ramaty High Energy Solar Spectroscopic Imager (RHESSI) satellite was launched on 5 February 2002. Its objective is to study the energy release and particle acceleration in solar flares through observations of X-rays and gamma rays. Two novel technologies are combined to obtain both spectra and images over a broad energy range. For the spectroscopy, cooled hyperpure germanium detectors are used to cover the energy range from 3 keV to 17 MeV with unprecedented keV-class resolution. Since focusing optics are not possible for making images with such high energy photons, tungsten and molybdenum absorbing grids are used to modulate the X-rays and gamma-rays coming from the Sun as the spacecraft rotates. This allows the spatial Fourier components of the source to be determined so that images can be made in spectral ranges where astronomical images have never been produced before. These new instrumental techniques require equally innovative software to reconstruct X-ray and gamma-ray spectra and images from the observations. Ample solar activity, abundant observations, and an open data policy have attracted many researchers. Astronomers face in the RHESSI mission an exciting new scientific potential. It has unusually broad possibilities for improving our understanding of the enigmatic solar flare phenomenon that is becoming increasingly important as society depends more and more on space-based technologies. In this volume, the functioning of RHESSI is explained, the data analysis techniques including spectroscopy and image reconstruction are introduced, and the experiences of the first few months of operation are summarized. First scientific results are presented that provide the essential base for more extended studies using RHESSI data and complementary observations by instruments on other spacecraft and at ground-based solar observatories. Scientists and students will find here the latest discoveries in solar flare research, as well as inspiration for future work. The papers will serve as references for the many new discoveries to come from the continuing RHESSI observations.
The Solar Optical Telescope
| Author | : |
| Publisher | : |
| Total Pages | : 24 |
| Release | : 1984 |
| Genre | : Government publications |
| ISBN | : |
Download The Solar Optical Telescope Book in PDF, ePub and Kindle
Probing the Sun with High Resolution
| Author | : S. C. Tripathy |
| Publisher | : Alpha Science Int'l Ltd. |
| Total Pages | : 276 |
| Release | : 2003 |
| Genre | : Science |
| ISBN | : 9788173194825 |
Download Probing the Sun with High Resolution Book in PDF, ePub and Kindle
Contributed articles presented at the Meeting on "Probing the Sun with High Resolution" was held on Oct. 10-16, 2001 at Udaipur Solar Observatory, Udaipur.
Astronomy at High Angular Resolution
| Author | : Henri M. J. Boffin |
| Publisher | : Springer |
| Total Pages | : 284 |
| Release | : 2016-08-24 |
| Genre | : Science |
| ISBN | : 3319397397 |
Download Astronomy at High Angular Resolution Book in PDF, ePub and Kindle
This book offers an essential compendium of astronomical high-resolution techniques. Recent years have seen considerable developments in such techniques, which are critical to advances in many areas of astronomy. As reflected in the book, these techniques can be divided into direct methods, interferometry, and reconstruction methods, and can be applied to a huge variety of astrophysical systems, ranging from planets, single stars and binaries to active galactic nuclei, providing angular resolution in the micro- to tens of milliarcsecond scales. Written by experts in their fields, the chapters cover adaptive optics, aperture masking imaging, spectra disentangling, interferometry, lucky imaging, Roche tomography, imaging with interferometry, interferometry of AGN, AGN reverberation mapping, Doppler- and magnetic imaging of stellar surfaces, Doppler tomography, eclipse mapping, Stokes imaging, and stellar tomography. This book is intended to enable a next generation of astronomers to apply high-resolution techniques. It informs readers on how to achieve the best angular resolution in the visible and near-infrared regimes from diffraction-limited to micro-arcsecond scales.
High Resolution Optical Imaging Through the Atmosphere
| Author | : Robert W. Noyes |
| Publisher | : |
| Total Pages | : 57 |
| Release | : 1989 |
| Genre | : Astronomical instruments |
| ISBN | : |
Download High Resolution Optical Imaging Through the Atmosphere Book in PDF, ePub and Kindle
This program has concentrated on three major areas: the application of high angular resolution image reconstruction techniques to the reconstruction of solar surface features; speckle imaging of a wide range of astronomical sources; and the implementation of adaptive optics for faint object imaging. In this project, we have made substantial modifications to a technique for reconstruction of high resolution images from single short exposure solar frames, blind iterative deconvolution (IDC). We have been testing these improvements using numerical simulation data. Analysis of speckle data of the supernova SN1987A has detected a new bright source, 0.9 arcseconds south of the SN, as well as substantial structure in the region surrounding the SN. We also have new results on several Young Stellar Objects and supergiants. In the area of adaptive optics, an AOA wavefront sensor has been set up and tested using an image intensifier which increases its sensitivity by three orders of magnitude. Faint object image active tilt correction has also been tested with some important enhancements, including new highly linear and sensitive CCD quad cells developed by Cal Tech and Tektronix, and an off-the-shelf high speed 2-D tilting mirror with greatly improved specifications. The effects of only partially correcting atmospheric turbulence have been theoretically analyzed and numerically simulated.
The Sun as a Guide to Stellar Physics
| Author | : Oddbjørn Engvold |
| Publisher | : Elsevier |
| Total Pages | : 522 |
| Release | : 2018-11-15 |
| Genre | : Science |
| ISBN | : 0128143355 |
Download The Sun as a Guide to Stellar Physics Book in PDF, ePub and Kindle
The Sun as a Guide to Stellar Physics illustrates the significance of the Sun in understanding stars through an examination of the discoveries and insights gained from solar physics research. Ranging from theories to modeling and from numerical simulations to instrumentation and data processing, the book provides an overview of what we currently understand and how the Sun can be a model for gaining further knowledge about stellar physics. Providing both updates on recent developments in solar physics and applications to stellar physics, this book strengthens the solar–stellar connection and summarizes what we know about the Sun for the stellar, space, and geophysics communities. Applies observations, theoretical understanding, modeling capabilities and physical processes first revealed by the sun to the study of stellar physics Illustrates how studies of Proxima Solaris have led to progress in space science, stellar physics and related fields Uses characteristics of solar phenomena as a guide for understanding the physics of stars
