Coronal Holes And High Speed Wind Streams
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Coronal Holes And High Speed Wind Streams
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Author : Jack B. Zirker
language : en
Publisher:
Release Date : 1977
Coronal Holes And High Speed Wind Streams written by Jack B. Zirker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Science categories.
Coronal Holes And High Speed Wind Streams
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Author : Jack B. Zirker
language : en
Publisher:
Release Date : 1977
Coronal Holes And High Speed Wind Streams written by Jack B. Zirker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Solar wind categories.
Solar Wind Acceleration In Coronal Holes High Speed Solar Wind Streams
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Author :
language : en
Publisher:
Release Date : 1978
Solar Wind Acceleration In Coronal Holes High Speed Solar Wind Streams written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1978 with categories.
Past attempts to explain the large solar wind velocities in high speed streams by theoretical models of the expansion have invoked either extended nonthermal heating of the corona, heat flux inhibition, or direct addition of momentum to the expanding coronal plasma. Several workers have shown that inhibiting the heat flux at low coronal densities is probably not adequate to explain quantitatively the observed plasma velocities in high speed streams. It stressed that, in order to account for both these large plasma velocities and the low densities found in coronal holes (from which most high speed streams are believed to emanate), extended heating by itself will not suffice. One needs a nonthermal mechanism to provide the bulk acceleration of the high wind plasma close to the sun, and the most likely candidate at present is direct addition of the momentum carried by outward-propagating waves to the expanding corona. Some form of momentum addition appears to be absolutely necessary if one hopes to build quantitatively self-consistent models of coronal holes and high speed solar wind streams.
Equatorial Coronal Holes And Their Relation To The High Speed Solar Wind Streams
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Author : Lidong Xia
language : en
Publisher:
Release Date : 2003
Equatorial Coronal Holes And Their Relation To The High Speed Solar Wind Streams written by Lidong Xia and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with categories.
Correlation Of High Latitude Coronal Holes With Solar Wind Streams High Above Or Below The Ecliptic
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Author : Kile B. Baker
language : en
Publisher:
Release Date : 1980
Correlation Of High Latitude Coronal Holes With Solar Wind Streams High Above Or Below The Ecliptic written by Kile B. Baker and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with categories.
This report has correlated the positions of high latitude coronal holes as determined from the Helium 10830 A spectroheliograms, with the velocities of solar wind streams high above or below the ecliptic, which could have originated from the same positions as the coronal holes. The solar wind speeds were determined from interplanetary scintillation (IPS) measurements made at the University of California at San Diego and at the Toyokawa Observatory in Japan. The correlation covered the two and a half year period, January 1, 1977 to June 30, 1979, during which there were no large equatorial coronal holes present, since we were approaching solar maximum. We have found that these high latitude coronal holes are often, but not always, correlated to high speed solar wind streams. The lack of a clearer correlation can be attributed to uncertainties in the solar wind velocities obtained from IPS measurements, to uncertainties in the exact boundaries of the coronal holes, and to the deflection or attenuation of relatively weak solar wind streams in interplanetary space.
Synoptic Charts Of Coronal Holes And 9 1 Cm Solar Data From May Through August 1973
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Author : Fred L. Wefer
language : en
Publisher:
Release Date : 1979
Synoptic Charts Of Coronal Holes And 9 1 Cm Solar Data From May Through August 1973 written by Fred L. Wefer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with categories.
The introduction reviews the geomagnetic disturbances due to high-speed solar wind streams produced by coronal holes and discusses the history of radio observations of coronal holes. In the main part of this work, using the central meridian column of the 9.1 cm Stanford solar radio maps, the authors constructed synoptic charts emphasizing temperatures near the quiet solar disk level. Synoptic charts were made for Carrington Rotations 1601-1605 (May - August 1973) which represents the overlapping period from the commencement of solar X-Ray data from ATM - Skylab (28 May 1973) to the termination of the Stanford solar radio mapping program (11 August 1973). Synoptic charts of coronal holes were superimposed on the radio charts to determine if the 9.1 cm synoptic charts could be used to identify coronal holes. Their findings lead them to conclude that the 9.1 cm synoptic charts can be of substantial value in identifying large coronal holes, especially during periods of low solar activity. Such synoptic charts, especially during the 1962-65 period of low solar activity, could strengthen the confidence on coronal hole boundaries in the 1960-1973 pre-Skylab period.
Coronal Holes And Solar Wind Acceleration
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Author : John Kohl
language : en
Publisher: Springer Science & Business Media
Release Date : 1999-08-31
Coronal Holes And Solar Wind Acceleration written by John Kohl and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999-08-31 with Science categories.
The SOHO-7 Workshop was held from 28 September through 1 October 1998 at the Asticou Inn in Northeast Harbor, Maine. The primary topic of this Workshop was the impact of SOHO observations on our understanding of the nature and evolution of coronal holes and the acceleration and composition of the solar wind. The presentations and discussions occasionally went beyond this topic to include the impact of the reported research on other solar structures and the heliosphere. SOHO (the Solar and Heliospheric Observatory), a project of international cooperation between ESA and NASA, was launched in December 1995 and began its science operations during the first few months of 1996. To many solar and space physicists, it was a great advantage that SOHO began itscomprehensive look at the Sun during the 1996 solar minimum. The qualitatively simple two-phase corona, with polar coronal holes expanding into the high-speed solar wind, and a steady equatorial streamer belt related somehow to the stochastic slow-speed solar wind, allowed various SOHO diagnostics to be initiated with a reasonably well understoodcircumsolar geometry. The analysis of subsequentSOHO measurements made during the rising phase of solar cycle 23 will continue to benefit from what has been learned from the first two years of data.
Corotating Interaction Regions
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Author : A. Balogh
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-06-29
Corotating Interaction Regions written by A. Balogh and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-06-29 with Science categories.
A Corotating Interaction Region (CIR) is the result of the interaction of fast solar wind with slower solar wind ahead. CIRs have a very large three-dimensional ex tent and are the dominant large-scale structure in the heliosphere on the declining and minimum phase of the solar activity cycle. Until recently, however, CIRs could only be observed close to the ecliptic plane, and their three-dimensional structure was therefore not obvious to observers and theoreticians alike. Ulysses was the first spacecraft allowing direct exploration of the third dimen sion of the heliosphere. Since 1992, when it has entered a polar orbit that takes it 0 up to 80 latitude, the spacecraft's performance has been flawless and the mission has provided excellent data from a superbly matched set of instruments. Perhaps the most exciting observation during Ulysses' first passage towards the south pole of the Sun was a strong and long lasting CIR whose energetic particle effects were observed up to unexpectedly high latitudes. These observations, documented in a number of publications, stimulated considerable new theoretical work.
Coronal Holes And Solar Wind Acceleration
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Author : John L. Kohl
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-11-09
Coronal Holes And Solar Wind Acceleration written by John L. Kohl and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-11-09 with Science categories.
The SOHO-7 Workshop was held from 28 September through 1 October 1998 at the Asticou Inn in Northeast Harbor, Maine. The primary topic of this Workshop was the impact of SOHO observations on our understanding of the nature and evolution of coronal holes and the acceleration and composition of the solar wind. The presentations and discussions occasionally went beyond this topic to include the impact of the reported research on other solar structures and the heliosphere. SOHO (the Solar and Heliospheric Observatory), a project of international cooperation between ESA and NASA, was launched in December 1995 and began its science operations during the first few months of 1996. To many solar and space physicists, it was a great advantage that SOHO began itscomprehensive look at the Sun during the 1996 solar minimum. The qualitatively simple two-phase corona, with polar coronal holes expanding into the high-speed solar wind, and a steady equatorial streamer belt related somehow to the stochastic slow-speed solar wind, allowed various SOHO diagnostics to be initiated with a reasonably well understoodcircumsolar geometry. The analysis of subsequentSOHO measurements made during the rising phase of solar cycle 23 will continue to benefit from what has been learned from the first two years of data.
Solar And Interplanetary Disturbances
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Author : S. K. Alurkar
language : en
Publisher: World Scientific
Release Date : 1997
Solar And Interplanetary Disturbances written by S. K. Alurkar and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Science categories.
Over the last three decades, a spate of solar wind observations have been made with sophisticated ground-based and space-borne instruments. Two highly successful space missions of the Skylab and the twin spacecraft Helios 1 and 2 have amassed an invaluable wealth of information on the large scale structure of the inner heliosphere, the solar and interplanetary magnetic field, coronal holes, interplanetary dust, solar windflows, etc.Solar and interplanetary propagating phenomena have been extensively studied during the last two decades. Very recently, a new simple model based on results from a density-mapping technique, pioneered at Cambridge, UK, has been proposed which overcomes the problems faced by the existing CME-driven shock theories.This monograph puts together those exciting developments in the field of solar and interplanetary dynamic phenomena with their effects, at times hazardous, on the terrestrial environment. It serves as an update and a ready reference for research students and scientists working in this field.