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Chapter and Conference Paper
Observational Approach and Perspective
Well you did not cover more than half of my planned talk! (laughter). Let me comment on interferometric techniques, in particular speckle imaging which you mentioned. Doing speckle imaging with the largest tel...
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Article
Low luminosity galactic X-ray sources
My aim in this presentation has been to begin the confrontation between models for soft X-ray emission from low-luminosity galactic X-ray sources and currently available data. I have focussed principally on di...
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Chapter and Conference Paper
The Einstein/CFA Stellar Survey: Overview of the Data and Interpretation of Results
We present results from an extensive survey of stellar X-ray emission, using the EINSTEIN Observatory. Over 140 stars have been detected to date, throughout the H-R diagram, thus showing that soft X-ray emissi...
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Chapter and Conference Paper
Low Luminosity Galactic X-Ray Sources
From the point of view of stellar structure and evolution, a star’s life is a fairly quiescent affair but for its birth and death. Yet during its long period of relative dormancy, the stellar surface is the si...
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Article
The flare of September 7, 1973: A typical example of a newly recognized class of solar transients
X-ray, extreme-ultraviolet and optical observations of a solar flare are discussed. It is shown that the flare exemplifies a class of transient events characterized by long duration and long decay time and by ...
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Chapter and Conference Paper
Stellar Coronae from Einstein: Observations and Theory
The new EINSTEIN Observatory data have dramatically changed our perspective on the constitution of low-luminosity galactic X-ray sources. Whereas X-ray emitting stars were thought to be the exception, we have ...
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Article
Configuration and gradual dynamics of prominence-related X-ray coronal cavities
We have analyzed X-ray images of the solar corona obtained by the S-054 telescope on Skylab, together with Hα filtergrams from the Catania Astrophysical Observatory and EUV and magnetic data, to study the morp...
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Article
Magnetic properties of x-ray bright points
Using high resolution KPNO magnetograms and sequences of simultaneous S-054 soft X-ray solar images we have compared the properties of X-ray bright points (XBP) and ephemeral active regions (ER). All XBP appea...
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Article
The spatial structure of a solar flare in soft X-rays and centimetric wavelengths
High-resolution images of the decay phase of a soft X-ray flare observed by the S-054 experiment on Skylab are compared with interferometric scans of the radio burst obtained simultaneously at 2.8 cm (Felli et al...
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Article
Evidence for magnetic energy storage in coronal active regions
Examination of X-ray images obtained by the S-054 X-ray spectrographic telescope on Skylab shows the presence of some atypical X-ray emitting coronal structures in active regions which are not consistent with ...
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Article
An atlas of coronal hole boundary positions May 28 to November 21, 1973
This atlas shows the boundary locations of the coronal holes observed in soft X-rays (2–32, 44–54 Å) by the AS & E X-ray spectrographic telescope on Skylab. The data are presented as tracings of the boundaries...
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Chapter
Coronal Bright Points
Soft X-ray images of the inner corona obtained with the AS & E spectrographic telescope aboard Skylab revealed the presence of coronal bright points in far greater numbers than had previously been suspected. B...
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Article
Atm observations, X-ray results
Preliminary results of the solar X-ray observations from Skylab are reviewed, indicating a highly structured nature for the corona, with closed magnetic loop structures over a wide range of size scales. A desc...
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Article
The interpretation of simultaneous soft X-ray spectroscopic and imaging observations of an active region
Simultaneous soft X-ray spectroscopic and broad band imaging observations of an active region have been analyzed together to determine the parameters which describe the coronal plasma. From the spectroscopic d...
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Article
Spatial structure and temporal development of a solar X-ray flare observed from Skylab on June 15, 1973
A solar flare on June 15, 1973 has been observed with high spatial and temporal resolution by the S-054 grazing-incidence X-ray telescope on Skylab. Both morphological and quantitative analyses are presented. ...
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Article
A comparison of coronal X-ray structures of active regions with magnetic fields computed from photospheric observations
The appearances of several X-ray active regions observed on March 7, 1970 and June 15, 1973 are compared with the corresponding coronal magnetic field topology. Coronal fields have been computed from measureme...
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Article
The coronal structure of active regions
A four-parameter model which assumes a Gaussian dependence of both temperature and pressure on distance from center is used to fit the compact part of coronal active regions as observed in X-ray photographs fr...
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Article
Observation of a non-uniform component in the distribution of coronal bright points
The longitude distribution of X-ray bright points shows very strong variations when plotted in a heliocentric (Carrington) coordinate system. In addition, the latitude distribution can be interpreted as having...
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Article
The structure and evolution of coronal holes
When observed at soft X-ray wavelengths coronal holes are seen as open features, devoid of X-ray emission and bounded by apparently divergent coronal loop structures. Inspection of the topology of the photosph...
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Chapter
Time Variations of Solar X-Ray Bright Points
An example of the overall view of the X-ray corona (nominal filter pass-band 2–32 Å and 44–54 Å) showing a coronal hole, filament activity, bright points and the large scale-scale loop structures, is shown in ...
