X-ray spectra of solar flares obtained with a high-resolution bent crystal spectrometer

1981 ◽  
Vol 244 ◽  
pp. L141 ◽  
Author(s):  
J. L. Culhane ◽  
C. G. Rapley ◽  
R. D. Bentley ◽  
A. H. Gabriel ◽  
K. J. Phillips ◽  
...  
Keyword(s):  
High Resolution ◽  
Solar Flares ◽  
Crystal Spectrometer ◽  
X Ray ◽  
Bent Crystal

scholarly journals High-resolution spectroscopy on an X-ray absorption beamline

2009 ◽  
Vol 16 (2) ◽  
pp. 283-292 ◽  
Author(s):  
Jean-Louis Hazemann ◽  
Olivier Proux ◽  
Vivian Nassif ◽  
Hervé Palancher ◽  
Eric Lahera ◽  
...  
Keyword(s):  
High Resolution ◽  
Synchrotron Radiation ◽  
European Synchrotron Radiation Facility ◽  
High Resolution Spectroscopy ◽  
Environmental Sciences ◽  
Crystal Spectrometer ◽  
X Ray ◽  
Bent Crystal ◽  
X Ray Scattering ◽  
X Ray Absorption

A bent-crystal spectrometer based on the Rowland circle geometry has been installed and tested on the BM30b/FAME beamline at the European Synchrotron Radiation Facility to improve its performances. The energy resolution of the spectrometer allows different kinds of measurements to be performed, including X-ray absorption spectroscopy, resonant inelastic X-ray scattering and X-ray Raman scattering experiments. The simplicity of the experimental device makes it easily implemented on a classical X-ray absorption beamline. This improvement in the fluorescence detection is of particular importance when the probed element is embedded in a complex and/or heavy matrix, for example in environmental sciences.

scholarly journals High‐resolution bent‐crystal spectrometer for the ultrasoft x‐ray region

1989 ◽  
Vol 60 (5) ◽  
pp. 895-906 ◽  
Author(s):  
P. Beiersdorfer ◽  
S. von Goeler ◽  
M. Bitter ◽  
K. W. Hill ◽  
R. A. Hulse ◽  
...  
Keyword(s):  
High Resolution ◽  
Crystal Spectrometer ◽  
X Ray ◽  
Bent Crystal

High-temperature plasma in solar flares

1991 ◽  
Vol 336 (1643) ◽  
pp. 451-460 ◽  
Keyword(s):  
High Temperature ◽  
Solar Flares ◽  
Crystal Spectrometer ◽  
Temperature Plasma ◽  
X Ray ◽  
Physical Conditions ◽  
Bent Crystal ◽  
Spectroscopic Diagnostics ◽  
High Temperature Plasma ◽  
Ionization Balance

The thermal soft X-ray flare plasma is at temperatures ranging from a few million degrees up to about 40 x 10 6 K. In this paper I discuss some current problems in our understanding of the physical conditions in this plasma, particularly the ionization balance and the possible detection of non-thermal electrons. I discuss X-ray spectroscopic diagnostics that might help in resolving some of the issues, and I also discuss the possibility of addressing these problems with the bent crystal spectrometer experiment to be flown on Solar-A.

scholarly journals High-resolution bent-crystal spectrometer for the ultra-soft x-ray region

1988 ◽  
Author(s):  
P. Beiersdorfer ◽  
S. von Goeler ◽  
M. Bitter ◽  
K.W. Hill ◽  
R.A. Hulse ◽  
...  
Keyword(s):  
High Resolution ◽  
Crystal Spectrometer ◽  
X Ray ◽  
Bent Crystal

scholarly journals Derivation of the Ionization Balance for Iron XIV/XXV and XXIII/XXIV Using Solar X-Ray Data

1984 ◽  
Vol 86 ◽  
pp. 13-16
Author(s):  
E. Antonucci ◽  
M.A. Dodero ◽  
A.H. Gabriel ◽  
K. Tanaka
Keyword(s):  
Solar Flares ◽  
Solar Maximum ◽  
Plasma Electron ◽  
Large Set ◽  
Spectral Emission ◽  
Crystal Spectrometer ◽  
X Ray ◽  
Physical Conditions ◽  
Bent Crystal ◽  
Ionization Balance

The relative concentrations of different ionization stages of iron are measured using the spectral emission of plasmas formed during solar flares. This is an extension of a study on the ionization balance of heavy elements, initiated with the analysis of calcium solar spectra (Antonucci et al., 1984). The data consist of a large set of iron spectra in the wavelength range from 1.84 to 1.88 Å, detected during the recent maximum of activity with the X-ray Polychromator Bent Crystal Spectrometer (BCS) on the NASA Solar Maximum Mission satellite and on the Soft X-ray Crystal Spectrometer (SOX) on the Hinotori satellite.At the low densities typical of the solar corona, in the steady state the ionization balance of an element is a function of the plasma electron temperature. Hence, it can be measured for plasmas of known temperature and in slowly varying physical conditions, and in most cases, solar flare plasmas can be considered to be in such conditions.

scholarly journals Hydrodynamic Models of Solar and Stellar Flares

1989 ◽  
Vol 104 (1) ◽  
pp. 289-298
Author(s):  
Giovanni Peres
Keyword(s):  
High Resolution ◽  
Light Curve ◽  
Solar Flares ◽  
Impulsive Phase ◽  
Light Curves ◽  
Physical Parameters ◽  
The Sun ◽  
Hydrodynamic Models ◽  
X Ray ◽  
Stellar Flares

AbstractThis paper discusses the hydrodynamic modeling of flaring plasma confined in magnetic loops and its objectives within the broader scope of flare physics. In particular, the Palermo-Harvard model is discussed along with its applications to the detailed fitting of X-ray light curves of solar flares and to the simulation of high-resolution Caxix spectra in the impulsive phase. These two approaches provide complementary constraints on the relevant features of solar flares. The extension to the stellar case, with the fitting of the light curve of an X-ray flare which occurred on Proxima Centauri, demonstrates the feasibility of using this kind of model for stars too. Although the stellar observations do not provide the wealth of details available for the Sun, and, therefore, constrain the model more loosely, there are strong motivations to pursue this line of research: the wider range of physical parameters in stellar flares and the possibility of studying further the solar-stellar connection.

Elliptically Bent Crystal Spectrometer for Z-Pinch Plasma X-Ray

2009 ◽  
Vol 36 (1) ◽  
pp. 115-118
Author(s):  
王洪建 Wang Hongjian ◽  
肖沙里 Xiao Shali ◽  
施军 Shi Jun ◽  
黄显宾 Huang Xianbin ◽  
杨礼兵 Yang Libing ◽  
...  
Keyword(s):  
Crystal Spectrometer ◽  
X Ray ◽  
Pinch Plasma ◽  
Bent Crystal ◽  
Z Pinch

General purpose high‐resolution x‐ray crystal spectrometer (abstract)

1992 ◽  
Vol 63 (10) ◽  
pp. 5022-5022
Author(s):  
R. Barnsley ◽  
A. Abbey ◽  
J. Dunn ◽  
S. Lea ◽  
N. J. Peacock
Keyword(s):  
High Resolution ◽  
General Purpose ◽  
Crystal Spectrometer ◽  
X Ray
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