The correspondence between x-ray bright points and evolving magnetic features in the quiet sun

Solar Physics ◽  
1993 ◽  
Vol 144 (1) ◽  
pp. 15-35 ◽  
Author(s):  
D. F. Webb ◽  
S. F. Martin ◽  
D. Moses ◽  
J. W. Harvey
Keyword(s):  
X Ray ◽  
Quiet Sun ◽  
Magnetic Features

scholarly journals NuSTAR Detection of X-Ray Heating Events in the Quiet Sun

2018 ◽  
Vol 856 (2) ◽  
pp. L32 ◽  
Author(s):  
Matej Kuhar ◽  
Säm Krucker ◽  
Lindsay Glesener ◽  
Iain G. Hannah ◽  
Brian W. Grefenstette ◽  
...  
Keyword(s):  
X Ray ◽  
Quiet Sun

X-ray and Magnetic Features of Hα Surges

1996 ◽  
pp. 437-438 ◽  
Author(s):  
A. Okubo ◽  
R. Matsumoto ◽  
S. Miyaji ◽  
M. Akioka ◽  
H. Zhang ◽  
...  
Keyword(s):  
X Ray ◽  
Magnetic Features

scholarly journals Observations of Magnetic Features with the German Solar Telescopes at the Observatorio del Teide/Tenerife

1990 ◽  
Vol 142 ◽  
pp. 113-117
Author(s):  
F. Kneer ◽  
D. Soltau ◽  
E. Wiehr
Keyword(s):  
Magnetic Field ◽  
Fine Structure ◽  
Spatial Variation ◽  
Velocity Fluctuation ◽  
Small Scale ◽  
Field Variation ◽  
Magnetic Field Variation ◽  
Quiet Sun ◽  
Magnetic Features ◽  
Solar Telescopes

The German solar facilities at the Obsrvatorio del Teide are described first. Then, a few examples of recent results from magnetic features are given: spatial variation and velocity fluctuation of small-scale magnetic fluxtubes in the quiet Sun, Evershed flow and magnetic field in connection with penumbral fine structure, and magnetic field variation in sunspot umbrae.

Investigating the characteristics of X-ray flares of a quiet sun using the PINGVIN-M polarimeter aboard the KORONAS-FOTON Satellite

2011 ◽  
Vol 75 (6) ◽  
pp. 744-746 ◽  
Author(s):  
A. S. Glyanenko ◽  
Yu. D. Kotov ◽  
A. I. Arkhangelsky ◽  
A. S. Buslov ◽  
V. N. Yurov ◽  
...  
Keyword(s):  
X Ray ◽  
Quiet Sun

Soft X‐Ray Luminosity and Photospheric Magnetic Field in Quiet Sun

2001 ◽  
Vol 554 (1) ◽  
pp. 416-423 ◽  
Author(s):  
Alexei A. Pevtsov ◽  
Loren W. Acton
Keyword(s):  
Magnetic Field ◽  
Photospheric Magnetic Field ◽  
X Ray ◽  
Quiet Sun

X-Ray Surveys of the Quiet Sun, the Magellanic Clouds and the Cygnus Region

1967 ◽  
Vol 1 (1) ◽  
pp. 28-29
Author(s):  
P. J. Edwards ◽  
K. G. McCracken
Keyword(s):  
Magellanic Clouds ◽  
X Rays ◽  
X Ray ◽  
Quiet Sun

Balloon borne alt-azimuth mounted X-ray telescopes flown from Hyderabad, India (17°N), Palestine, Texas (32°N), and Mildura, Australia (34°S), have detected hard X-rays (hv>20KeV) from discrete sources in the Cygnus region.

scholarly journals 3. Astrophysical measurements from rockets

1960 ◽  
Vol 10 ◽  
pp. 706-708 ◽  
Author(s):  
Herbert Friedman
Keyword(s):  
Hot Spots ◽  
Wave Length ◽  
Short Wave ◽  
Green Line ◽  
X Ray ◽  
Quiet Sun ◽  
Short Wave Length ◽  
Coronal Activity

The X-ray spectrum of a quiet Sun can be approximated by a 500,000° K Planckian distribution. In the absence of coronal excitation, as evidenced by the intensity of the Fe xiv green line, the X-ray spectrum has a short wave-length limit near 20 A. Coronal activity is accompanied by weak emissions down to wave-lengths as short as 6 A, which appear to be associated with coronal hot spots at temperatures of 2 x 106° K or higher.

scholarly journals Structural and Magnetic Properties of FePd Thin Film Synthesized by Electrodeposition Method

Materials ◽  
2020 ◽  
Vol 13 (6) ◽  
pp. 1454
Author(s):  
Gabriele Barrera ◽  
Federico Scaglione ◽  
Matteo Cialone ◽  
Federica Celegato ◽  
Marco Coïsson ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Magnetic Properties ◽  
Deposition Time ◽  
Magnetic Measurements ◽  
X Ray Diffraction ◽  
X Ray ◽  
Fundamental Properties ◽  
Magnetic Features ◽  
Application Fields

Bimetallic nanomaterials in the form of thin film constituted by magnetic and noble elements show promising properties in different application fields such as catalysts and magnetic driven applications. In order to tailor the chemical and physical properties of these alloys to meet the applications requirements, it is of great importance scientific interest to study the interplay between properties and morphology, surface properties, microstructure, spatial confinement and magnetic features. In this manuscript, FePd thin films are prepared by electrodeposition which is a versatile and widely used technique. Compositional, morphological, surface and magnetic properties are described as a function of deposition time (i.e., film thickness). Chemical etching in hydrochloric acid was used to enhance the surface roughness and help decoupling crystalline grains with direct consequences on to the magnetic properties. X-ray diffraction, SEM/AFM images, contact angle and magnetic measurements have been carried out with the aim of providing a comprehensive characterisation of the fundamental properties of these bimetallic thin films.

EFFECT OF AIR EXPOSURE ON STRUCTURAL AND MAGNETIC FEATURES OF FeCo NANOPARTICLES

2007 ◽  
Vol 21 (18) ◽  
pp. 1161-1168 ◽  
Author(s):  
S. MOURDIKOUDIS ◽  
K. SIMEONIDIS ◽  
M. ANGELAKERIS ◽  
I. TSIAOUSSIS ◽  
O. KALOGIROU ◽  
...  
Keyword(s):  
Organometallic Complexes ◽  
Soft Magnetic ◽  
Air Exposure ◽  
X Ray ◽  
First Case ◽  
High Metal ◽  
Magnetic Nanomaterial ◽  
Magnetic Features ◽  
Structural And Magnetic Properties ◽  
Feco Nanoparticles

Monodisperse FeCo nanoparticles were synthesized via thermal decomposition of appropriate organometallic complexes in heated toluene containing surfactants, aiming to a soft magnetic nanomaterial with a high metal percent. The particles were characterized by X-ray powder diffraction, electron microscopy, and static magnetometry techniques. The effect of air exposure on the structural and magnetic properties was examined. Portions of the dried nanoparticles were mixed with additional surfactants or polyvinylpyrrolidone, followed by redispersion into tetrahydrofuran, so as to study arrangement features in the first case, while the use of polyvinylpyrrolidone intended to the expansion of the interparticle distances in order to get more "isolated" nanoparticles.

scholarly journals X-ray Lines From Mg VIII and Si X Ions and Their Diagnostic Use

1990 ◽  
Vol 115 ◽  
pp. 40-43
Author(s):  
Bhola N. Dwivedi
Keyword(s):  
Electron Density ◽  
Line Intensity ◽  
Coronal Holes ◽  
Emission Lines ◽  
X Ray ◽  
Quiet Sun ◽  
Diagnostic Use ◽  
Line Intensity Ratio ◽  
Theoretical Line ◽  
Intensity Ratios

AbstractThe solar X-ray emission lines from Mg VIII and Si X ions have been studied. The variation of theoretical line intensity ratio I(λ 75.03)/I(λ 74.86) from Mg VIII and I(λ 50.69)/I(λ 50.52) from Si X as a function of electron density is found to be good density monitors of the emitting regions of solar plasma. The computed values of line intensity from these ions based on Kopp and Orrall model have been used to derive electron density of the quiet Sun and coronal holes. The electron densities of 109 cm-3 and 4.6 × 108 cm-3 are estimated at the electron temperatures of 8 x 105 K and 1.6 x 106 K for the quiet Sun whereas the respective values of 5.4 x 108 cm-3 and 1.7 x 108 cm-3 are obtained for the coronal holes. The line intensity ratios studied here are independent of temperature variation and are therefore excellent candidates for electron density diagnostics. However, observational data with improved spectral resolution is needed for using X-ray line pairs studied for their diagnostic use.

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