scholarly journals Fast high resolution echelle spectroscopy of a laboratory plasma

2006 ◽  
Vol 77 (6) ◽  
pp. 063504 ◽  
Author(s):  
C. D. Cothran ◽  
J. Fung ◽  
M. R. Brown ◽  
M. J. Schaffer
Keyword(s):  
High Resolution ◽  
Laboratory Plasma ◽  
Echelle Spectroscopy

Echelle Spectroscopy of Interstellar Absorption toward μ Columbae with the Goddard High Resolution Spectrograph

1999 ◽  
Vol 117 (1) ◽  
pp. 400-409 ◽  
Author(s):  
J. C. Brandt ◽  
S. R. Heap ◽  
E. A. Beaver ◽  
A. Boggess ◽  
K. G. Carpenter ◽  
...  
Keyword(s):  
High Resolution ◽  
Interstellar Absorption ◽  
Echelle Spectroscopy

High Resolution Coude Echelle Spectroscopy of IX Per

2009 ◽  
Author(s):  
N. Filiz Ak ◽  
Z. Eker ◽  
H. Ak ◽  
I. Küçük ◽  
Eric Stempels
Keyword(s):  
High Resolution ◽  
Echelle Spectroscopy

Echelle Spectroscopy of a Metal-Rich K Giant in Baade's Window Using the Keck High-Resolution Spectrograph

1996 ◽  
Vol 111 ◽  
pp. 2439 ◽  
Author(s):  
Sandra Castro ◽  
R. Michael Rich ◽  
Andrew McWilliam ◽  
Luis C. Ho ◽  
Hyron Spinrad ◽  
...  
Keyword(s):  
High Resolution ◽  
Echelle Spectroscopy

scholarly journals The Properties of Near-Infrared Diffuse Interstellar Bands

2013 ◽  
Vol 9 (S297) ◽  
pp. 100-102
Author(s):  
M. G. Rawlings ◽  
A. J. Adamson ◽  
B. J. McCall ◽  
T. H. Kerr
Keyword(s):  
High Resolution ◽  
Near Infrared ◽  
Diffuse Interstellar Bands ◽  
Echelle Spectroscopy

AbstractIn addition to the hundreds of known visual-wavelength Diffuse Interstellar Bands (DIBs), a number of DIBs in the near-infrared (NIR) are now also known to exist. We present here high-resolution UKIRT echelle spectroscopy of two of the NIR DIBs toward sightlines exhibiting a range of visual extinctions. Variations in the strengths and profile shapes of the bands are considered in the context of known properties of the narrow DIBs at visual wavelengths.

scholarly journals Intermittency in MHD turbulence and coronal nanoflares modelling

2005 ◽  
Vol 12 (2) ◽  
pp. 245-255 ◽  
Author(s):  
P. Veltri ◽  
G. Nigro ◽  
F. Malara ◽  
V. Carbone ◽  
A. Mangeney
Keyword(s):  
Magnetic Field ◽  
Solar Wind ◽  
High Resolution ◽  
Numerical Simulations ◽  
Longitudinal Magnetic Field ◽  
Ad Hoc ◽  
Dynamical Evolution ◽  
Mhd Equations ◽  
Mhd Turbulence ◽  
Laboratory Plasma

Abstract. High resolution numerical simulations, solar wind data analysis, and measurements at the edges of laboratory plasma devices have allowed for a huge progress in our understanding of MHD turbulence. The high resolution of solar wind measurements has allowed to characterize the intermittency observed at small scales. We are now able to set up a consistent and convincing view of the main properties of MHD turbulence, which in turn constitutes an extremely efficient tool in understanding the behaviour of turbulent plasmas, like those in solar corona, where in situ observations are not available. Using this knowledge a model to describe injection, due to foot-point motions, storage and dissipation of MHD turbulence in coronal loops, is built where we assume strong longitudinal magnetic field, low beta and high aspect ratio, which allows us to use the set of reduced MHD equations (RMHD). The model is based on a shell technique in the wave vector space orthogonal to the strong magnetic field, while the dependence on the longitudinal coordinate is preserved. Numerical simulations show that injected energy is efficiently stored in the loop where a significant level of magnetic and velocity fluctuations is obtained. Nonlinear interactions give rise to an energy cascade towards smaller scales where energy is dissipated in an intermittent fashion. Due to the strong longitudinal magnetic field, dissipative structures propagate along the loop, with the typical speed of the Alfvén waves. The statistical analysis on the intermittent dissipative events compares well with all observed properties of nanoflare emission statistics. Moreover the recent observations of non thermal velocity measurements during flare occurrence are well described by the numerical results of the simulation model. All these results naturally emerge from the model dynamical evolution without any need of an ad-hoc hypothesis.

scholarly journals High-resolution near-infrared observations of Herbig-Haro flows -- II. Echelle spectroscopy

2000 ◽  
Vol 314 (2) ◽  
pp. 241-255 ◽  
Author(s):  
C. J. Davis ◽  
A. Berndsen ◽  
M. D. Smith ◽  
A. Chrysostomou ◽  
J. Hobson
Keyword(s):  
High Resolution ◽  
Near Infrared ◽  
Infrared Observations ◽  
Echelle Spectroscopy

The STELLA project: two 1.2m robotic telescopes for simultaneous high-resolution Echelle spectroscopy and imaging photometry

2001 ◽  
Vol 322 (5-6) ◽  
pp. 287-294 ◽  
Author(s):  
K.G. Strassmeier ◽  
T. Granzer ◽  
M. Weber ◽  
M. Woche ◽  
G. Hildebrandt ◽  
...  
Keyword(s):  
High Resolution ◽  
Robotic Telescopes ◽  
Echelle Spectroscopy

scholarly journals New homogeneous iron abundances of double-mode Cepheids from high-resolution echelle spectroscopy

2007 ◽  
Vol 473 (2) ◽  
pp. 579-587 ◽  
Author(s):  
K. Sziládi ◽  
J. Vinkó ◽  
E. Poretti ◽  
L. Szabados ◽  
M. Kun
Keyword(s):  
High Resolution ◽  
Echelle Spectroscopy

Observations of the spatial structure of interstellar hydrogen

1967 ◽  
Vol 31 ◽  
pp. 45-46
Author(s):  
Carl Heiles
Keyword(s):  
High Resolution ◽  
Spatial Structure ◽  
Velocity Dispersion ◽  
Temperature Variations

High-resolution 21-cm line observations in a region aroundlII= 120°,b11= +15°, have revealed four types of structure in the interstellar hydrogen: a smooth background, large sheets of density 2 atoms cm-3, clouds occurring mostly in groups, and ‘Cloudlets’ of a few solar masses and a few parsecs in size; the velocity dispersion in the Cloudlets is only 1 km/sec. Strong temperature variations in the gas are in evidence.

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