scholarly journals Solar eclipse of 1900, May 28.—General discussion of spectroscopic results

1903 ◽  
Vol 71 (467-476) ◽  
pp. 228-229
Keyword(s):  
Solar Eclipse ◽  
Wave Length ◽  
Solar Spectrum ◽  
Great Majority ◽  
Dark Line ◽  
Bright Line ◽  
Flash Spectrum

In a general way the conclusions arrived at from the discussion of the spectra obtained in 1898 are amply confirmed and extended by the present results. It is now shown that every strong dark line of the solar spectrum exceeding Rowland’s intensity 7 is found in these spectra as a bright line; and the great majority of the bright lines of the flash spectrum, excluding hydrogen and helium lines, coincide with dark lines of intensity not less than 3. Most of the bright arcs of the flash spectrum are well-defined narrow lines admitting of considerable accuracy in the measures, and the present determinations of wave-length indicate that the coinci­dence of the bright lines with the dark lines is exact within ·05 t. m. for all the well-defined lines.

scholarly journals Solar eclipse of May 28, 1900. Preliminary report of the expedition to the south limit of totality to obtain photographs of the flash spectrum in high solar latitudes

1901 ◽  
Vol 67 (435-441) ◽  
pp. 370-385 ◽  
Keyword(s):  
Solar Eclipse ◽  
Royal Society ◽  
Preliminary Report ◽  
The South ◽  
Astronomical Society ◽  
Royal Astronomical Society ◽  
The Government ◽  
Flash Spectrum ◽  
Government Grant

This expedition was one of those organised by the Joint Permanent Eclipse Committee of the Royal Society and the Royal Astronomical Society, funds being provided from a grant made by the Government Grant Committee. The following were the principal objects which I had in view in arranging the expedition:— To obtain a long series of photographs of the chromosphere and flash spectrum, including regions of the sun’s surface in mid-latitudes, and near one of the poles.

A study of the helium D3 line in the flash spectrum of the 1983 eclipse

1997 ◽  
Vol 21 (3) ◽  
pp. 347-351 ◽  
Author(s):  
Hai-sheng Ji ◽  
Jian-qi You ◽  
Zhong-yu Fan
Keyword(s):  
Flash Spectrum

The Flash Spectrum, may 18, 1901

1902 ◽  
Vol 15 ◽  
pp. 97
Author(s):  
S. A. Mitchell
Keyword(s):  
Flash Spectrum

Photograph of "Flash" Spectrum

1898 ◽  
Vol 8 ◽  
pp. 198
Author(s):  
T. W. Backhouse
Keyword(s):  
Flash Spectrum

scholarly journals The explosion energy of the type IIP supernova SN 2013fs with a confined dense circumstellar shell

2020 ◽  
Vol 494 (1) ◽  
pp. L86-L90
Author(s):  
N N Chugai
Keyword(s):  
Alternative Energy ◽  
Energy Estimate ◽  
Explosion Energy ◽  
Dense Shell ◽  
Circumstellar Shell ◽  
Flash Spectrum

ABSTRACT The recent study of the SN 2013fs flash spectrum suggests an enormous explosion energy for SNe IIP, far beyond the possibilities of the neutrino mechanism. The issue of the explosion energy of SN 2013fs is revisited, making use of the effects of the early supernova interaction with the dense circumstellar shell. The velocity of the cold dense shell between reverse and forward shocks is inferred from the analysis of the broad He ii 4686 Å on day 2.4. This velocity, alongside other observables, provides us with an alternative energy estimate of ∼1.8 × 1051 erg for the preferred mass of ∼10 M⊙. The inferred value is within the range of neutrino-driven explosions.

The Experiment Study on Flash Spectrum Produced by Hypervelocity Impact

2015 ◽  
Vol 782 ◽  
pp. 197-203
Author(s):  
Kai Zhang ◽  
Qing Ming Zhang ◽  
Ren Rong Long
Keyword(s):  
Space Debris ◽  
Hypervelocity Impact ◽  
Spectral Lines ◽  
Line Spectrum ◽  
Weapon System ◽  
Flash Intensity ◽  
System A ◽  
Flash Spectrum ◽  
The Relationship ◽  
Important Significance

It is an inevitable phenomenon that flash is generated in the process of hypervelocity impact. The research on impact flash is of important significance for assessing the collision between space debris and spacecraft, identifying the material properties on the surface of planet, evaluating the damage of weapon system. A measurement system was built in order to acquire flash spectrum ranging in wavelength from 200 to 1100nm. The relationship between flash intensity and impact velocity was studied. The spectrum consists of line spectrum and continuous spectrum. Line spectrum mainly concentrates in the range of 200-500nm. The spectral lines of the elements were identified. The strong flash happens within 2.2ms after beginning to impact. In addition, the electron temperature of plasma produced in hypervelocity impact is calculated by spectral method, and compared with the temperature measured by Langmuir three probes.

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