The Wave-length of the Green Coronal Line and Other Data Resulting from an Attempt to Determine the Law of Rotation of the Solar Corona

1970 ◽  
pp. 225-231
Author(s):  
W.W. CAMPBELL
Keyword(s):  
Solar Corona ◽  
Wave Length ◽  
Coronal Line ◽  
The Law

Solar Corona Investigation by the Coronal Line Photometer at Lomnický Peak

1994 ◽  
Vol 144 ◽  
pp. 431-434
Author(s):  
M. Minarovjech ◽  
M. Rybanský
Keyword(s):  
Solar Corona ◽  
Time Resolution ◽  
Active Regions ◽  
High Time ◽  
High Time Resolution ◽  
List Type ◽  
Type Number ◽  
Coronal Line ◽  
Global Cycle

AbstractThis paper deals with a possibility to use the ground-based method of observation in order to solve basic problems connected with the solar corona research. Namely:1.heating of the solar corona2.course of the global cycle in the corona3.rotation of the solar corona and development of active regions.There is stressed a possibility of high-time resolution of the coronal line photometer at Lomnický Peak coronal station, and use of the latter to obtain crucial observations.

III.—The Law of Blackening of the Photographic Plate at Low Densities. (Second Paper.)

1928 ◽  
Vol 47 ◽  
pp. 34-51 ◽  
Author(s):  
E. A. Baker
Keyword(s):  
Photographic Plate ◽  
Wave Length ◽  
The Law

In a previous paper the relation between the illumination I on a panchromatic plate, the duration t of the exposure, the wave-length λ of the light, and the resulting density D of the deposit on the developed plate was investigated.

X.—The Law of Blackening of the Photographic Plate at Low Densities. (Third Paper.)

1929 ◽  
Vol 48 ◽  
pp. 106-133 ◽  
Author(s):  
E. A. Baker
Keyword(s):  
Photographic Plate ◽  
Wave Length ◽  
Single System ◽  
Full Development ◽  
The Law

SummaryOf a number of absorbing and emitting systems subjected to radiation, the proportions which suffer given sequences of absorptions and emissions are examined. The simple results which follow when the proportions so affected are small are applied to the photographic action on the assumption that in exposure the grain acts as a single system. They indicate that the grain requires two absorptions in succession to render it susceptible to “full” development, and three absorptions with one intermediate “emission” to render it susceptible to “partial” development, the terms “full” and “partial” being defined. These results are found to apply over the whole range of wave-length tested, from 4800 Å. to below 2000 Å.

The relative absorbing powers of the L-levels for radiation of varying wave-length

1924 ◽  
Vol 22 (3) ◽  
pp. 379-392 ◽  
Author(s):  
H. W. B. Skinner
Keyword(s):  
Absorption Coefficient ◽  
Wave Length ◽  
The Other ◽  
X Rays ◽  
A Value ◽  
The Law ◽  
Absorption Wave

1. Changes in the relative intensities of the lines in the fluorescentL-spectrum of Cerium excited by radiation of various wave-lengths have been observed.2. These results imply a change in the relative absorbing powers of the threeL-levels as the wave-length of the absorbed radiation diminishes from a value just below the absorption wave-length of theL-levels to a value considerably below. The absorbing power of theLI-level becomes increased relative to the absorbing powers of the otherL-levels as the wave-length diminishes. The results agree with those published by H. Robinson in a recent paper.3. These results imply a breakdown of the law that μ/λ3is a constant (where μ is the absorption coefficient of X-rays of wave-length λ) as applied to theindividual L-levels of an element.4. A comparison is made between the above results, and some results on the relative absorbing process of theL-levels obtained by Ellis and Skinner from β-ray spectra.

scholarly journals On the stress-optical effect in permanently overstrained celluloid

1925 ◽  
Vol 109 (750) ◽  
pp. 338-350 ◽  
Keyword(s):  
Wave Length ◽  
Optical Effect ◽  
Engineering Structures ◽  
Double Refraction ◽  
Permanent Strain ◽  
The Law

1. In a recent paper Dr. M. Wächtler (1), repeating and extending some previous experiments of H. Ambronn (2), has found that the residual double refraction in permanently overstrained celluloid, instead of increasing with the permanent strain, reaches a maximum and begins to decrease. For a permanent strain varying between 11 to 18 per cent, extension of the specimen (according to the wave-length of the light used), Wächtler states that the residual double refraction vanishes, and for higher values of the permanent strain he finds it to become negative and to increase negatively until the rupture limit is reached. This same phenomenon of reversal of double refraction had been previously observed by Ambronn (7). Wächtler bases upon this result certain severe criticisms upon the use of celluloid models for exploring the stresses in engineering structures, a method which has been employed of late years, with conspicuous success, by Prof. E. G. Coker (3). Wächtler, in the paper referred to, comments on the fact that neither Coker and Chakko (4), nor Filon and Jessop (5), in their investigations upon the law of artificial double refraction in celluloid, refer to the results of Ambronn, which were published in 1911.

scholarly journals The Law of the Solar Corona

1891 ◽  
Vol 3 ◽  
pp. 34
Author(s):  
Frank H. Bigelow
Keyword(s):  
Solar Corona ◽  
The Law

scholarly journals On the laws of radiation

1905 ◽  
Vol 76 (513) ◽  
pp. 545-552 ◽  
Keyword(s):  
Degrees Of Freedom ◽  
Present Author ◽  
Unit Volume ◽  
Wave Length ◽  
Radiant Energy ◽  
Ultimate State ◽  
Natural Radiation ◽  
The Law ◽  
Equipartition Of Energy ◽  
Internal Vibrations

1. An attempt to obtain the law of partition of the radiation proceeding from a radiating body calls at the outset for a consideration of the partition of energy between the matter of which the radiating body is composed,and the ether by which it is surrounded. This question has been discussed by Lord Rayleigh and by the present author. Assuming that the ultimate state of equilibrium between the energies of matter and ether has been reached, the theorem of equipartition of energy enables us to determine the amount not only of the total energy of the ether, but also of the energy of each wave-length. It is found that at temperature T, the energy per unit volume of radiation consisting of waves of wave-lengths between λ and λ + dλ is 8 π RT λ -4 dλ It is obvious that this law, according to which the energy tends to run entirely into waves of infinitesimal wave-length, cannot be the true law of partition of the radiant energy which actually occurs in nature. The law is obtained from the supposition that a state of statistical equilibrium has been arrived at between the energies of different wave-lengths and that of matter; the inference to be drawn from the failure of this law to represent natural radiation is that in natural radiation such a state of equilibrium does not obtain. An analogous situation presents itself in the theory of gases. According to the theorem of equipartition of energy, the energy of a gas will ultimately be almost entirely absorbed by the modes of internal vibration of its molecules, whereas it is known that in nature only a very small fraction of the energy is possessed by these internal vibrations. Thus we are led to suppose that there is not a state of equilibrium between the internal vibrations of the molecules and their energy of translation; we find that the transfer of energy from the translational to the vibrational degrees of freedom is so slow that the latter degrees never acquire their full share of energy, as given by the theorem.

The irregular structure of the outer regions of the solar corona

1955 ◽  
Vol 228 (1173) ◽  
pp. 238-251 ◽  
Keyword(s):  
Solar Corona ◽  
Electron Density ◽  
Large Scale ◽  
Wave Length ◽  
Radial Distance ◽  
Radio Interferometer ◽  
Scattering Mechanism ◽  
Irregular Structure ◽  
Made In

The radiation from the radio star in Taurus was recorded on a radio interferometer on occasions when the radiation passed through the outer regions of the solar corona. The recorded intensity was found to decrease rapidly as the radial distance decreased. A series of observations carried out during June 1953 with interferometers of different wave-length and spacing have indicated that the results cannot be explained in terms of absorption, or large-scale refraction effects in the corona. The observations may, however, be accounted for by a scattering mechanism arising from the presence of irregular variations of electron density in the corona. An estimate of the size and electron density of the coronal irregularities is made in the range of distance 5 to 15 R ⦿ . It is suggested that the irregular structure represents an extension of the visible coronal rays.

On Filter Observations of Coronal Structures in the Light of FeX 6374 Å Emission Line

1994 ◽  
Vol 144 ◽  
pp. 575-578
Author(s):  
F. I. Guetman ◽  
I. S. Kim ◽  
A. Bücher ◽  
C. A. Druzhinin ◽  
J.-C. Noëns ◽  
...  
Keyword(s):  
Comparative Analysis ◽  
Solar Corona ◽  
Emission Line ◽  
Interference Filter ◽  
Spectral Interval ◽  
Coronal Line ◽  
Interference Filters ◽  
Coronal Structures

AbstractThe red coronal line of Fe X (6374 Å) seems to be extremely suitable for filter observations due to reduced sky scattering in this spectral interval and absence of blending by Fraunhofer lines. Comparative analysis of location of Hαstructures in colour and black-white pictures of the solar corona of July 11, 1991 was carried out. A conclusion was made that care should be taken when interference filters are used for the red corona observations. Non-ideal monochromatization of present-day existing interference filters may be responsible for some ”false“ red and white coronal structures which belong to Hαprominence emission. Estimations of parameters of an interference filter for the reliable red coronal observations are presented.

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