Now showing items 1-10 of 22
Comments on the Bilderberg Continuum Atmosphere
(Kluwer Academic Publishers; D. Reidel Publishing Company ; Springer Science+Business Media, 1968-01)
The Bilderberg Continuum Atmosphere fails to reproduce the observed limb-darkening throughout the range of wavelengths 4500 Å< λ < 25 000 Å. The temperature-pressure diagram for the deep layers of this model is a curve ...
Manganese and carbon lines as temperature indicators
(Kluwer Academic Publishers; D. Reidel Publishing Company ; Springer Science+Business Media, 1986-03)
Selected hyperfine structure broadened lines of various excitations and the carbon line at 5380 Å are tested as temperature diagnostics for photospheric heterogeneities. This is done by comparing the observed center-to-limb ...
On the Sun's limb brightening in the visible
(Kluwer Academic Publishers; D. Reidel Publishing Company ; Springer Science+Business Media, 1984-06)
It is shown that in practice the method by Julius (1906) is incapable to determine the limb intensity drop. The brief intensity reversal near the extreme limb as derived from cinematography of flash spectra can be explained ...
A comparison of the temperature and emission measure of X-ray active regions with coronal magnetic fields
(Kluwer Academic Publishers; D. Reidel Publishing Company ; Springer Science+Business Media, 1979-08)
The distribution of temperature and of emission measure in X-ray active regions relative to the coronal magnetic fields has been investigated. The position of maximum temperature and the position of maximum emission measure ...
Solar soft X-rays and solar activity
(Kluwer Academic Publishers; D. Reidel Publishing Company ; Springer Science+Business Media, 1972-06)
Peak fluxes of flare-associated 8–12 Å X-ray bursts occur at or near the time of the maximum energy content of the soft X-ray source volume. The amplitudes of flare-associated bursts may thus be used as a measure of the ...
A Re-Evaluation of the Abundance of Lutetium in the Sun
(Kluwer Academic Publishers; Springer Science+Business Media, 1998-03)
Lutetium is one of the few nonvolatile elements whose solar photospheric abundance departs significantly from that derived from CI chondrites. We have applied the Cowan code to compute new oscillator strengths for Luii, ...
Solar soft X-rays and solar activity
(Kluwer Academic Publishers; D. Reidel Publishing Company ; Springer Science+Business Media, 1969-08)
Soft solar X-rays (8 ⩽ gl ⩽ 12 Å) were observed from OSO-III. An analysis of the X-ray enhancements associated with 165 solar flares revealed that there is a tendency for a weak soft X-ray enhancement to precede the cm- λ ...
Note on the energy scale of the Michigan OSO III ion chamber
(Kluwer Academic Publishers; D. Reidel Publishing Company ; Springer Science+Business Media, 1972-01)
The energy scale of the Michigan OSO III soft X-ray ion chamber has been assessed by using realistic theoretical X-ray spectra. Multiplicative factors by which the data may be corrected are proposed. The factors are only ...
Core electron densities of coronal polar plumes
(Kluwer Academic Publishers; D. Reidel Publishing Company ; Springer Science+Business Media, 1972-12)
The electron density in the cores of coronal polar plumes that is determined from observations will depend upon the assumed electron density distribution through the plume in a direction normal to its axis. Core electron ...
Power spectra of velocity fluctuations in plages
(Kluwer Academic Publishers; D. Reidel Publishing Company ; Springer Science+Business Media, 1974-11)
Spatial power spectral densities of velocities in plages were compared with velocity power spectra of the quiet photosphere. The comparison suggests that photospheric oscillations are not gravity waves.