Photoelectric drift scans II: time pulse evaluation,limb profiles,and the solar diameter     

Wittmann  A. 《Solar physics》1974,36(1):65-68

The method of computer controlled photoelectric drift scans has been improved by virtue of a new timing technique, allowing for an accuracy of 4 ms or equivalently 50 km on the Sun. With this technique, our previous result for the solar semidiameter has been confirmed: R = 960.277″. The extreme solar limb intensity profile at 5012 Å has been derived from drift scans. A comparison with the computed profile has been made, and parameters for the base of the chromosphere have been derived.

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On magneto-optical effects in sunspots     

A. Wittmann 《Solar physics》1971,20(2):365-368

Magneto-optical effects on the circular polarization within the line FeI 6302.5 are investigated. Quantitative results on the V-reversal near the line centre are given for homogeneous magnetic fields.  相似文献   

400 Jahre Mathematik und Astronomie an der Universität Würzburg: Alma Julia Herbipolensis 1582–1982     

Otto Volk 《Celestial Mechanics and Dynamical Astronomy》1982,28(1-2):243-250

Ohne Zusammenfassung

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400 years mathematics and astronomy at the Wurzburg University: Alma Julia herbipolensis 1582–1982

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s. O. Volk, Mathematik, Astronomie und Physik in der Vergangenheit der Universität Würzburg, Festschrift 1982.

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Paper presented at the 1981 Oberwolfach Conference on Mathematical Methods in Celestial Mechanics.  相似文献   

A hydrodynamic pulsation model under subharmonic resonance     

Toshiki Aikawa  Otto Bruegman 《Astrophysics and Space Science》1987,137(1):115-127

We found a hydrodynamic pulsation model of yellow supergiants under subharmonic resonance. It is confirmed that the feature of pulsation by the resonance is long-lived in the model by performing the hydrodynamical simulation for a long time.  相似文献   

Einiges zur Geometrie der Lagekugelbesetzung     

Otto Mellis 《Mineralogy and Petrology》1954,4(1-4):138-144

Ohne ZusammenfassungMit 3 Textabbildungen.  相似文献   

Gibt es auch im Diluvium orogene Phasen?     

Otto Wittmann 《International Journal of Earth Sciences》1941,32(3):337-367

Ohne Zusammenfassung  相似文献   

Structure of the Shear-Wave Low-Velocity Channel in the Western United States     

Tuncay Yasar  Otto W. Nuttli 《Geophysical Journal International》1974,37(3):353-364

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A source for hyperbolic cosmic dust particles     

Herbert A. Zook  Otto E. Berg 《Planetary and Space Science》1975,23(1):183-203

Earlier analyses of the Pioneer 8 and 9 experimental meteoroid data have shown that the detectors on these two spacecraft are intercepting meteoroids with hyperbolic orbital parameters. It is shown in this paper that these results are entirely consistent with and, indeed, to be expected from other observations of the interplanetary meteoroid complex. Collisional breakup of meteoroids and post-collision radiation pressure modification of their orbits is found to be a sufficient cause for the observed results. Details of the calculations as well as of the results are presented.  相似文献   

Flux–Profile Relationships Over a Fetch Limited Beech Forest     

Ebba Dellwik  Niels Otto Jensen 《Boundary-Layer Meteorology》2005,115(2):179-204

The influence of an internal boundary layer and a roughness sublayer on flux–profile relationships for momentum and sensible heat have been investigated for a closed beech forest canopy with limited fetch conditions. The influence was quantified by derivation of local scaling functions for sensible heat flux and momentum (_h and _m) and analysed as a function of atmospheric stability and fetch. For heat, the influences of the roughness sublayer and the internal boundary layer were in agreement with previous studies. For momentum, the strong vertical gradient of the flow just above the canopy top for some wind sectors led to an increase in _m, a feature that has not previously been observed. For a fetch of 500 m over the beech forest during neutral atmospheric conditions, there is no height range at the site where profiles can be expected to be logarithmic with respect to the local surface. The different influence of the roughness sublayer on _h and _m is reflected in the aerodynamic resistance for the site. The aerodynamic resistance for sensible heat is considerably smaller than the corresponding value for momentum.  相似文献   

Detection of blends in the vicinity of Zeeman lines     

A. Wittmann 《Solar physics》1972,23(2):294-299

High resolution spectrograms taken in polarized light have revealed the presence of significant blending within the profiles of some important Zeeman multiplets of a large umbra. Wavelength and equivalent width of each depictable blend have been derived from the corrected spectrograms and some preliminary identifications have been made.  相似文献