Search Results - "Wiehr, E."

Evidence for the Two-fluid Scenario in Solar Prominences by Wiehr, E., Stellmacher, G., Bianda, M.

“…This paper presents observational evidence of the different dynamical behavior of neutral and ionized species in solar prominences. The analysis of a…”
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Velocity Difference of Ions and Neutrals in Solar Prominences by Wiehr, E., Stellmacher, G., Balthasar, H., Bianda, M.

“…Abstract Marked velocity excesses of ions relative to neutrals are obtained from two time series of the neighboring emission lines He i 5015 Å and Fe ii 5018 Å…”
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Helium Emissions Observed in Ground-Based Spectra of Solar Prominences by Ramelli, R., Stellmacher, G., Wiehr, E., Bianda, M.

“…The only prominent line of singly ionized helium in the visible spectral range, He  ii  4686 Å, is observed together with the He  i  5015 Å singlet and the He …”
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Multiple-Scale Pattern Recognition Applied to Faint Intergranular G-band Structures by Bovelet, B, Wiehr, E

“…Small-scale solar magnetic flux concentrations are studied in two-dimensional G-band images at very high spatial resolution and compared with CaiiH…”
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Magnetic field strength and inclination in the penumbral fine-structure by Wiehr, E

“…The uncertainty about a possible correlation between magnetic field strength, inclination, and the continuum intensity of sunspot penumbral fine-structure has…”
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A New Algorithm for Pattern Recognition and its Application to Granulation and Limb Faculae by Bovelet, B, Wiehr, E

“…We have developed a new pattern-recognition algorithm based on multiple intensity clips which assures an optimal adaptation to the solar structure under study…”
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Helium Emissions Observed in Ground-Based Spectra of Solar Prominences by Ramelli, R., Stellmacher, G., Wiehr, E., Bianda, M.

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From the first Gregory-Coudé Telescope to Gregor by Wiehr, E.

“…The historic development of the Göttingen Gregory‐Coudé Telescope is sketched. The use of a Gregory system for a solar telescope was driven by the severe…”
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A retrospective of the GREGOR solar telescope in scientific literature by Denker, C., von der Lühe, O., Feller, A., Arlt, K., Balthasar, H., Bauer, S.-M., Bello González, N., Berkefeld, Th, Caligari, P., Collados, M., Fischer, A., Granzer, T., Hahn, T., Halbgewachs, C., Heidecke, F., Hofmann, A., Kentischer, T., Klvaňa, M., Kneer, F., Lagg, A., Nicklas, H., Popow, E., Puschmann, K.G., Rendtel, J., Schmidt, D., Schmidt, W., Sobotka, M., Solanki, S.K., Soltau, D., Staude, J., Strassmeier, K.G., Volkmer, R., Waldmann, T., Wiehr, E., Wittmann, A.D., Woche, M.

“…In this review, we look back upon the literature, which had the GREGOR solar telescope project as its subject including science cases, telescope subsystems,…”
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Spectroscopy of Solar Prominences Simultaneously From Space and Ground by Stellmacher, G, Wiehr, E, Dammasch, Ie

“…We present a comprehensive set of spectral data from two quiescent solar prominences observed in parallel from space and ground: with the VTT, simultaneous…”
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The Na i and Sr ii Resonance Lines in Solar Prominences by Stellmacher, G., Wiehr, E.

“…We estimate the electron density, n e , and its spatial variation in quiescent prominences from the observed emission ratio of the resonance lines Na  i …”
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The Nai and Srii Resonance Lines in Solar Prominences by Stellmacher, G, Wiehr, E

“…(ProQuest: ... denotes formulae and/or non-USASCII text omitted; see image) We estimate the electron density, ..., and its spatial variation in quiescent…”
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Two-dimensional photometric analysis of emission lines in quiescent prominences by Stellmacher, G, Wiehr, E

“…Emission lines from quiescent prominences were observed simultaneously through narrow-band interference filters, thus integrating the total line intensities…”
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Spatial offsets between lines and continuum in limb faculae by Stellmacher, G, Wiehr, E

“…High-spatial-resolution spectra of limb faculae show spatial displacements of line cores relative to the adjacent continuum at cos[theta]<0.35, confirming…”
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Continuum photometry of solar white-light faculae by Suetterlin, P, Wiehr, E, Stellmacher, G

“…We have determined absolute continuum intensities and brightness temperatures of individual facular grains at a spatial resolution limited by the Φ=50 cm…”
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Continuum limb polarization at high spatial resolution by Bianda, M., Wiehr, E.

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Automatic guiding of solar Gregory telescopes by Küveler, G., Wiehr, E., Bianda, M.

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Applying speckle masking to spectra by Sütterlin, P, Wiehr, E

“…We have applied the technique of speckle masking to spectra. The observation of elongated solar structures avoids the problem of missing information in…”
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Removing instrument and dome from the GCT building by Duensing, U., Harke, R., König, D., Wiehr, E.

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Spectroscopy of solar prominences from space and ground by Dammasch, I.E., Stellmacher, G., Wiehr, E.

“…Two quiescent solar prominences were observed in July 2000 from SUMER aboard SOHO and from the two German solar telescopes at Tenerife. Two‐dimensional images…”
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