K. Wilhelm

Publications320
h-index39
Citations6,354
Highly Influential Citations428
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The SUMER spectral atlas of solar-disk features
A far-ultraviolet and extreme-ultraviolet (FUV, EUV) spectral atlas of the Sun between 670 Aa nd 1609 A in the rst order of diraction has been derived from observations obtained with the SUMER (Solar…
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Bi-directional plasma jets produced by magnetic reconnection on the Sun
Magnetic reconnection, the process by which magnetic lines of force break and rejoin into a lower-energy configuration, is considered to be the fundamental process by which magnetic energy is…
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SUMER - Solar Ultraviolet Measurements of Emitted Radiation
The instrument SUMER - Solar Ultraviolet Measurements of Emitted Radiation is designed to investigate structures and associated dynamical processes occurring in the solar atmosphere, from the…
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The corona above polar coronal holes as seen by SUMER on SOHO
In order to address two of the principal scientific objectives of the Solar and Heliospheric Observatory (SOHO), studies of the heating mechanisms of the solar corona and the acceleration processes…
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Solar Wind Origin in Coronal Funnels
TLDR
It is established that the solar wind starts flowing out of the corona at heights above the photosphere between 5 megameter and 20 megameters in magnetic funnels, and a model for understanding theSolar wind origin is suggested.
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FIRST RESULTS OF THE SUMER TELESCOPE AND SPECTROMETER ON SOHO – II. Imagery and Data Management
SUMER – Solar Ultraviolet Measurements of Emitted Radiation – is not only an extreme ultraviolet (EUV) spectrometer capable of obtaining detailed spectra in the range from 500 to 1610 Å, but, using…
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ION TEMPERATURES IN A SOLAR POLAR CORONAL HOLE OBSERVED BY SUMER ON SOHO
The temperatures of some highly charged ions in the southern solar polar coronal hole are determined from the widths of the extreme ultraviolet (EUV) lines measured by the SUMER (Solar Ultraviolet…
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Properties of quiet-sun coronal plasmas at distances of 1.03 lt;= RS lt;= 1.50 along the solar equatorial plane
We determine the physical properties, i.e., electron temperature, density, line-of-sight emission measure, and element-abundance variation with height, in the Sun's equatorial west limb streamer…
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First results of the SUMER telescope and spectrometer-solar ultraviolet measurements of emitted radiation-on SOHO, I. Spectra and Spectroradiometry
SUMER – the Solar Ultraviolet Measurements of the Emitted Radiation instrument on the Solar and Heliospheric Observatory (SOHO) – observed its first light on January 24, 1996, and subsequently…
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Doppler Shifts in the Quiet-Sun Transition Region and Corona Observed with Sumer on Soho
New observations of systematic red shifts of transition region and coronal lines obtained with SUMER (Solar Ultraviolet Measurements of Emitted Radiation) on SOHO (the Solar and Heliospheric…
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