Judge, P. G.; Hansteen, V.; Wikstøl, Ø.; Wilhelm, K.; Schühle, U.: Evidence in support of the ``nanoflare'' picture of coronal heating from SUMER data. Astrophysical Journal 502, pp. 981 - 996 (1998)
Lemaire, P.; Emerich, C.; Curdt, W.; Schühle, U.; Wilhelm, K.: Solar H I Lyman α full disk profile obtained with the SUMER/SOHO spectrometer. Astronomy and Astrophysics 334, pp. 1095 - 1098 (1998)
Schühle, U.; Brekke, P.; Curdt, W.; Hollandt, J.; Lemaire, P.; Wilhelm, K.: Radiometric calibration tracking of the vacuum-ultraviolet spectrometer SUMER during the first year of the SOHO mission. Applied Optics 37, pp. 2646 - 2652 (1998)
Tu, C.-Y.; Marsch, E.; Wilhelm, K.; Curdt, W.: Ion temperatures in a solar coronal hole observed by SUMER on SOHO. Astrophysical Journal 503, pp. 475 - 482 (1998)
Warren, H. P.; Mariska, J. T.; Wilhelm, K.: High-resolution observations of the solar hydrogen Lyman lines in the quiet Sun with the SUMER instrument on SOHO. Astrophysical Journal, Suppl. Ser. 119, pp. 105 - 120 (1998)
Wilhelm, K.; Lemaire, P.; Dammasch, I. E.; Hollandt, J.; Schühle, U.; Curdt, W.; Kucera, T.; Hassler, D. M.; Huber, M. C. E.: Solar irradiances and radiances of UV and EUV lines during the minimum of the sunspot activity in 1996. Astronomy and Astrophysics 334, pp. 685 - 702 (1998)
Wilhelm, K.; Marsch, E.; Dwivedi, B. N.; Hassler, D. M.; Lemaire, P.; Gabriel, A.; Huber, M. C. E.: The corona above polar coronal holes as seen by SUMER on SOHO. Astrophysical Journal 500, pp. 1023 - 1038 (1998)
Carlsson, M.; Judge, P. G.; Wilhelm, K.: SUMER Observations confirm the dynamic nature of the quiet solar outer atmosphere: The internetwork chromosphere. Astrophysical Journal 486, pp. L63 - L66 (1997)
Curdt, W.; Feldman, U.; Laming, J. M.; Wilhelm, K.; Schühle, U.; Lemaire, P.: The solar disk spectrum between 660 and 1175 Å (first order) obtained by SUMER on SOHO. Astron. Astrophys. Suppl. Ser. 126, pp. 281 - 296 (1997)
Doschek, G. A.; Mariska, J. T.; Warren, H. P.; Wilhelm, K.; Lemaire, P.; Kucera, T.; Schühle, U.: Determination of the formation temperature of Si IV in the solar transition region. Astrophysical Journal 477, pp. L119 - L122 (1997)
Doschek, G. A.; Warren, H. P.; Laming, J. M.; Mariska, J. T.; Wilhelm, K.; Lemaire, P.; Schühle, U.; Moran, T. G.: Electron densities in the solar polar coronal holes from density-sensitive line ratios of Si VIII and S X. Astrophysical Journal 482, pp. L109 - L112 (1997)
Feldman, U.; Behring, W. E.; Curdt, W.; Schühle, U.; Wilhelm, K.; Lemaire, P.; Moran, T. M.: A coronal spectrum in the 500-1610 Å wavelength range recorded at a height of 21,000 km above the west solar limb by the SUMER instrument on SOHO. Astrophysical Journal, Suppl. Ser. 113, pp. 195 - 219 (1997)
Hassler, D. M.; Wilhelm, K.; Lemaire, P.; Schühle, U.: Observations of polar plumes with the SUMER instrument on SOHO. Solar Physics 175, pp. 375 - 391 (1997)
The European Space Agency (ESA) has given the green light to build the flight models of the spacecraft and science payload for the PLATO mission to search for extrasolar planets.
In the "Solar and Stellar Interiors" department, Laurent Gizon, Jesper Schou, Aaron Birch, Robert Cameron and others offer PhD projects in solar physics and astrophysics. Helioseismology and asteroseismology are used as important tools to study the oscillating Sun and stars.
The longest-serving solar observatory in space has turned 25 and is still making significant contributions to solar research. Its old age has become an important merit.