Stucki, K.; Solanki, S. K.; Schühle, U.; Rüedi, I.: On the relationship between shift and intensity of ultraviolet lines in coronal holes and the quiet Sun. Astronomy and Astrophysics 362, pp. L49 - L52 (2000)
Stucki, K.; Solanki, S. K.; Schühle, U.; Rüedi, I.; Wilhelm, K.; Stenflo, J. O.; Brkovic, A.; Huber, M. C. E.: Comparison of far-ultraviolet emission lines formed in coronal holes and the quiet Sun. Astronomy and Astrophysics 363, pp. 1145 - 1154 (2000)
Wilhelm, K.; Lemaire, P.; Dammasch, I. E.; Hollandt, J.; Schühle, U.; Curdt, W.; Kucera, T.; Hassler, D. M.; Huber, M. C. E.: Solar irradiances of ultraviolet emission lines measured during the minimum of sunspot activity in 1996 and 1997. Physics and Chemistry of the Earth C, 25, pp. 389 - 392 (2000)
Wilhelm, K.; Schühle, U.; Curdt, W.; Dammasch, I. E.; Hollandt, J.; Lemaire, P.; Huber, M. C. E.: Solar spectroradiometry with the telescope and spectrograph SUMER on the Solar and Heliospheric Observatory SOHO. Metrologia 37, pp. 393 - 398 (2000)
Feldman, U.; Doschek, G. A.; Schühle, U.; Wilhelm, K.: Properties of quiet-sun coronal plasmas at distances of 1.03 lt;= RS lt;= 1.50 along the solar equatorial plane. Astrophysical Journal 518, pp. 500 - 507 (1999)
Patsourakos, S.; Vial, J.-C.; Gabryl, J.-R.; Koutchmy, S.; Schühle, U.: Outflow Velocities at the Base of a Polar Coronal Hole during the 1998 Total Eclipse. Space Science Reviews 87, pp. 291 - 294 (1999)
Pauluhn, A.; Rüedi, I.; Solanki, S. K.; Lang, J.; Pike, C. D.; Schühle, U.; Thompson, W. T.; Huber, M. C. E.: Intercalibration of SUMER and CDS on SOHO. I. SUMER detector A and CDS NIS. Applied Optics 38, pp. 7035 - 7046 (1999)
Schühle, U.; Curdt, W.; Wilhelm, K.; Solanki, S. K.; Stucki, K.: Signatures of coronal hole spectra between 660 and 1460 Å measured with SUMER on SOHO. Space Science Reviews 87, pp. 299 - 302 (1999)
Stucki, K.; Solanki, S. K.; Rüedi, I.; Stenflo, J. O.; Brkovic, A.; Schühle, U.; Wilhelm, K.; Huber, M. C. E.: Coronal Holes Properties Observed with SUMER. Space Science Reviews 87, pp. 315 - 318 (1999)
Stucki, K.; Solanki, S. K.; Rüedi, I.; Stenflo, J. O.; Brkovic, A.; Schühle, U.; Wilhelm, K.; Huber, M. C. E.: Coronal holes versus normal quiet Sun observed with SUMER. Astrophysics and Space Science 264, pp. 53 - 61 (1999)
Wilhelm, K.; Lemaire, P.; Dammasch, I. E.; Hollandt, J.; Schühle, U.; Curdt, W.; Kucera, T.; Hassler, D. M.; Huber, M. C. E.: Solar irradiances of UV and EUV lines during the minimum of the sunspot activity in 1996. Advances in Space Research 24, pp. 229 - 232 (1999)
Wilhelm, K.; Woods, T. N.; Schühle, U.; Curdt, W.; Lemaire, P.; Rottman, G. J.: The solar ultraviolet spectrum from 1200 Å to 1560 Å: A radiometric comparison between SUMER/SOHO and SOLSTICE/UARS. Astronomy and Astrophysics 352, pp. 321 - 326 (1999)
Chae, J.; Wang, H.; Lee, C.-Y.; Goode, P. R.; Schühle, U.: Photospheric magnetic field changes associated with transition region explosive events. Astrophysical Journal 497, pp. L109 - L112 (1998)
Doschek, G. A.; Feldman, U.; Laming, J. M.; Warren, H. P.; Schühle, U.; Wilhelm, K.: The electron pressure in the solar lower transition region determined from O V and Si III density-sensitive line ratios. Astrophysical Journal 507, pp. 991 - 996 (1998)
Doschek, G. A.; Laming, J. M.; Feldman, U.; Wilhelm, K.; Lemaire, P.; Schühle, U.; Hassler, D. M.: The Si/Ne abundance ratio in polar coronal hole and quiet-Sun coronal regions. Astrophysical Journal 504, pp. 573 - 587 (1998)
Feldman, U.; Curdt, W.; Doschek, G. A.; Schühle, U.; Wilhelm, K.; Lemaire, P.: High-temperature lines in SUMER spectra recorded above a bright solar active region. Astrophysical Journal 503, pp. 467 - 474 (1998)
Feldman, U.; Schühle, U.; Widing, K. G.; Laming, J. M.: The coronal composition above the solar equator and the north pole as determined from spectra acquired by the SUMER instrument on SOHO. Astrophysical Journal 505, pp. 999 - 1006 (1998)
Hollandt, J.; Schühle, U.; Curdt, W.; Dammasch, I. E.; Lemaire, P.; Wilhelm, K.: Solar radiometry with the telescope and vacuum-ultraviolet spectrometer SUMER on the Solar and Heliospheric Observatory (SOHO). Metrologia 35, pp. 671 - 675 (1998)
Solar Orbiter is the first space probe to look at the Sun's poles – and finds the magnetic field there in a state of turmoil. The Sun's magnetic field is currently undergoing a flip.
First Light! The spectro-polarimeter of the world's largest solar telescope in Hawaii looks at the Sun for the first time. The instrument was developed in Germany.
Dr. Theodosios Chatzistergos receives award by the European Space Weather and Space Climate Association for his research findings on the historical activity of the Sun.
The Zdenĕk Švetska Senior Prize of the Solar Physics Division of the European Physical Society (EPS) recognizes Solanki’s pioneering contributions to solar research.