Torben Leifsen

• Voort, Luc Rouppe van der; Pontieu, Bart Walter De; Carlsson, Mats; Rodriguez, Jaime de la Cruz; Bose, Souvik & Chintzoglou, Georgios [Show all 33 contributors for this article] (2020). High-resolution observations of the solar photosphere, chromosphere, and transition region: A database of coordinated IRIS and SST observations. Astronomy and Astrophysics (A & A). ISSN 0004-6361. 641. doi: 10.1051/0004-6361/202038732. Full text in Research Archive Show summary

  NASA’s Interface Region Imaging Spectrograph (IRIS) provides high-resolution observations of the solar atmosphere through ultraviolet spectroscopy and imaging. Since the launch of IRIS in June 2013, we have conducted systematic observation campaigns in coordination with the Swedish 1 m Solar Telescope (SST) on La Palma. The SST provides complementary high-resolution observations of the photosphere and chromosphere. The SST observations include spectropolarimetric imaging in photospheric Fe  I lines and spectrally resolved imaging in the chromospheric Ca  II 8542 Å, H α , and Ca  II K lines. We present a database of co-aligned IRIS and SST datasets that is open for analysis to the scientific community. The database covers a variety of targets including active regions, sunspots, plages, the quiet Sun, and coronal holes.

• Brynildsen, Nils; Maltby, Per; Leifsen, Torben; Kjeldseth-Moe, Olav & Wilhelm, K. (2000). Observations of sunspot transition region oscillations. Solar Physics. ISSN 0038-0938. 191, p. 129–159. Full text in Research Archive
• Brynildsen, Nils; Leifsen, Torben; Kjeldseth-Moe, Olav; Maltby, Per & Wilhelm, K. (1999). Sunspot transition region oscillations in NOAA 8156. The Astrophysical Journal (ApJ). ISSN 0004-637X. 511, p. L121–L124. Full text in Research Archive

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• Lilje, Per Barth; Helleland, Botolv; Johannessen, Finn Erhard; Leifsen, Torben & Ørstavik, Inger Berg (2020). Almanakk for Norge for året etter Kristi fødsel 2020. Gyldendal Norsk Forlag A/S. ISBN 9788205531222. 170 p. Full text in Research Archive
• Lilje, Per Barth; Helleland, Botolv; Johannessen, Finn Erhard; Leifsen, Torben & Ørstavik, Inger Berg (2019). Almanakk for Norge for året etter Kristi fødsel 2020. Gyldendal Norsk Forlag A/S. ISBN 9788205531222. 168 p. Full text in Research Archive
• Lilje, Per Barth; Helleland, Botolv; Johannessen, Finn Erhard; Leifsen, Torben & Ørstavik, Inger Berg (2018). Almanaikk for Norge for året etter Kristi fødsel 2019. Gyldendal Norsk Forlag A/S. ISBN 9788205518209. 164 p. Full text in Research Archive

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• Andersen, Bo N. & Leifsen, Torben (2004). Variation of low degree p-mode amplitudes. Full text in Research Archive
• Leifsen, Torben; Andersen, B.N. & Toutain, Thierry (2001). Temporal behaviour of radial p-modes. Full text in Research Archive
• Andersen, B.N.; Aarset, Magne; Leifsen, Torben; Appourchaux, T.; Fröhlich, C. & Jiménez, A. [Show all 8 contributors for this article] (1998). Statistical properties of the amplitude modulation of solar p-modes. Full text in Research Archive
• Andersen, B.N.; Leifsen, Torben; Appourchaux, T.; Fröhlich, C.; Hoeksema, J.T. & Toutain, Thierry [Show all 7 contributors for this article] (1998). The effect of amplitude modulation on asymmetries of solar p-modes. Full text in Research Archive
• Leifsen, Torben; Andersen, B.N.; Appourchaux, T.; Fröhlich, C.; Hoeksema, J.T. & Jiménez, A. [Show all 8 contributors for this article] (1998). Sources of amplitude modulation of solar p-modes. Full text in Research Archive
• Andersen, B.N.; Fröhlich, C.; Jiménez, A.; Leifsen, Torben & Wehrli, C. (1998). Time dependence of solar noise observed with VIRGO. Full text in Research Archive
• Stølen, Svein; Leifsen, Torben; Endestad, Tor; Christiansen, Torgeir; Miøen, Tore & Jensenius, Alexander Refsum [Show all 13 contributors for this article] (2015). Dataeksplosjonen - en stor utfordring, og en gedigen mulighet! Rapport fra arbeidsgruppen «Lagring og deling av forskningsdata» ved Universitetet i Oslo (UiO) 11.05.2015. Universitetet i Oslo. Full text in Research Archive

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