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Université de Fribourg

Algal growth and weathering crust state drive variability in western Greenland Ice Sheet ice albedo

Tedstone, Andrew J. ; Cook, Joseph M. ; Williamson, Christopher J. ; Hofer, Stefan ; McCutcheon, Jenine ; Irvine-Fynn, Tristram ; Gribbin, Thomas ; Tranter, Martyn

In: The Cryosphere, 2020, vol. 14, no. 2, p. 521–538

One of the primary controls upon the melting of the Greenland Ice Sheet (GrIS) is albedo, a measure of how much solar radiation that hits a surface is reflected without being absorbed. Lower-albedo snow and ice surfaces therefore warm more quickly. There is a major difference in the albedo of snow-covered versus bare-ice surfaces, but observations also show that there is substantial spatio-...

Consortium of Swiss Academic Libraries

Polarization Models for Rayleigh Scattering Planetary Atmospheres

Buenzli, Esther ; Schmid, Hans ; Joos, Franco

In: Earth, Moon, and Planets, 2009, vol. 105, no. 2-4, p. 153-157

Université de Fribourg

Search for axionlike dark matter through nuclear spin precession in electric and magnetic fields

Abel, C. ; Ayres, N.?J. ; Ban, G. ; Bison, G. ; Bodek, K. ; Bondar, V. ; Daum, M. ; Fairbairn, M. ; Flambaum, V.?V. ; Geltenbort, P. ; Green, K. ; Griffith, W.?C. ; Grinten, M. van der ; Grujiæ, Z.?D. ; Harris, P.?G. ; Hild, N. ; Iaydjiev, P. ; Ivanov, S.?N. ; Kasprzak, M. ; Kermaidic, Y. ; Kirch, K. ; Koch, H.-C. ; Komposch, S. ; Koss, P.?A. ; Kozela, A. ; Krempel, J. ; Lauss, B. ; Lefort, T. ; Lemi?re, Y. ; Marsh, D.?J.?E. ; Mohanmurthy, P. ; Mtchedlishvili, A. ; Musgrave, M. ; Piegsa, F.?M. ; Pignol, G. ; Rawlik, M. ; Rebreyend, D. ; Ries, D. ; Roccia, S. ; Rozpêdzik, D. ; Schmidt-Wellenburg, P. ; Severijns, N. ; Shiers, D. ; Stadnik, Y.?V. ; Weis, Antoine ; Wursten, E. ; Zejma, J. ; Zsigmond, G.

In: Physical Review X, 2017, vol. 7, no. 4, p. 041034

We report on a search for ultralow-mass axionlike dark matter by analyzing the ratio of the spin-precession frequencies of stored ultracold neutrons and 199Hg atoms for an axion-induced oscillating electric dipole moment of the neutron and an axion-wind spin-precession effect. No signal consistent with dark matter is observed for the axion mass range 10−24≤ma≤10−17 eV. Our null result...

Consortium of Swiss Academic Libraries

Disentangling stellar activity and planetary signals

Boisse, Isabelle ; Bouchy, François ; Hébrard, Guillaume ; Bonfils, Xavier ; Santos, Nuno ; Vauclair, Sylvie

In: Proceedings of the International Astronomical Union, 2010, vol. 6, no. S276, p. 399-400