Max-Planck-Institut für Sonnensystemforschung

Dec 11, 2024 | academic.oup.com | Max-Planck-Institut für Sonnensystemforschung

The Rosetta spacecraft arrived at comet 67P/C-G (Churyumov–Gerasimenko) in August 2014, spending little more than 2 yr characterizing the shape and surface morphology of the nucleus, and deciphering the links between the gas and dust activity as they could be related to the underlying surface structure. Upon arrival the two-lobed nucleus structure, with dramatic morphological differences (Keller et al. 2015; Thomas et al.

Nov 7, 2024 | pubs.aip.org | Max-Planck-Institut für Sonnensystemforschung |Georg-August-Universität Göttingen |Space science |Abu Dhabi

In order to connect the rms flows in spherical geometry with the Cartesian-domain simulations, it is important to define the Fourier power in a way that allows direct comparisons. We use here the Fourier convention: where k is a two-dimensional horizontal wavevector. The position vector x takes the values (n,m)hx⁠, where hx=hy is the grid spacing in real space and (n,m) is a pair of integers, each in the range −N/2 to N/2−1⁠, where the even integer N is the number of grid points.

Apr 10, 2024 | academic.oup.com | Max-Planck-Institut für Sonnensystemforschung

The importance of ν (the frequency of maximum oscillation power) for asteroseismology has been demonstrated widely in the previous decade, especially for red giants. With the large amount of photometric data from CoRoT, Kepler and TESS, several automated algorithms to retrieve ν values have been introduced. Most of these algorithms correct the granulation background in the power spectrum by fitting a model and subtracting it before measuring ν .

Jan 8, 2024 | academic.oup.com | Max-Planck-Institut für Sonnensystemforschung |Technische Universität Braunschweig |Austrian Academy |Physikalisches Institut

Estimation of the properties of the sublimation products leaving the cometary nucleus is one of the significant questions in the study of the dusty-gas flow following the Rosetta mission. It is widely assumed that the temperature of the water molecules emitted is the temperature of ice directly exposed to the surface. However, it is the simplest non-verified idealisation if the refractory porous material lays on the surface and controls the energy driving the ice sublimation.

Aug 29, 2023 | aanda.org | Max-Planck-Institut für Sonnensystemforschung |Robert Cameron |Sami K. Solanki |Tanayveer S. Bhatia

Home All issues Volume 677 (September 2023) A&A, 677 (2023) C1 Full HTML Issue A&A Volume 677, September 2023 Article Number C1 Number of page(s) 1 Section Stellar atmospheres DOI https://doi.org/10.1051/0004-6361/202243607e Published online 29 August 2023 A&A 677, C1 (2023) Small-scale dynamo in cool stars 1, 1, 1,2, 1, 1, 1 and 1 1 Max-Planck-Institut für Sonnensystemforschung, Justus-von-Liebig Weg 3, 37077 Göttingen, Germany e-mail: [email protected] 2 School of Space Research, Kyung Hee...