| 1. |
- Hansson, Johan
(författare)
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The 11-Year Magnetic Solar Cycle: Chaos Control Due to Jupiter
- 2022
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Ingår i: Solar system research. - : Elsevier. - 0038-0946 .- 1608-3423. ; 56:3, s. 191-194
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Tidskriftsartikel (refereegranskat)abstract
- The observed magnetic field of the Sun is believed to originate from a “dynamo-effect” in its convective surface layer. However, there is no natural 11-year timescale in such models. We show that this timescale in the mean naturally and automatically arise through magnetic “chaos-control” of the inherently chaotic solar dynamo, mainly due to Jupiter, while also conforming to real and observed sunspot characteristics.
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| 2. |
- Lammer, H., et al.
(författare)
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Exoplanet status report: Observation, characterization and evolution of exoplanets and their host stars
- 2010
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Ingår i: Solar System Research. - 1608-3423 .- 0038-0946. ; 44:4, s. 290-310
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Tidskriftsartikel (refereegranskat)abstract
- After the discovery of more than 400 planets beyond our Solar System, the characterization of exoplanets as well as their host stars can be considered as one of the fastest growing fields in space science during the past decade. The characterization of exoplanets can only be carried out in a well coordinated interdisciplinary way which connects planetary science, solar/stellar physics and astrophysics. We present a status report on the characterization of exoplanets and their host stars by reviewing the relevant space- and ground-based projects. One finds that the previous strategy changed from space mission concepts which were designed to search, find and characterize Earth-like rocky exoplanets to: A statistical study of planetary objects in order to get information about their abundance, an identification of potential target and finally its analysis. Spectral analysis of exoplanets is mandatory, particularly to identify bio-signatures on Earth-like planets. Direct characterization of exoplanets should be done by spectroscopy, both in the visible and in the infrared spectral range. The way leading to the direct detection and characterization of exoplanets is then paved by several questions, either concerning the pre-required science or the associated observational strategy.
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| 3. |
- Rickman, Hans, et al.
(författare)
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CHOMIK : a multi-method approach for studying Phobos
- 2014
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Ingår i: Solar system research. - 0038-0946 .- 1608-3423. ; 48:4, s. 279-286
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Tidskriftsartikel (refereegranskat)abstract
- CHOMIK is the name of a penetrator constructed for sampling and retrieval of Phobos surface material. It formed an integral part of the Phobos Sample Return Mission. In this paper we present its construction and intended mode of operation, since the concept is still viable for future missions either to Phobos or to other small bodies of similar dimensions. We take Phobos as an example to describe the science case for such an instrument and how it might be utilized to resolve important open issues regarding the origin of the Martian moons. Concerning the latter, we place emphasis on measurement techniques and analysis tools for mapping trace element concentrations in returned sample.
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| 4. |
- Wieler, R., et al.
(författare)
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Comment on "Radiation History of Fossil Meteorites from Sweden" by V.A. Alexeev (2010), Solar System Research, 44, 311-319
- 2011
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Ingår i: Solar System Research. - 1608-3423. ; 45:5, s. 459-461
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- We dispute the claim by Alexeev (2010) that the numerous fossil meteorites found in mid-Ordovician sediments in southern Sweden can be explained by a single large meteorite shower some 470 million years ago, and-in particular-that the reported variable cosmic ray exposure ages derived from cosmogenic Ne-21 in chromite grains extracted from the fossil meteorites actually reflect variable contributions of nucleogenic Ne-21 instead.
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