搜索结果: 1-7 共查到“天文学 cycles”相关记录7条 . 查询时间(0.059 秒)
Climate cycles may explain how running water carved Mars' surface features
Climate cycles running water carved Mars surface features
2016/12/13
Dramatic climate cycles on early Mars, triggered by buildup of greenhouse gases, may be the key to understanding how liquid water left its mark on the planet's surface, according to a team of planetar...
The HARPS search for southern extra-solar planets. XXXI. Magnetic activity cycles in solar-type stars: statistics and impact on precise radial velocities
Planetary systems – Stars: activity – Stars: chromospheres – Line: profi les – Techniques: radial velocities – Techniques:spectroscopic
2011/10/17
Context. Searching for extrasolar planets through radial velocity measurements relies on the stability of stellar photospheres. Aims. We aim at characterizing the statistical properties of magnetic ac...
The HARPS search for southern extra-solar planets. XXX. Planetary systems around stars with solar-like magnetic cycles and short-term activity variation
stars: planetary systems – techniques: radial velocities – stars: activity – stars: individual: HD7199 – stars: individual
2011/9/30
We present the discovery of four new long-period planets within the HARPS high-precision sample: \object{HD137388}b ($M\sin{i}$ = 0.22 $M_J$), \object{HD204941}b ($M\sin{i}$ = 0.27 $M_J$), \object{HD7...
Global magnetic cycles in rapidly rotating younger suns
Global magnetic cycles rapidly rotating younger suns
2011/1/13
Observations of sun-like stars rotating faster than our current sun tend to exhibit increased magnetic activity as well as magnetic cycles spanning multiple years. Using global simulations in spherica...
Dynamos in Stellar Convection Zones: of Wreaths and Cycles
Dynamos Stellar Convection Zones Wreaths and Cycles
2010/11/15
We live near a magnetic star whose cycles of activity are driven by dynamo action beneath the surface. In the solar convection zone, rotation couples with plasma motions to build
highly organized mag...
Multi-timescale Solar Cycles and the Possible Implications
Solar cycle — Sun extrapolation — Sun flares
2010/11/11
Based on analysis of the annual averaged relative sunspot number (ASN) during 1700 – 2009, 3 kinds of solar cycles are confirmed: the well-known 11-yr cycle (Schwabe cycle), 103-yr secular cycle (numb...
The State of Self-Organized Criticality of the Sun During the Last Three Solar Cycles. II. Theoretical Model
Solar and Stellar Astrophysics (astro-ph.SR)
2010/12/24
The observed powerlaw distributions of solar flare parameters can be interpreted in terms of a nonlinear dissipative system in the state of self-organized criticality (SOC).