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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...
Magnetic Fields in Earth-like Exoplanets and Implications for Habitability around M-dwarfs
magnetic fields exoplanets habitability
2011/10/9
We present estimations of dipolar magnetic moments for terrestrial exoplanets using the Olson & Christiansen (2006) scaling law and assuming their interior structure is similar to Earth. We find that ...
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...
Solar Magnetic Fields
Solar Magnetic Fields
2011/9/28
This review provides an introduction to the generation and evolution of the Sun's magnetic field, summarising both observational evidence and theoretical models. The eleven year solar cycle, which is ...
Observational Study of Solar Magnetic Active Phenomena
Sun: activity flares magnetic fields
2010/9/17
The electric current separated into two parts reflected the quantative properties of heterogeneity and chirality of magnetic field, and defined them as the shear and twist components of current. We an...
Initiation of CMEs by Magnetic Flux Emergence
Sun: corona coronal mass ejections magnetic fields magnetohydrodynamics flux emergence
2010/9/16
The initiation of solar Coronal Mass Ejections (CMEs) is studied in the framework of numerical magnetohydrodynamics (MHD).The initial CME model includes a magnetic flux rope in spherical, axisymmetric...
Magnetic Source Regions of Coronal Mass Ejections
Coronal mass ejection flare filament eruption
2010/9/16
The majority of flare activity arises in active regions which contain sunspots, while Coronal Mass Ejection (CME) activity can also originate from decaying active regions and even so-called quiet sola...
Role of Magnetic Carpet in Coronal Heating
Sun—corona—magnetic field—magnetic carpet—reconnection
2010/9/16
One of the fundamental questions in solar physics is how the solar corona maintains its high temperature of several million Kelvin above photosphere with a temperature of 6000 K.
Observations show th...
Seismic Study of Magnetic Field in the Solar Interior
Sun oscillations interior magnetic field
2010/9/15
Magnetic field in the solar interior contributes to the even order splitting coefficients, but it is not possible to separate the effect of magnetic field from those due to other deviations from spher...
The Evolution of Vector Magnetic Field Associated with Major Flares in NOAA AR10656
Magnetic field evolution flares
2010/9/15
In this paper, we study the evolution of vector magnetic field of AR 10656 by using the observations of Huairou Solar Observing Station (HSOS, China) and Big Bear Solar Observatory (BBSO, USA).The mag...
Concept of magnetic/current helicity was introduced to solar physics about 15 years ago. Earlier studies led to discovery of such fundamental properties as hemispheric helicity rule, and role of helic...
Since the structuring and variability of the Sun and other stars are governed by magnetic fields, much of present-day stellar physics centers around the measurement and understanding of the magnetic f...
The Sun's magnetic field warps its environment（图）
The Sun's magnetic field environment astronauts
2010/9/21
The Sun's extended magnetic field provides a vital shield for astronauts; without it they would be left exposed to potentially deadly cosmic rays entering in from outside the solar system. Now, a grou...
Explained: Dynamo theory--Recent discoveries raise questions about how small planets can have self-sustaining magnetic fields（图）
Dynamo theory small planets self-sustaining magnetic fields
2010/4/21
The Earth’s global magnetic field is generated in its metallic core, located nearly 3,000 kilometers beneath the planet’s surface. The field has existed on Earth for at least 3.5 billion years and off...
MHD Stabiblity of a Solar Prominence Embedded in an External Vertical Magnetic Field
Solar Prominence Embedded External Vertical Magnetic Field
2009/6/30
MHD Stabiblity of a Solar Prominence Embedded in an External Vertical Magnetic Field。