Solar and stellar activity
Variability of solar/stellar activity and magnetic field and its influence on planetary atmosphere evolution
... the solar wind As a consequence of solar/stellar activity, plasma winds are ejected from the star but their detection in solar proxies is very ...the stellar wind speed reaches ...
21
Seismological insights into solar and stellar magnetic activity cycles
... magnetic activity as- sociated with the 11yr solar cycle is also concentrated near the solar equator this means that the frequencies of the sec- toral components are shifted by a larger amount than ...
9
Constraining stellar physics from red-giant stars in binaries – stellar rotation, mixing processes and stellar activity
... of stellar structure and evolution - in particular for solar-like oscillators in this ...the stellar rotation, dynamics and rotational mixing of elements and allows us to learn from the differ- ences ...
9
Disentangling stellar activity from exoplanetary signals with interferometry
... a solar-type star [1] has opened up the wide field of ex- oplanet detection and ...the stellar mass, M p sin( i )/M , the second one gives the ratio of their radii, R p /R ...the stellar parameters, M ...
5
The connection between stellar activity cycles and magnetic field topology
... how activity cycles evolve over the stellar lifetime (Ol´ah et ...determining activity cycle periods is long term monitoring of stellar magnetic ...chromospheric activity cy- ...
9
Transiting the Sun II The impact of stellar activity on Lyα transits
... s Solar Dynamics Observatory / EVE instrument to assess the impact of stellar activity on the measured planet-to-star radius ratio ( R p / R å ) ...with activity levels comparable to the Sun, ...
7
The connection between stellar activity cycles and magnetic field topology
... A second option for determining activity cycle periods is long term monitoring of stellar magnetic fields. On the Sun, sunspots oc- cur as a result of emerging flux and reflect the underlying magnetic field ...
9
Role of longitudinal activity complexes for solar and stellar dynamos
... the activity should manifest itself at the same ...the solar hemispheres behave in a decoupled manner, and usually only a fraction of the whole latitudinal extent is seen of other ...of solar ...
Stellar magnetism and activity : from stellar interiors to orbiting exoplanets
... 5.4. Conclusion sider two reasonable values of magnetospheric size. These are the present day magnetosphere size, 10.2 R E , and its size 3.4 Gyr ago, estimated to be between 5 R E and 7 R E . Using the wind models of ...
162
The formation and eruption of magnetic flux ropes in solar and stellar coronae
... as solar activity. The Sun-Earth connection, mediated by the solar wind – a flow of particles away from the Sun into interplanetary space – has major effects on modern ...and solar flares can ...
280
Estimating the frequency of extremely energetic solar events, based on solar, stellar, lunar, and terrestrial records
... of stellar flare observations. We conclude that solar flare energies form a relatively smooth distribution from small events to large flares, while flares on magnetically active, young Sun-like stars have ...
17
Astronomy of Solar Activity and Photospersion
... low-degree solar p-mode shifts in May 2005, Keith MacGregor and Margarida Cunha for thoughtful discussions, and the Copernicus Astronomical Centre for fostering this collab- oration during a sponsored visit in ...
5
Stellar, solar, and lunar demonstrators
... Depending on their age, most students can understand fairly easily why some stars appear circumpolar from the city where they live. However, it is much more dif- ficult for them to imagine which ones would appear ...
14
Stellar evolution and the Standard Solar Model
... The stellar gas pressure is mainly due to its ...consecutive stellar contractions when the star passes from one “equilibrium” state to another one, while its internal temperature ...the stellar mass ...
13
Stellar magnetic activity and exoplanets
... magnetic activity and exoplanets ...magnetic activity could be enhanced due to interactions between close-in massive planets and their host ...between stellar magnetic activity and exoplanets. ...
6
Quasi periodic pulsations in solar and stellar flares
... for solar flares than stellar flares. Solar flares can be observed more easily and more of their fine structure revealed, whereas the intensity and time resolution of stellar flare ...
201
Acoustic oscillations in solar and stellar flaring loops
... However, numerical simulations discussed above, as well as re- cently gained abundant observational evidence of the presence of acoustic waves in the solar corona, suggest that the observed periodicities can be ...
5
Acoustic oscillations in solar and stellar flaring loops
... However, numerical simulations discussed above, as well as re- cently gained abundant observational evidence of the presence of acoustic waves in the solar corona, suggest that the observed periodicities can be ...
5
Waves and Turbulences in Solar and Stellar Atmospheres and Winds
... driving solar wind as well as stellar winds from solar-type ...the stellar surfaces due to the convective motions, and these waves dissipate through various nonlinear processes such as ...
7
Disentangling stellar activity and planetary signals
... We use the 37 last days of HARPS data in order for the distribution of spots on the stellar surface not to change too much. We simultaneously fit three sinusoids for the active jitter with periods fixed at the ...
6