منابع مشابه
Stokes I and V observations of magnetic knots using bright Ca II K network points as tracers
This paper uses bright Ca II K points as markers for isolated magnetic features in the underlying solar photosphere. Stokes V polarimetry in selected photospheric lines applied to a large number of Ca II K targets yield some average results: These magnetic features are 2 to 3 arcsec in diameter, dark at disk center and bright at the limb. Their magnetic field strength is typically 1400 Gauss, w...
متن کاملCa II activity and rotation in F-K evolved stars
Ca II H and K high resolution observations for 60 evolved stars in the field and in 5 open clusters are presented. From these spectra chromospheric fluxes are derived, and a homogeneous sample of more than 100 giants is built adding data from the literature. In addition, for most stars, rotational velocities were derived from CORAVEL observations. By comparing chromospheric emission in the clus...
متن کاملSPECTROSCOPIC MEASUREMENTS OF DYNAMIC FIBRILS IN THE Ca ii k8662 LINE
We present high spatial resolution spectroscopic measurements of dynamic fibrils (DFs) in the Ca ii k8662 line. These data show clear Doppler shifts in the identified DFs, which demonstrates that at least a subset of DFs are actual mass motions in the chromosphere. A statistical analysis of 26 DFs reveals a strong and statistically significant correlation between the maximal velocity and the de...
متن کاملSpectroscopic Measurements of Dynamic Fibrils in the Ca Ii 8662 Å Line
We present high spatial resolution spectroscopic measurements of dynamic fibrils (DFs) in the Ca II 8662 Å line. These data show clear Doppler shifts in the identified DFs, which demonstrates that at least a subset of DFs are actual mass motions in the chromosphere. A statistical analysis of 26 DFs reveals a strong and statistically significant correlation between the maximal velocity and the d...
متن کاملNa-Ca or Na-Ca-K exchange in rod photoreceptors.
Remarkably dynamic Ca z ÷ fluxes control Ca 2 ÷ homeostasis in the outer segments of vertebrate rod photoreceptors (ROS). Ca 2 ÷ fluxes are believed to be carried by only two different membrane proteins embedded in the ROS plasma membrane; these two proteins as well as some of the other main molecular components of ROS are schematically depicted in Fig. 1. ROS are the sites of the process of vi...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2009
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/200811155