Effects of Solar Active Regions on Meridional Flows
نویسندگان
چکیده
منابع مشابه
Alleviating α quenching by solar wind and meridional flows
Aims. We study the ability of magnetic helicity expulsion to alleviate catastrophic α-quenching in mean field dynamos in two– dimensional spherical wedge domains. Methods. Motivated by the physical state of the outer regions of the Sun, we consider α2Ω mean field models with a dynamical α quenching. We include two mechanisms which have the potential to facilitate helicity expulsion, namely adve...
متن کاملOn rotationally driven meridional flows in stars
A quasi-steady-state model of the consequences of rotation on the hydrodynamical structure of a stellar radiative zone is derived by studying in particular the role of centrifugal and baroclinic driving of meridional motions in angular momentum transport. This non-linear problem is solved numerically, assuming axial symmetry of the system, and within some limits it is shown that there exist sim...
متن کاملThe Magnetic Classification of Solar Active Regions
The purpose of this letter is to address a blind-spot in our knowledge of solar active region statistics. To the best of our knowledge there are no published results showing the variation of the Mount Wilson magnetic classifications as a function of solar cycle based on modern observations. We show statistics for all active regions reported in the daily Solar Region Summary from 1992 January 1 ...
متن کاملThe Transparency of Solar Coronal Active Regions
Resonance scattering has often been invoked to explain the disagreement between the observed and predicted line ratios of Fe XVII λ15.01 to Fe XVII λ15.26 (the “3C/3D” ratio). In this process photons of λ15.01, with its much higher oscillator strength, are preferentially scattered out of the line of sight, thus reducing the observed line ratio. Recent laboratory measurements, however, have foun...
متن کاملAutomatic Detection of Active Regions on Solar Images
In this paper techniques are described for the automated detection of solar Active Regions (ARs). AR detection is achieved using intensity thresholds and a region growing procedure. These procedures have been tested on full-disk solar images from the Meudon observatory for the months of April and July 2002 and compared with their manually generated synoptic maps. Comparisons were also made with...
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: The Astrophysical Journal
سال: 2008
ISSN: 0004-637X,1538-4357
DOI: 10.1086/589997