منابع مشابه
Time Distance Study of Isolated Sunspots
We present a comparative seismic study of conditions around and beneath isolated sunspots. Using the European Grid of Solar Observations’ Solar Feature Catalogue of sunspots derived from SOHO/MDI continuum and magnetogram data, 1996-2005, we identify a set of isolated sunspots by checking that within a Carrington Rotation there were no other spots detected in the vicinity. We then use level-2 t...
متن کاملNumerical models of travel-time inhomogeneities in sunspots
We investigate the direct contribution of strong, sunspot-like magnetic fields to helioseismic wave travel-time shifts via two numerical forward models, a 3D ideal MHD solver and MHD ray theory. The simulated data cubes are analyzed using the traditional time-distance center-to-annulus measurement technique. We also isolate and analyze the direct contribution from purely thermal perturbations t...
متن کاملMagnetic Structure of Sunspots
In this review we give an overview about the current state-of-knowledge of the magnetic field in sunspots from an observational point of view. We start by offering a brief description of tools that are most commonly employed to infer the magnetic field in the solar atmosphere with emphasis in the photosphere of sunspots. We then address separately the global and local magnetic structure of suns...
متن کاملSunspots in the Laboratory
We show that extrinsic or non-fundamental uncertainty influences markets in a controlled environment. This work provides the first direct evidence of sunspot equilibria. These equilibria require a common understanding of the semantics of the sunspot variable, and they appear to be sensitive to the flow of information. Extrinsic uncertainty matters when information flows slowly, as in a call mar...
متن کاملNew radio instrumentation for the study of sunspots and starspots
Much of the radio emission from the Sun and similar stars depends directly on magnetic fields for its source. For this reason, radio emission contains important diagnostic information on solar and stellar magnetic fields. This paper reviews the ways in which radio emission is sensitive to magnetic fields and discusses new radio instrumentation that will be able to exploit this information for m...
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: Astronomische Nachrichten
سال: 2007
ISSN: 0004-6337,1521-3994
DOI: 10.1002/asna.200610744