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The variability of magnetic activity in solar‐type stars
Fabbian, D.,Simoniello, R.,Collet, R.,Criscuoli, S.,Korhonen, H.,Krivova, N. A.,Olá,h, K.,Jouve, L.,Solanki, S. K.,Alvarado‐,Gó,mez, J. D.,Booth, R.,Garcí,a, R. A.,Lehtinen, J. WILEY‐VCH Verlag GmbH Co. KGaA 2017 Astronomische Nachrichten Vol.338 No.7
<P>This article reviews the current knowledge and status of investigations on the variable magnetic activity of cool stars. We discuss the Sun in the context of solar‐type stars, highlighting peculiarities and common features in terms of its magnetic activity and variability over different time scales. We examine how both theory and observations are providing new clues about the main physical processes that generate magnetic fields in the interior of cool stars, as well as about those that lead to evolving stellar surface magnetism and varying chromospheric and coronal phenomena. We then proceed to discuss the relations between stellar age, rotation, and activity throughout the evolution of cool stars. Finally, we touch upon the importance of understanding stellar magnetism also in view of its effect on planetary environments.</P>
A MEASUREMENT OF THE COSMIC MICROWAVE BACKGROUND B-MODE POLARIZATION WITH POLARBEAR
ADE, P.A.R.,AKIBA, Y.,ANTHONY, A.E.,ARNOLD, K.,ATLAS, M.,BARRON, D.,BOETTGER, D.,BORRILL, J.,CHAPMAN, S.,CHINONE, Y.,DOBBS, M.,ELLEFLOT, T.,ERRARD, J.,FABBIAN, G.,FENG, C.,FLANIGAN, D.,GILBERT, A.,GRA The Korean Astronomical Society 2015 天文學論叢 Vol.30 No.2
POLARBEAR is a ground-based experiment located in the Atacama desert of northern Chile. The experiment is designed to measure the Cosmic Microwave Background B-mode polarization at several arcminute resolution. The CMB B-mode polarization on degree angular scales is a unique signature of primordial gravitational waves from cosmic inflation and B-mode signal on sub-degree scales is induced by the gravitational lensing from large-scale structure. Science observations began in early 2012 with an array of 1.274 polarization sensitive antenna-couple Transition Edge Sensor (TES) bolometers at 150 GHz. We published the first CMB-only measurement of the B-mode polarization on sub-degree scales induced by gravitational lensing in December 2013 followed by the first measurement of the B-mode power spectrum on those scales in March 2014. In this proceedings, we review the physics of CMB B-modes and then describe the Polarbear experiment, observations, and recent results.