Discovery of Scattering Polarization in the Hydrogen Lyα Line of the Solar Disk Radiation

被引：50

作者：

Kano, R. ^{[1
]}

Trujillo Bueno, J. ^{[2
,4
,6
]}

Winebarger, A. ^{[3
,9
,13
,15
,16
]}

Auchere, F. ^{[8
,10
]}

Narukage, N. ^{[2
,7
,11
,14
]}

Ishikawa, R. ^{[4
,5
,6
,17
]}

Kobayashi, K. ^{[16
]}

Bando, T. ^{[1
,2
,3
,13
,15
,17
,19
]}

Katsukawa, Y. ^{[1
,3
,4
,5
,6
,7
,9
]}

Kubo, M. ^{[2
,8
,10
,11
,15
,16
,18
]}

Ishikawa, S. ^{[5
,7
,13
,14
,16
,19
]}

Giono, G. ^{[1
]}

Hara, H. ^{[1
]}

Suematsu, Y. ^{[8
,9
]}

Shimizu, T. ^{[1
,11
,14
]}

Sakao, T. ^{[7
]}

Tsuneta, S. ^{[7
]}

Ichimoto, K. ^{[9
]}

Goto, M. ^{[1
]}

Belluzzi, L. ^{[11
,12
]}

Stepan, J. ^{[13
]}

Asensio Ramos, A. ^{[3
]}

Sainz, R. Manso ^{[1
]}

Champey, P. ^{[15
]}

Cirtain, J. ^{[16
]}

De Pontieu, B. ^{[17
]}

Casini, R. ^{[18
]}

Carlsson, M. ^{[19
]}

机构：

[1] Natl Astron Observ Japan, Mitaka, Tokyo 1818588, Japan

[2] Inst Astrofis Canarias, E-38205 San Cristobal la Laguna, Spain

[3] Univ Laguna, Dept Astrofis, Tenerife, Spain

[4] CSIC, Tenerife, Spain

[5] NASA, Marshall Space Flight Ctr, Huntsville, AL 35812 USA

[6] Univ Paris Sud, Inst Astrophys Spatiale, F-91405 Orsay, France

[7] Japan Aerosp Explorat Agcy, Inst Space & Astronaut Sci, Sagamihara, Kanagawa, Japan

[8] Grad Univ Adv Studies Sokendai, Hayama, Kanagawa 2400193, Japan

[9] Kyoto Univ, Observ, Gifu 5061314, Japan

[10] Natl Inst Fus Sci, Toki, Gifu 5095292, Japan

[11] Ist Ric Solari Locarno, CH-6605 Fribourg, Switzerland

[12] Kiepenheuer Inst Sonnenphys, Freiburg, Germany

[13] Acad Sci, Astron Inst, Ondrejov, Czech Republic

[14] Planck Inst Sonnensyst Forsch, Justus von Liebig Weg 3, D-37077 Gottingen, Germany

[15] Univ Alabama Huntsville, 301 Sparkman Dr, Huntsville, AL 35899 USA

[16] Univ Virginia, Dept Astron, 530 McCormick Rd, Charlottesville, VA 22904 USA

[17] Lockheed Martin Solar Astrophys Lab, Palo Alto, CA 94304 USA

[18] Natl Ctr Atmospher Res, High Altitude Observ, Post Off Box 3000, Boulder, CO 80307 USA

[19] Univ Oslo, NO-0315 Oslo, Norway

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2017年 / 839卷 / 01期

关键词：

magnetic fields; polarization; Sun: chromosphere; Sun: transition region; Sun: UV radiation;

D O I：

10.3847/2041-8213/aa697f

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

There is a thin transition region (TR) in the solar atmosphere where the temperature rises from 10,000 K in the chromosphere to millions of degrees in the corona. Little is known about the mechanisms that dominate this enigmatic region other than the magnetic field plays a key role. The magnetism of the TR can only be detected by polarimetric measurements of a few ultraviolet (UV) spectral lines, the Ly alpha line of neutral hydrogen at 121.6. nm (the strongest line of the solar UV spectrum) being of particular interest given its sensitivity to the Hanle effect (the magnetic-field-induced modification of the scattering line polarization). We report the discovery of linear polarization produced by scattering processes in the Ly alpha line, obtained with the Chromospheric Lyman-Alpha Spectro-Polarimeter (CLASP) rocket experiment. The Stokes profiles observed by CLASP in quiet regions of the solar disk show that the Q/I and U/I linear polarization signals are of the order of 0.1% in the line core and up to a few percent in the nearby wings, and that both have conspicuous spatial variations with scales of similar to 10. arcsec. These observations help constrain theoretical models of the chromosphere-corona TR and extrapolations of the magnetic field from photospheric magnetograms. In fact, the observed spatial variation from disk to limb of polarization at the line core and wings already challenge the predictions from three-dimensional magnetohydrodynamical models of the upper solar chromosphere.

引用

页数：6

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