NDLI: Atmosphere Dynamics of the Active Region NOAA 11024

Content Provider	Springer Nature Link
Author	Kondrashova, N. N. Pasechnik, M. N. Chorgor, S. N. Khomenko, E. V.
Copyright Year	2012
Abstract	We present results of the study of chromospheric and photospheric line-of-sight velocity fields in the young active region NOAA 11024. Multi-layer, multi-wavelength observational data were used for the analysis of the emerging flux in this active region. Spectropolarimetric observations were carried out with the telescope THEMIS on Tenerife (Canary Islands) on 4 July 2009. In addition, space-borne data from SOHO/MDI, STEREO and GOES were also considered. The combination of data from ground- and space-based telescopes allowed us to study the dynamics of the lower atmosphere of the active region with high spatial, spectral, and temporal resolutions. THEMIS spectra show strong temporal variations of the velocity in the chromosphere and photosphere for various activity features: two pores, active and quiet plage regions, and two surges. The range of variations of the chromospheric line-of-sight velocity at the heights of the formation of the Hα core was extremely large. Both upward and downward motions were observed in these layers. In particular, a surge with upward velocities up to −73 km s$^{−1}$ was detected. In the photosphere, predominantly upward motions were found, varying from −3.1 km s$^{−1}$ upflows to 1.4 km s$^{−1}$ downflows in different structures. The velocity variations at different levels in the lower atmosphere are compatible with the emergence of magnetic flux.
Starting Page	499
Ending Page	513
Page Count	15
File Format	PDF
ISSN	00380938
Journal	Solar Physics
Volume Number	284
Issue Number	2
e-ISSN	1573093X
Language	English
Publisher	Springer Netherlands
Publisher Date	2013-01-04
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Solar active regions Chromosphere Photosphere Line-of-sight velocity Plages Surges Astrophysics and Astroparticles Atmospheric Sciences Extraterrestrial Physics, Space Sciences
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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