{"id":423,"date":"2017-01-17T10:17:22","date_gmt":"2017-01-17T10:17:22","guid":{"rendered":"https:\/\/gregor.aip.de\/cms\/?p=423"},"modified":"2017-01-19T10:45:46","modified_gmt":"2017-01-19T10:45:46","slug":"poster-presentation-center-to-limb-variation-of-the-velocity-field-in-and-around-a-sunspot-with-light-bridges-at-solarnet-4","status":"publish","type":"post","link":"https:\/\/gregor.aip.de\/cms\/poster-presentation-center-to-limb-variation-of-the-velocity-field-in-and-around-a-sunspot-with-light-bridges-at-solarnet-4\/","title":{"rendered":"Poster Presentation \u00bbCenter-to-Limb Variation of the Velocity Field in and around a Sunspot with Light-Bridges\u00ab at SOLARNET 4"},"content":{"rendered":"<p style=\"text-align: justify;\"><a href=\"https:\/\/gregor.aip.de\/cms\/wp-content\/uploads\/2017\/01\/solarnet4_cdenker_poster.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-medium wp-image-427\" src=\"https:\/\/gregor.aip.de\/cms\/wp-content\/uploads\/2017\/01\/solarnet4_cdenker_poster-212x300.png\" alt=\"Poster by C. Denker at SOLARNET 4.\" width=\"212\" height=\"300\" srcset=\"https:\/\/gregor.aip.de\/cms\/wp-content\/uploads\/2017\/01\/solarnet4_cdenker_poster-212x300.png 212w, https:\/\/gregor.aip.de\/cms\/wp-content\/uploads\/2017\/01\/solarnet4_cdenker_poster-723x1024.png 723w, https:\/\/gregor.aip.de\/cms\/wp-content\/uploads\/2017\/01\/solarnet4_cdenker_poster.png 982w\" sizes=\"auto, (max-width: 212px) 100vw, 212px\" \/><\/a>Initial results obtained with the GREGOR Fabry-P\u00e9rot Interferometer (GFPI) during the \u00bbearly science phase\u00ab with the GREGOR solar telescope were presented as a <a href=\"https:\/\/gregor.aip.de\/cms\/wp-content\/uploads\/2017\/01\/solarnet4_cdenker_poster.pdf\">poster<\/a> at the SOLARNET IV Meeting \u00bbThe Physics of the Sun from the Interior to the Outer Atmosphere\u00ab, Lanzarote, Spain, 2017 January 16\u201320.<\/p>\n<p style=\"text-align: justify;\">The disk passage of active region NOAA 12121 was observed with the 1.5-meter GREGOR solar telescope (Schmidt <i>et al. <\/i>2012, AN 333, 796) during the time period 2014 July 22\u201330. On 2014 July 25 and 28, the seeing conditions were excellent so that longer time-series (30\u201390 min) were recorded approaching the diffraction limit of the telescope. The seeing conditions on the other days were variable ranging from mediocre to very good so that only snap-shots of high-quality images and imaging spectroscopy were possible. On each day, data were acquired with the GREGOR Fabry-P\u00e9rot Interferometer (GFPI, Denker et al. 2010, Proc. SPIE 7735, 77356M; Puschmann <i>et al. <\/i>2012, AN 333, 880), initially in the spectral line Fe\u202f<small>I<\/small> \u03bb630.15\u202fnm and on the last two days in the spectral line Fe\u202f<small>I<\/small> \u03bb617.34\u202fnm. Imaging spectroscopy based on spectral scans restored with Multi-Object Multi-Frame Blind Deconvolution (MOMFBD, van Noort <i>et al. <\/i>2005, SoPh 228, 191) delivered high-resolution line-of-sight (LOS) velocity maps for a field-of-view (FOV) of 50\u2033 \u00d7 38\u2033. In addition,\u00a0 we\u00a0 present\u00a0 speckle\u00a0 reconstructed images obtained with a G-band filter (\u03bb430.7\u202fnm) in the Blue Imaging Channel (BIC) of the GFPI. These images cover a FOV of 75\u2033 \u00d7 93\u2033 and were obtained with a cadence of about 30\u202fs. These data serve as input for Local Correlation Tracking (LCT, November &amp; Simon 1988, ApJ 333, 427; Verma &amp; Denker 2011, A&amp;A 529, A153) to investigate horizontal proper motions in and around the sunspots. The high-resolutions data are complemented by data from the Solar Dynamics Observatory (SDO, Pesnell <i>et al. <\/i>2012, SoPh 275, 3) and Interface Region Imaging\u00a0 Spectrograph (IRIS, de Pontieu <i>et al. <\/i>2014, SoPh 289, 2733). We study the evolution of the sunspots with an emphasis on growth and decay of individual sunspots, formation and dissolving of (rudimentary) penumbrae, and fine structure of light-bridges and umbral dots.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Initial results obtained with the GREGOR Fabry-P\u00e9rot Interferometer (GFPI) during the \u00bbearly science phase\u00ab with the GREGOR solar telescope were presented as a poster at the SOLARNET IV Meeting \u00bbThe Physics of the Sun from the Interior to the Outer Atmosphere\u00ab, Lanzarote, Spain, 2017 January 16\u201320. The disk passage of active region NOAA 12121 was [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-423","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/gregor.aip.de\/cms\/wp-json\/wp\/v2\/posts\/423","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/gregor.aip.de\/cms\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/gregor.aip.de\/cms\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/gregor.aip.de\/cms\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/gregor.aip.de\/cms\/wp-json\/wp\/v2\/comments?post=423"}],"version-history":[{"count":5,"href":"https:\/\/gregor.aip.de\/cms\/wp-json\/wp\/v2\/posts\/423\/revisions"}],"predecessor-version":[{"id":451,"href":"https:\/\/gregor.aip.de\/cms\/wp-json\/wp\/v2\/posts\/423\/revisions\/451"}],"wp:attachment":[{"href":"https:\/\/gregor.aip.de\/cms\/wp-json\/wp\/v2\/media?parent=423"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/gregor.aip.de\/cms\/wp-json\/wp\/v2\/categories?post=423"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/gregor.aip.de\/cms\/wp-json\/wp\/v2\/tags?post=423"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}