ESAC SOHO Science Archive Tutorial

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THE TUTORIALTHE AIMThe aim of this tutorial is to exploreSOHO images of the sun (downloadedfrom the SOHO Science Archive), watchthe evolution of sunspots, and finally todetermine the differential rotation of theSun at different latitudes.7
2 DETERMINING THE SOLAR DIFFERENTIALROTATIONThis tutorial can be found online at:http://www.sciops.esa.int/SD/ESAVO/docs/SSA_SolarDiffRotation_Tutorial.pdfTOOLS USED:The SOHO Science Archive: the SOHO Science Archive (SSA) contains all the datafrom the SOHO spacecraft. Using the SSA it is possible to easily search for data, aswell as make time animations from images of the Sun.Aladin: Aladin is a Virtual Observatory interactive sky atlas tool for interactive imageand catalogue visualisation.1. Open the SOHO Science Archive:http://ssa.esac.esa.int/ssa/ssa.jnlpAnd open Aladin:http://aladin.u-strasbg.fr/java/nph-aladin.pl?frame=downloading(either download the version for your computer operating system, or open the WebStart: http://aladin.u-strasbg.fr/java/nph-aladin.pl?frame=get&id=aladin.jnlp )2. Using the SOHO Science Archive (SSA), we are able to download images of the Suntaken by the SOHO satellite, and to build movies, with just a few clicks of thebutton!3. Firstly, we are going to take a look the sunspots by building a movie. In the mainmenu of the SOHO Science Archive, select Windows -> Time Animator:4. The Time Animator window now opens. In the Instrument/Filter box select MDIContinuum, change the Resolution to 1024 and change the ‘Max Number of EvenlySpaced Images’ to 300:8
Page 1 and 2: SCIENCE ARCHIVES AND VO TEAMESAC SO
Page 3 and 4: Table of contents1 BACKGROUND .....
Page 5 and 6: 1 BACKGROUND1.1 SUNSPOTS• Sunspot
Page 7: the Sun, they’d be the same in th
Page 11 and 12: 13. CALCULATING THE SOLAR DIFFERENT
Page 13 and 14: 24. Click the 'OK' button and go ba
Page 15 and 16: 41. The observation details for thi
Page 17 and 18: saved in, these formats also contai
Page 19 and 20: 62. Record your values with the oth
Page 21 and 22: 81. Select from the main menu 'Imag
Page 23 and 24: 94. RESULTS:2005 dataset: Period is
Page 25 and 26: 2005/01/17 16:00Use the grids to es
Page 27 and 28: 2010/01/02 18:42Then carry on follo
Page 29 and 30: 3 TROUBLESHOOTING TIPSHere we list

ESAC SOHO Science Archive Tutorial

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