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The Solar Terrestrial Activity Report

Stay updated with detailed sunspot analysis, magnetic delta structures, and group boundaries. Receive daily reports since 1997 on solar activity. Easily enhance spot analysis with magnetic overlays. Early detection leads to better solar data quality. Explore SDO sunspot numbers and solar cycle progress.

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The Solar Terrestrial Activity Report

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  1. TheSolar Terrestrial Activity Report www.solen.info/solar/

  2. History • ~1995 – monthly report (paper) • 1997 – daily reports (Internet) • 2002 – detailed sunspot analysis • 2002 – archive of daily reports • 2002 – Coronal hole numbering and archive • 2010 – Switch from SOHO to SDO as image source • 2010 – Sunspot number using 2K SDO continuum images • 2011 – Sunspot analysis using polarity overlays • 2012 – Added 1K SDO sunspot number. Sunspot image documentation at 1, 2 and 4K resolution

  3. Coronal holes • Visible disk observations • Inferred (behind the limbs)

  4. Sunspots – image creation • Using magnetic overlays greatly aids spot analysis – both at the overview and detailed level = + The transformation from 2 images to the magnetic overlay image only requires a few steps. Easily done in Gimp or Photoshop

  5. Sunspots – magnetic deltas • Quickly detect magnetic delta structures AR 11515 developed many magnetic delta structures in early July 2012 AR 11515 produced 1 X and 6 M class flares on July 6

  6. Sunspots – group boundaries • Using magnetic boundaries instead of longitudinal separation when determining possible splits Magnetically one group Locarno split into 2 groups (77/78), presumably because of longitudinal separation of spots, see http://www.specola.ch/drawings/2012/loc-d20120326.JPG

  7. Early detection improves quality of related solar data Sunspots – early detection NOAA recorded a C5.8 flare at 17:07 UTC on January 18 and attributed it to AR 11654. SDO/EVE SAM confirms that the flare occurred in AR S2181 (now 11660)

  8. Sunspots – high latitude obs. AR S2052, location: N42E30 Easily observed in 1K resolution on Nov.14, 2012 AR S1968, location: N51E04 Poorly defined spot, observed in 2K on October 8, 2012 AR S1578, location: S41E22 Several spots in 2K, one in 1K resolution. Observed on April 10, 2012

  9. Solar cycle charts Comparison with similar cycles Cycle 24 progress, current status Smoothed max in Feb.’12: 66.9NH smoothed max in Sept.’11: 41.3 SH smoothed max in April ’12: 30.1

  10. Performance of STAR-SDO sunspot numbers in 2012 • Similar development as SIDC and NOAA

  11. Monthly K factors in 2012 • Peak in March for STAR-SDO and NOAA

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