Observations of rotating sunspots from TRACE

Daniel Stephen Brown, RW Nightingale, D Alexander, CJ Schrijver, TR Metcalf, RA Shine, AM Title, CJ Wolfson

Research output: Contribution to journalArticlepeer-review

158 Citations (Scopus)

Abstract

Recent observations from TRACE in the photospheric white-light channel have shown sunspots that rotate up to 200degrees about their umbral centre over a period of 3-5 days. The corresponding loops in the coronal fan are often seen to twist and can erupt as flares. In an ongoing study, seven cases of rotating sunspots have been identified, two of which can be associated with sigmoid structures appearing in Yohkoh/SXT and six with events seen by GOES. This paper analyzes the rotation rates of the sunspots using TRACE white-light data. Observations from AR 9114 are presented in detail in the main text and a summary of the results for the remaining six sunspots is presented in Appendixes A-F. Discussion of the key results, particularly common features, are presented, as well as possible mechanisms for sunspot rotation.

Original languageEnglish
Pages (from-to)79-108
Number of pages30
JournalSolar Physics
Volume216
Issue number1-2
DOIs
Publication statusPublished - Sept 2003

Keywords

  • KINK INSTABILITY
  • CORONAL LOOPS
  • MAGNETIC RECONNECTION
  • NUMERICAL SIMULATIONS
  • SOLAR CORONA
  • FLUX TUBE
  • FLARE
  • EVOLUTION
  • TWIST
  • ZONE

Fingerprint

Dive into the research topics of 'Observations of rotating sunspots from TRACE'. Together they form a unique fingerprint.

Cite this