Detection of high-latitude waves of solar coronal activity in extreme-ultraviolet data from the solar and Heliospheric observatory EUV imaging telescope

E. E. Benevolenskaya, A. G. Kosovichev, P. H. Scherrer

Research output: Contribution to journalArticlepeer-review

52 Scopus citations

Abstract

We present the results of an investigation of EUV coronal structures in 1996-2000 using the Solar and Heliospheric Observatory EIT data in 171, 195, 284, and 304 Å lines. During this period, poleward-and equatorward-migrating waves of solar activity have been found in axisymmetrical distributions of EUV intensity in all four lines. In the axisymmetrical distribution of the ratio of 195 Å to 171 Å intensities, which is a proxy of coronal temperature from 1 × 106 to 2 × 106 K, the polar branches are less prominent. The high-latitude activity waves are caused by giant coronal magnetic loops connecting the polar magnetic field (formed during the preceding solar cycle) with the magnetic field of the "following" parts of active regions that emerged during the rising phase of the current cycle. We suggest that these coronal loops play an important role in the topological evolution of the magnetic structure of the Sun during the solar cycle.

Original languageEnglish (US)
Pages (from-to)L107-L110
JournalAstrophysical Journal
Volume554
Issue number1 PART 2
DOIs
StatePublished - Jun 10 2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Keywords

  • Sun: activity
  • Sun: interior
  • Sun: magnetic fields
  • Sun: rotation
  • Sunspots

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