Repetitive occurrence of explosive events at a coronal hole boundary

Details Repetitive occurrence of explosive events at a coronal hole boundary Repetitive occurrence of explosive events at a coronal hole boundary

Jan 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...446..327d&link_type=abstract

Astronomy and Astrophysics, Volume 446, Issue 1, January IV 2006, pp.327-331

Astronomy and Astrophysics

Astrophysics

22

Sun: Activity:, Sun: Oscillations, Sun: Transition Region, Sun: Uv Radiation, Line: Profiles

Scientific paper

SUMER/SoHO data taken at a coronal hole boundary show a repetitive explosive event occurrence rate of around 3 min increasing to over 5 min towards the end of the activity. We suggest that the neighbouring oppositely directed closed and open field lines at the coronal hole boundary undergo repetitive reconnection seen as a sequence of explosive events. The repetitive reconnection may be triggered by transverse oscillations of the flux tubes in the closed field line region. These oscillations periodically separate and bring together the closed and open field lines on the two sides of the coronal hole boundary. An important indicator favouring the interpretation in terms of a kink mode is the observed increase in the oscillation period.

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