Alfven Instability in coronal loops with siphon flows

Research output: Contribution to journalArticlepeer-review

11 Citations (SciVal)
157 Downloads (Pure)


A new magnetohydrodynamic (MHD) instability in coronal loops is presented. It is demonstrated that small-amplitude torsional Alfvénic disturbances generated by random photospheric motions are inevitably amplified in asymmetrically stratified loops with siphon flows. The loop asymmetry and the flow speeds can be arbitrarily small. The growth rates linked with the instability increase with increasing flow speeds. The instability is caused by over-reflection of Alfvén waves at the transition region where steep variations in density exist.
Original languageEnglish
Pages (from-to)69-75
Number of pages7
JournalAstrophysical Journal
Issue number1
Publication statusPublished - 20 Mar 2009


  • instabilities
  • MHD
  • Sun: atmosphere


Dive into the research topics of 'Alfven Instability in coronal loops with siphon flows'. Together they form a unique fingerprint.

Cite this