Solar Physics

, Volume 128, Issue 2, pp 365–369 | Cite as

High latitude helical surge of May 22, 1989

  • Adnan Ökten
  • Hikmet Çakmak


A helical surge (S 72, W 90) was recorded by a monochromatic filter at the University Observatory of Istanbul. It is a significient one at a very high latitude and without any center of activity. A sequence of the filtergrams showed some condensed points from which the motions of the plasma are traced. Different velocities were determined on each of the branches of the helical surge during its evolution. The surge reached its maximum height of 298 000 km and the maximum velocity of this upper region was 250 km s−1.


High Latitude Maximum Velocity Maximum Height Condensed Point Monochromatic Filter 
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Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • Adnan Ökten
    • 1
  • Hikmet Çakmak
    • 1
  1. 1.Department of Astronomy and Space Sciences, Faculty of ScienceUniversity of IstanbulIstanbulTurkey

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