EDP Sciences
Free access
Volume 370, Number 1, April IV 2001
Page(s) 273 - 280
Section The Sun
DOI http://dx.doi.org/10.1051/0004-6361:20010228

A&A 370, 273-280 (2001)
DOI: 10.1051/0004-6361:20010228

Polar surges and macrospicules

II. Dynamics of an eruptive event from off-limb observations
A. A. Georgakilas1, S. Koutchmy2 and E. B. Christopoulou3

1  Solar Astronomy, California Institute of Technology, Pasadena, CA 91125, USA
2  Institut d'Astrophysique de Paris, CNRS, 98bis boulevard Arago, 75014 Paris, France
    e-mail: koutchmy@iap.fr
3  Electronics Laboratory, University of Patras, Patras 26110, Greece
    e-mail: echris@physics.upatras.gr

(Received 15 December 2000 / Accepted 23 January 2001 )

We continue our study of polar surges and macrospicules at the period of solar minimum, analyzing high resolution multiwavelength limb observations that provide a clearer picture of the dynamical phenomena occurring well above the chromosphere of a polar cap. The time sequence of an erupting and impulsive polar event is examined from the low chromosphere to coronal heights, deriving both proper motions and Doppler velocities. Our observations suggest that there is a close association of polar surges with explosive events, supporting the hypothesis that magnetic reconnection triggered by emerging flux provides the accelerative mechanism for this polar region event.

Key words: Sun: chromosphere, transition region

Offprint request: A. A. Georgakilas, ageorg@caltech.edu

© ESO 2001