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Published April 4, 2001 | Published
Journal Article Open

Polar surges and macrospicules II. Dynamics of an eruptive event from off-limb observations

Abstract

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.

Additional Information

© 2001 ESO. Received: 15 December 2000. Accepted: 23 January 2001. We would like to thank Dr. R. N. Smartt, the T.A.C. of NSO/SP and the staff of the Sacramento Peak Observatory for their warm hospitality and their help obtaining the observations. Further, we would like to thank the referee (Dr. H. Wöhl) for his suggestions that helped improve the paper. This work was partially supported by NSF grant ATM-9726147.

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August 19, 2023
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