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  Report - ST4.6 Pc1 Pearl Waves: Discovery, Morphology and Physics

In total, 34 abstracts were submitted to this Session. Finally 8 oral and 21 poster presentations were given at three sub-sessions. The attendance at the afternoon oral session on April 4 was about 80 people and at the evening oral session 40-60 people. The poster session on April 6 was also actively visited by the Assembly participants.

The most excellent presentations covered all sub-topics of the Session. The talks on the discoveries of the Pc1 pearl waves in 1936 by Eyvind Sucksdorff and Leiv Harang and hydromagnetic waves in 1942 by Hannes Alfven gave a good background to the reviews of the observational and theoretical progresses in the field of pearl waves. Ground-based and satellite observations were sufficiently summarized. Several papers dealt with the man-made and bio-medical influences showing the wide range of interest among the scientists.

It proved that the pearl waves are still a mystery to the science and no unique theoretical explanation is available. However, it has been shown that they play an important role in solar-terrestrial relations. Some new directions of research seem most interesting as exciting observations and theoretical approaches relevant to other planets and celestial objects were presented. It is quite clear that the research in the field of pearl waves is still most vital after the 70 years from their discovery.

The papers presented at the Session are planned to get published in a Special Issue of the Journal of Atmospheric and Solar-Terrestrial Physics. The deadline for the submission of the manuscripts is July 3, 2006 and it is expected that the Special Issue will be published in the spring 2007.

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