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Velocity fluctuations in polar solar wind: a comparison between different solar cycles

Bavassano, B.; Bruno, R.; D'Amicis, R.

The polar solar wind is a fast, tenuous and steady flow that, with the exception of a relatively short phase around the Sun's activity maximum, fills the high-latitude heliosphere. The polar wind properties have been extensively investigated by Ulysses, the first spacecraft able to perform in-situ measurements in the high-latitude heliosphere. The…