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Marianne's Arctic Xpress in Tromsø offers fjord, whale and wildlife tours by day, aurora tours by night. For reasons that researchers don't fully understand, geomagnetic storms love equinoxes.Book Now and get a 10% discount on combo day and night adventures. At this time of year, even a gentle gust of solar wind can spark a bright display of lights around the Arctic circle.More: Autumn is Aurora Season is now reporting data you won't find anywhere else: Regular measurements of cosmic rays at aviation altitudes.

En route to the stratosphere over California the payload passes through aviation altitudes.

Here are 18 months' worth of data at 25,000 ft and 40,000 ft: In this plot, dose rates are expressed as multiples of sea level.

For instance, we see that boarding a plane that flies at 25,000 feet exposes passengers to dose rates ~10x higher than sea level. Cosmic rays and solar activity have a yin-yang relationship.

When the sun grows quiet (as it has been doing), cosmic rays increase.

We have already observed this effect in the stratosphere, where radiation levels have increased by more than 12% since 2015.

Last modified 21-Jun-2015 03:27