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Now, however, the solar cycle is swinging toward Solar Minimum, allowing cosmic rays to return.
Another reason could be the weakening of Earth's magnetic field, which helps protect us from deep-space radiation.
To measure radiation on airplanes, we use the same sensors we fly to the stratosphere onboard Earth to Sky Calculus cosmic ray balloons: neutron bubble chambers and X-ray/gamma-ray Geiger tubes sensitive to energies between 10 ke V and 20 Me V.It's called E-RAD--short for Empirical RADiation model.We are constantly flying radiation sensors onboard airplanes over the US and and around the world, so far collecting more than 22,000 gps-tagged radiation measurements.Approximately once a week, and the students of Earth to Sky Calculus fly space weather balloons to the stratosphere over California.These balloons are equipped with radiation sensors that detect cosmic rays, a surprisingly "down to Earth" form of space weather.
According to a NASA-funded study by the National Academy of Sciences, if a similar storm occurred today, it could cause a trillion dollars in damage to society's high-tech infrastructure and require years for complete recovery. The students are selling these white gold-plated pendants to support their cosmic ray ballooning program.