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The site https://spaceweather.com/ has a section called Space Weather Balloon Data which shows the image below and says:

The data points in the graph above correspond to the peak of the Regener-Pfotzer maximum, which lies about 67,000 feet above central California.

The data points in the graph above correspond to the peak of the Regener-Pfotzer maximum, which lies about 67,000 feet above central California

Questions:

  1. What is the Regener-Pfotzer maximum?
  2. Why does it occur at 67,000 feet above central California?

I have heard of the South Atlantic Anomaly and the Equatorial Anomaly but is there really a radiation anomaly over central California?

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    $\begingroup$ I don't believe this is a localized phenomenon, it is just referring to data collected at that site A paper here discussed the discovery of this threshold. $\endgroup$ – user2448131 Aug 17 '20 at 1:09
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    $\begingroup$ Pop-science: spaceweatherarchive.com/2018/06/07/… and arxiv.org/pdf/1707.00275.pdf. Don't have time right now to read and understand, but maybe it helps somebody else :-) $\endgroup$ – user20217 Aug 17 '20 at 8:55
  • $\begingroup$ @a_donda thanks! $\endgroup$ – uhoh Aug 17 '20 at 10:53
  • $\begingroup$ @Jean-MariePrival thank you! I'd left a space but the paste didn't take. It's there now. $\endgroup$ – uhoh Aug 17 '20 at 10:54
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    $\begingroup$ Knowing nothing of the topic, I could imagine that it potentially a poorly written sentence intended to indicate that the maximum is at 67,000 feet, not that the maximum is above California (instead to say that the data is collected there). Interesting question, will be interested to hear more. $\endgroup$ – JeopardyTempest Feb 27 at 8:07

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