[Aavso-photometry] average vs. median

[Peter Nelson]

Ben,

Cosmic rays are mostly high energy charged particles.  Particles range from
Hydrogen to Uranium, but there are also present (in small numbers) electrons
and sub atomic particles.  About 89% are hydrogen and 10% helium.  Because
of interaction with magnetic fields, their directions have been randomized.
There are galactic cosmic rays (from the galaxy and beyond), anomalous
cosmic rays (outer region of the heliosphere) and solar.

Cheers
Peter

> -----Original Message-----
> From: aavso-photometry-bounces at mira.aavso.org [mailto:aavso-photometry-
> bounces at mira.aavso.org] On Behalf Of Ben Davies
> Sent: Saturday, 21 January 2006 07:02
> To: aavso-photometry at mira.aavso.org
> Subject: Re: [Aavso-photometry] average vs. median
> 
> What exactly are cosmic rays anyway?   I put a thin lead sheet over my
> ccd and they seem to zip right through it.  So they must not be alpha
> particles.  And I would think that x and gamma rays are too far blueward
> to be detected. What's left?
> 
> And whatever they are, are they always going to leave bright, obvious
> tracks, or are many going to go unnoticed on visual inspection?
> 
> Ben Davies
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