[Aavso-photometry] average vs. median

[Wolfgang Renz]

Ben, if you want to know something more on cosmics
amd radioactivity and their effects you can read:

Roper Scientific - Cosmic Rays
http://www.roperscientific.de/tcosmic.html

Radioactive Glass in Lenses
Are Your Lenses Really "Hot"?!! 
by Robert Monaghan
http://medfmt.8k.com/mf/radioactive.html

Cosmic Ray Events and Natural Radioactivity in CCD Cryostats
Florentin-Nielsen, Ralph; Andersen, Michael J.; Nielsen, Sven P.
http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=1995IAUS..167..207F

Cosmic Rays and Other Nonsense in Astronomical CCD Imagers
Don Groom
http://snap.lbl.gov/ccdweb/groom.pdf

SPIE 4669, 172-183 (2002) (Electronic Imaging 2002) 23 Jan 2002 LBNL-49316
Radiation events in astronomical CCD images
A. R. Smith, R. J. McDonald, D. L. Hurley, S. E. Holland, and D. E. Groom
W. E. Brown, D. K. Gilmore, R. J. Stover, and M. Wei
http://snap.lbl.gov/ccdweb/ccdradLBNL_spie02.pdf

(UNWANTED) RADIATION EVENTS IN ASTRONOMICAL CCD IMAGES
Don Groom (Presented for Al Smith et al.)
Lawrence Berkeley National Laboratory
http://snap.lbl.gov/ccdweb/ccdrad_talk_spie02.pdf

Clear skies
  Wolfgang

-- 
Wolfgang Renz, Karlsruhe, Germany
Rz.BAV = WRe.vsnet = RWG.AAVSO



----- Original Message ----- 
From: "Ben Davies" <ben at davies.net>
To: <aavso-photometry at mira.aavso.org>
Sent: Friday, January 20, 2006 9:02 PM
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