From epp@star.arm.ac.uk Tue Nov 18 16:42:53 2003
Date: Wed, 05 Aug 1998 18:13:15 +0100
From: Elena Perez <epp@star.arm.ac.uk>
Reply-To: sumer-soft@esa.nascom.nasa.gov
To: sumer-soft@esa.nascom.nasa.gov
Subject: SUMER-SOFT: SUMER statistics


Hello,

I'm trying to calculate errors from SUMER data, and I wonder whether anyone
can help me. I've been looking at the SUMER www page and Wilhelm et al.,97,
but it's not obvious to me what the sources of potential error are. In CDS
(NIS) data photon statistics, detector noise (readout noise + bias) and pixel
cross-talk are important. (see CDS Software Note No. 49)
What kind of errors have to be considered for SUMER? 

>From Wilhelm et al.'97 I understood that background noise and bias errors 
were very small, almost negligible. Is this right? I haven't found anything 
about readout noise... On the other hand, in the photon statistics for CDS
what is called "the pulse height distribution" (PHD) is important.
Is this also important for SUMER?

Thanks in advance for any help.

Regards,

Elena Perez