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From: all@imperial.ac.uk
Subject: high radiation monitoring
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Date: Wed, 15 Sep 2004 16:38:44 GMT
From: all@imperial.ac.uk
To: xmmhelp@xmm.vilspa.esa.es
CC: all@imperial.ac.uk
Subject: high radiation monitoring
Full_Name: Anna Lia Longinotti
Submission from: (NULL) (155.198.204.87)


Dear helpdesk, 
I'm working on several xmm observations and I found 2 of them 
with a background level twice higher than normal, 
even after cleaning the soft protons flares.

I checked with the observation log browser 
if any of them was flagged as "affected by high radiation" 
since I can't explain such a level of background, but 
none of them is.
I noticed that these two observations happen 
to be performed consecutively  in the same revolution (0279) and that the last
exposure of the previous revolution 0278 is "affected by high radiation".
My suspect therefore is that my objects were observed with a high 
radiation level, but not as such to be specified in the obs. log
comments. 
 
Is there a way to have some information or monitor the radiation level 
of revolutions performed before the 0800 (which is the number
available on your radiation monitoring archive) ? 

Many thanks,
regards 
                      Anna Lia Longinotti


Reply 1

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From: Matthias Ehle <xmmhelp@xmm.vilspa.esa.es>
To: all@imperial.ac.uk
Subject: Re: high radiation monitoring (PR#16209)
Date: Thu Sep 16 12:02:26 2004
Dear Anna Lia Longinotti,

we guess that you refer to the two PG observations (PI A.Fabian) in rev 279,
the 3rd and 4th observations in the revolution. From the radiation plots
(I will send them from my private account as the helpdesk mail system does not
allow us to attach files) (MOS third from the top and pn at the bottom),
one can see that indeed the level of soft-proton activity was rather unstable,
but not that bad actually once the GTI filtering is done we think. There are
much worse cases, for instance the last observation of this revolution.

The indications of radiation reported in the OLB refer to the Radiation Monitor
(protons of much higher energy), which are very poorly correlated with the
quality
of EPIC exposures. There was indeed a surge in rev 278 (cf top plot, Radmon
counts), from a small CME (Coronal Mass Ejection), that didn't reach levels
where science observation would be aborted (500). By the second half of
rev 279, the level was back to quiet level, but then some soft-proton clouds
came through the XMM-Newton orbit ...

Cheers,
        Matthias

        Matthias Ehle 
        XMM-Newton User Support Group

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