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about_rad_summ.html
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about_rad_summ.html
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<HTML>
<HEAD>
<TITLE>About the Chandra Radiation Environment Summary </TITLE>
</HEAD>
<BODY TEXT="#DDDDDD" BGCOLOR="#000000" LINK="#FF0000" VLINK="#FFFF22"
ALINK="#7500FF">
<center>
<H2>
About the Chandra Radiation Environment Summary
</h2>
</center>
<br>
<br>
See also<br />
<a href="http://cxc.cfa.harvard.edu/acis/reb/OnRadiation.html"> ACIS Ops Response to Radiation Events</a><br />
<a href="http://cxc.harvard.edu/mta/alerts/about_ace_page.html"> About ACE Monitoring</a><br />
<br />
Current orbit start, configuration, and current fluxes/orbital (CRM and Goes) fluences come from /proj/rac/ops/CRM3/CRMsummary.dat<br />
EPHIN rates come from /pool14/chandra/chandra_psi.snapshot<br />
Current unattenuated ACE comes from /proj/rac/ops/ACE/fluace.dat<br />
Current ACE attenuated data comes from /export/acis-flight/FLU-MON/current.dat<br />
<br />
Upcoming spacecraft configuration and radzones come from /proj/sot/ska/data/arc/iFOT_events files.<br />
<br />
We calculate the attenuation factors to be used for GOES calculations from the CRM data:<br />
att_factor= crm_flx_att/crm_flx<br />
att_flu_factor= crm_flu_att/crm_flu<br />
<br />
Future attenuated fluences until the next comm, second comm, and next radzone entry based on the upcoming configuration so that:<br />
<br />
future_attenuated_fluence = current_attenuated_fluence + (curr_unattenuated_flux * future_attenuation_factor)<br />
where<br />
future_attenuation_factor = hrc_time*0 + acis_bare_time*1 + acis_hetg_time*0.2 + acis_letg_time*0.5<br />
<hr />
Last updated: 04/20/11
</body>
</html>