Chandra Radiation Environment Summary

See about rad_summ for the definition and origin of the values below.

Orbit start: 2022:144:05:54:01 (all times on this page are UTC)
Current altitude (km) and orbit leg: 147659 D
Current configuration: ACIS-I NONE
Next comm: 2022:146:2:30:00 ( 6.5 hours)
Next rad zone: 2022:146:16:08:00 (20.1 hours)
Last updated: Wed May 25 20:02:08 2022

 Attenuated - projects fluences based on upcoming SI and grating configuration
ACIS effective exposure times (ks)     Until next radzone: 72.0     Until next comm: 23.3
 Current FluxCurrent fluence
(total so far in current orbit)
Projected fluence
until next rad zone
Projected fluenceProjected fluenceLimits
 (p/cm^2-s-sr-MeV)(p/cm^2-sr-MeV)at current flux
(at 2X flux)
*at 10X flux*
until next comm.until second comm. 
CRM 2.499E+02 1.135E+07 2.934E+07
1.717E+07 2.541E+07 working yellow limit:
1.000E+09 (fluence)
ACE P3 1.600E+01 2.370E+06 3.666E+06
2.789E+06 3.383E+06 alert trigger:
1.000E+09 (fluence)
GOES-R (P4) 3.900E-02 1.608E+03 4.416E+03 2.516E+03 3.803E+03  
GOES-R (P7) 1.300E-02 5.360E+02 1.472E+03 8.386E+02 1.268E+03  
GOES-R (E > 2.0 MeV) 3.020E+02 1.245E+07 3.419E+07 1.948E+07 2.945E+07  
 External - does not take into account the instrument configuration
 Current FluxCurrent fluence
(total so far in current orbit)
Projected fluenceProjected fluence Limits
 (p/cm^2-s-sr-MeV)(p/cm^2-sr-MeV)until next radzone
(total for current orbit)
until next comm.until second comm. 
CRM 2.499E+02 3.780E+07 5.588E+07 4.361E+07 5.186E+07  
ACE P3 1.870E+01 2.746E+06 4.099E+06 3.181E+06 3.798E+06 3.6e8 (2 hr fluence, red)
GOES-R (P4) 3.900E-02 5.354E+03 8.176E+03 6.262E+03 7.549E+03 30.0/90.9 (flux, yellow/red)
GOES-R (P7) 1.300E-02 1.785E+03 2.725E+03 2.087E+03 2.516E+03 0.25/0.70 (flux, yellow/red)
GOES-R (E > 2.0 MeV) 3.020E+02 4.146E+07 6.331E+07 4.849E+07 5.845E+07  

The current fluence is calculated from the beginning on the current orbit. The ACE P3 external fluence starts integrating above 10 kkm.
* EPHIN "fluxes" are raw counts as of the last support [ 2022:145:20:01:27 May25 ], not averaged.