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Chandra Radiation Environment Summary

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

Orbit start: 2022:334:15:22:05 (78.0 ksec in this period)
Current altitude/orbit leg: 143168 A (km)
Current configuration: ACIS-S NONE
Next comm: 2022:335:20:24:00 (7.4 hours)
Next rad zone: 2022:337:01:22:00 (36.3 hours)
Last updated: 2022:335:13:02:00

(all times on this page are UTC)

 Attenuated - projects fluences based on upcoming SI and grating configuration
ACIS effective exposure times (ks)     Until next radzone: 130.5     Until next comm: 26.6
 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 5.010e+01 2.157e+07 2.810e+07
2.290e+07 2.399e+07 working yellow limit:
1.000E+09 (fluence)
ACE P3 5.010e+01 1.370e+07 2.024e+07
1.503e+07 1.613e+07 alert trigger: 1.000E+09 (fluence)
GOES-R (P4) 1.185e-02 1.773e+02 1.724e+03 4.920e+02 7.516e+02  
GOES-R (P7) 1.050e-03 1.640e+01 1.534e+02 4.429e+01 6.728e+01  
GOES-R (E>2.0MeV) 2.805e+02 3.436e+06 4.004e+07 1.089e+07 1.703e+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 5.010e+01 1.267e+08 1.333e+08 1.281e+08 1.292e+08  
ACE P3 5.010e+01 2.840e+07 3.495e+07 2.973e+07 3.083e+07 3.6e8 (2 hr fluence, red)
GOES-R (P4) 1.185e-02 1.042e+03 2.592e+03 1.357e+03 1.616e+03 30.0/90.9 (flux, yellow/red)
GOES-R (P7) 1.050e-03 9.637e+01 2.337e+02 1.243e+02 1.473e+02 0.25/0.70 (flux, yellow/red)
GOES-R (E>2.0MeV) 2.805e+02 2.019e+07 5.689e+07 2.764e+07 3.378e+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 [ 2022:335:12:35:10 (Dec ], not averaged.

Attenuated CRM Proton Fluence

Green liness indicates fluence estimates based on the current KP value.