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Chandra Radiation Environment Summary

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

Orbit start: 2024:112:07:59:03 (195.8 ksec in this period)
Current altitude/orbit leg: 95060 D (km)
Current configuration: ACIS-I NONE
Next comm: 2024:114:17:49:00 (3.5 hours)
Next rad zone: 2024:114:16:06:00 (1.7 hours)
Last updated: 2024:114:14:22:00

(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: 6.3     Until next comm: 12.5
 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 5.598e+02 5.418e+07 5.768e+07
(6.118e+07)
*8.921e+07*
6.116e+07 6.138e+07 working yellow limit:
1.000E+09 (fluence)
ACE P3 3.060e+01 3.590e+06 3.781e+06
(3.973e+06)
*5.505e+06*
3.972e+06 3.984e+06 alert trigger: 1.000E+09 (fluence)
GOES-R (P4) 1.785e-02 7.451e+02 8.568e+02 9.678e+02 9.748e+02  
GOES-R (P7) 9.285e-04 4.167e+01 4.748e+01 5.326e+01 5.362e+01  
GOES-R (E>2.0MeV) 6.215e+02 1.543e+07 1.932e+07 2.318e+07 2.342e+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 5.598e+02 1.374e+08 1.409e+08 1.444e+08 1.614e+08  
ACE P3 3.060e+01 4.430e+06 4.621e+06 4.812e+06 5.739e+06 3.6e8 (2 hr fluence, red)
GOES-R (P4) 1.785e-02 1.890e+03 2.002e+03 2.113e+03 2.654e+03 30.0/90.9 (flux, yellow/red)
GOES-R (P7) 9.285e-04 1.057e+02 1.115e+02 1.173e+02 1.454e+02 0.25/0.70 (flux, yellow/red)
GOES-R (E>2.0MeV) 6.215e+02 3.913e+07 4.302e+07 4.688e+07 6.572e+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 [ 2024:114:12:50:40 (Apr23) ], not averaged.

Attenuated CRM Proton Fluence

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