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Chandra Radiation Environment Summary

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

Orbit start: 2024:125:13:12:07 (46.2 ksec in this period)
Current altitude/orbit leg: 114759 A (km)
Current configuration: ACIS-S NONE
Next comm: 2024:126:02:29:00 (0.5 hours)
Next rad zone: 2024:127:21:04:00 (43.0 hours)
Last updated: 2024:126:02:02:00

(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: 137.7     Until next comm: 1.7
 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 3.578e+02 3.593e+07 8.521e+07
(1.345e+08)
*5.287e+08*		 3.652e+07 4.618e+07 working yellow limit:
1.000E+09 (fluence)
ACE P3 5.880e+02 2.580e+07 1.068e+08
(1.878e+08)
*8.357e+08*		 2.677e+07 4.265e+07 alert trigger: 1.000E+09 (fluence)
GOES-R (P4) 5.925e-03 2.930e+02 1.109e+03 3.028e+02 4.628e+02  
GOES-R (P7) 2.316e-04 1.697e+01 4.888e+01 1.736e+01 2.361e+01  
GOES-R (E>2.0MeV) 4.114e+01 5.315e+05 6.198e+06 5.995e+05 1.710e+06  
 
 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 3.578e+02 5.368e+07 1.091e+08 5.427e+07 6.393e+07  
ACE P3 5.880e+02 2.550e+07 1.166e+08 2.647e+07 4.235e+07 3.6e8 (2 hr fluence, red)
GOES-R (P4) 5.925e-03 4.377e+02 1.356e+03 4.475e+02 6.075e+02 30.0/90.9 (flux, yellow/red)
GOES-R (P7) 2.316e-04 2.536e+01 6.124e+01 2.574e+01 3.200e+01 0.25/0.70 (flux, yellow/red)
GOES-R (E>2.0MeV) 4.114e+01 7.940e+05 7.167e+06 8.621e+05 1.973e+06  

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 [ 2024:125:20:26:15 (May ], not averaged.

Attenuated CRM Proton Fluence

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