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Chandra Radiation Environment Summary

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

Orbit start: 2024:347:16:14:03 (94.1 ksec in this period)
Current altitude/orbit leg: 148087 A (km)
Current configuration: ACIS-S NONE
Next comm: 2024:349:00:09:00 (5.8 hours)
Next rad zone: 2024:349:23:56:00 (29.6 hours)
Last updated: 2024:348:18:22:00

(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: 71.3     Until next comm: 9.4
 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 1.870e+01 2.052e+07 2.185e+07
(2.319e+07)
*3.386e+07*		 2.070e+07 2.151e+07 working yellow limit:
1.000E+09 (fluence)
ACE P3 2.040e+01 1.260e+06 2.715e+06
(4.170e+06)
*1.581e+07*		 1.452e+06 2.343e+06 alert trigger: 1.000E+09 (fluence)
GOES-R (P4) 5.967e-03 4.748e+02 9.004e+02 5.311e+02 7.916e+02  
GOES-R (P7) 2.324e-04 2.298e+01 3.956e+01 2.518e+01 3.532e+01  
GOES-R (E>2.0MeV) 3.695e+02 1.930e+07 4.565e+07 2.278e+07 3.891e+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 1.870e+01 3.919e+07 4.118e+07 3.958e+07 4.059e+07  
ACE P3 2.040e+01 1.420e+06 3.592e+06 1.846e+06 2.947e+06 3.6e8 (2 hr fluence, red)
GOES-R (P4) 5.967e-03 9.069e+02 1.542e+03 1.031e+03 1.354e+03 30.0/90.9 (flux, yellow/red)
GOES-R (P7) 2.324e-04 4.390e+01 6.864e+01 4.875e+01 6.130e+01 0.25/0.70 (flux, yellow/red)
GOES-R (E>2.0MeV) 3.695e+02 3.686e+07 7.619e+07 4.457e+07 6.453e+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 [ 2024:348:17:35:22 (Dec13) ], not averaged.

Attenuated CRM Proton Fluence

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