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Chandra Radiation Environment Summary

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

Orbit start: 2024:114:23:27:06 (200.1 ksec in this period)
Current altitude/orbit leg: 87383 D (km)
Current configuration: ACIS-I NONE
Next comm: 2024:117:22:49:00 (15.8 hours)
Next rad zone: 2024:117:08:14:00 (1.2 hours)
Last updated: 2024:117:07:02:00

(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: 4.0     Until next comm: 17.7
 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 1.730e+04 1.051e+08 1.739e+08
(2.427e+08)
*7.931e+08*		 4.120e+08 -1.102e+08 working yellow limit:
1.000E+09 (fluence)
ACE P3 2.140e+02 4.010e+07 4.095e+07
(4.180e+07)
*4.861e+07*		 4.390e+07 3.744e+07 alert trigger: 1.000E+09 (fluence)
GOES-R (P4) 0.000e+00 1.626e+03 1.626e+03 1.626e+03 1.626e+03  
GOES-R (P7) 6.945e-04 8.497e+01 8.774e+01 9.730e+01 7.633e+01  
GOES-R (E>2.0MeV) 2.887e+01 9.658e+07 9.669e+07 9.709e+07 9.622e+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 1.730e+04 1.295e+08 2.042e+08 1.113e+09 -8.579e+07  
ACE P3 2.140e+02 4.250e+07 4.342e+07 5.467e+07 3.984e+07 3.6e8 (2 hr fluence, red)
GOES-R (P4) 0.000e+00 2.004e+03 2.004e+03 2.004e+03 2.004e+03 30.0/90.9 (flux, yellow/red)
GOES-R (P7) 6.945e-04 1.047e+02 1.077e+02 1.442e+02 9.605e+01 0.25/0.70 (flux, yellow/red)
GOES-R (E>2.0MeV) 2.887e+01 1.190e+08 1.191e+08 1.206e+08 1.186e+08  

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 [ 2024:117:06:13:00 (Apr26) ], not averaged.

Attenuated CRM Proton Fluence

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