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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 (208.2 ksec in this period)
Current altitude/orbit leg: 71400 D (km)
Current configuration: HRC-S HETG
Next comm: 2024:128:00:44:00 (1.7 hours)
Next rad zone: 2024:130:13:06:00 (62.1 hours)
Last updated: 2024:127:23:02:00

(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: 174.4     Until next comm: 0.0
 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 0.000e+00 1.694e+08 1.694e+08
(1.694e+08)
*1.694e+08*		 1.694e+08 1.694e+08 working yellow limit:
1.000E+09 (fluence)
ACE P3 0.000e+00 5.480e+07 5.480e+07
(5.480e+07)
*5.480e+07*		 5.480e+07 5.480e+07 alert trigger: 1.000E+09 (fluence)
GOES-R (P4) 0.000e+00 3.677e+02 3.677e+02 3.677e+02 3.677e+02  
GOES-R (P7) 0.000e+00 2.172e+01 2.172e+01 2.172e+01 2.172e+01  
GOES-R (E>2.0MeV) 0.000e+00 6.919e+05 6.919e+05 6.919e+05 6.919e+05  
 
 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 2.144e+03 8.848e+08 1.364e+09 8.980e+08 9.726e+08  
ACE P3 1.250e+01 3.750e+08 3.778e+08 3.751e+08 3.755e+08 3.6e8 (2 hr fluence, red)
GOES-R (P4) 1.188e-02 1.921e+03 4.575e+03 1.994e+03 2.408e+03 30.0/90.9 (flux, yellow/red)
GOES-R (P7) 2.315e-04 1.135e+02 1.652e+02 1.149e+02 1.230e+02 0.25/0.70 (flux, yellow/red)
GOES-R (E>2.0MeV) 1.163e+01 3.615e+06 6.213e+06 3.687e+06 4.091e+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 [ 2024:127:10:41:09 (May ], not averaged.

Attenuated CRM Proton Fluence

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