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Chandra Radiation Environment Summary

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

Orbit start: 2024:138:18:34:03 (220.7 ksec in this period)
Current altitude/orbit leg: 37841 D (km)
Current configuration: HRC-S HETG
Next comm: 2024:141:10:14:00 (2.4 hours)
Next rad zone: 2024:143:17:52:00 (58.0 hours)
Last updated: 2024:141:07:52:00

(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: 189.0     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 1.231e+09 1.231e+09
(1.231e+09)
*1.231e+09*		 1.231e+09 1.231e+09 working yellow limit:
1.000E+09 (fluence)
ACE P3 0.000e+00 9.200e+08 9.200e+08
(9.200e+08)
*9.200e+08*		 9.200e+08 9.200e+08 alert trigger: 1.000E+09 (fluence)
GOES-R (P4) 0.000e+00 5.069e+04 5.069e+04 5.069e+04 5.069e+04  
GOES-R (P7) 0.000e+00 1.158e+02 1.158e+02 1.158e+02 1.158e+02  
GOES-R (E>2.0MeV) 0.000e+00 1.154e+07 1.154e+07 1.154e+07 1.154e+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 5.600e+02 1.508e+09 1.625e+09 1.513e+09 1.533e+09  
ACE P3 1.120e+03 0.000e+00 2.339e+08 9.603e+06 4.992e+07 3.6e8 (2 hr fluence, red)
GOES-R (P4) 1.648e-01 6.209e+04 9.651e+04 6.350e+04 6.944e+04 30.0/90.9 (flux, yellow/red)
GOES-R (P7) 6.950e-04 1.419e+02 2.870e+02 1.479e+02 1.729e+02 0.25/0.70 (flux, yellow/red)
GOES-R (E>2.0MeV) 9.384e+01 1.414e+07 3.374e+07 1.494e+07 1.832e+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 [ 2024:141:03:27:37 (May20) ], not averaged.

Attenuated CRM Proton Fluence

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