Evaluation of the New Trapped Proton Model (AP9) at ISS Attitudes. Francis F. Badavi. (NASA Langley Radiation Team)

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1 Evaluation of the New Trapped Proton Model () at ISS Attitudes Francis F. Badavi (NASA Langley Radiation Team) Old Dominion University, Norfolk, VA 359, USA WRMISS8, 3-5 September 3, Budapest, Hungary

2 Background I Traditionally, trapped exposure estimates for the tissue/ssd based components are computed using NASA trapped models /AE8. These trapped models were developed in the 97s and 98s. II /AE8 are static models. Don t provide probability distribution or error bars. Don t include broad energy range (i.e., hot plasma / energetic protons) and don t include complete spatial coverage for LEO, MEO, GEO, GTO and HEO missions. III Aerospace Corporation, Los Alamos National Laboratory (LANL), National Reconnaissance Office (NRO) and Air Force Research Laboratory (AFRL), embarked on producing /AE9. IV /AE9 offer improvements in spectral and spatial coverage definition, epoch correlated probability distribution, statistical accuracy and uncertainty quantification.

3 Outline I Solar indices and the particular epoch I chose for analysis. II Show the deficiencies of and the improvements that offers. III Talk about the specific Liulin data and / proton boundary conditions that I am using. IV For one day ISS orbit (44 minutes), I will shows dosemetric correlation among, environments and Liulin data for 6 SAA passes. V Summary and future work. *** No further discussion of AE9***

4 ISS South Atlantic Anomaly (SAA) Pass

5 Solar Indices 7/7/ 6// SSN F.7 phi OuluNM year 6 9

6 SSN Solar Index 7/7/ 6// 8 6 SSN SSN year

7 min-max vs. min max 7/7/ 6// SSN SSN year

8 Modulation of the Trapped Protons in LEO 3 75 F.7 solar radio flux ( - W-m - -Hz - ) Epoch (year) Neutron counts (DRNM, normalized Oulu and projection) f p (r,θ,φ,e,t) = f p,min (r,θ,φ,e) exp{-α p [NM F.7 - NM F.7 MIN ]} α p = {log [f p,min (r,θ,φ,e) / f p,max (r,θ,φ,e) ]/[NM F.7 Max - NM F.7 MIN ] Badavi (6)

9 Errors in /AE8 Courtesy /AE9 documents

10 /AE9 Data Sets Temporal Coverage Combined Release and Radiation Effects Satellite (CRRES) Surface Charging at high altitudes (SCATHA) Courtesy /AE9 documents

11 Liulin -4 Data Sets (7/7/) 5x6x4=36 transport runs Liulin data courtesy of T. Dachev

12 / Comparison (Ascending Nodes, 7/7/) max max max Pass Pass Pass3 3

13 / Comparison (Descending Nodes, 7/7/) max max max Pass4 Pass5 Pass6

14 / Dosemetric Comparison (Ascending Node, Pass).5 MDU.5 MDU MDU3.5 MDU Liulin data courtesy of T. Dachev

15 / Dosemetric Comparison (Ascending Node, Pass).5 MDU.5 MDU MDU3.5 MDU Liulin data courtesy of T. Dachev

16 / Dosemetric Comparison (Ascending Node, Pass) MDU MDU MDU MDU Liulin data courtesy of T. Dachev

17 / Dosemetric Comparison (Ascending Node, Pass) MDU MDU MDU MDU Liulin data courtesy of T. Dachev

18 / Dosemetric Comparison (Ascending Node, Pass3).8 MDU.8 MDU MDU MDU Liulin data courtesy of T. Dachev

19 / Dosemetric Comparison (Ascending Node, Pass3).8 MDU.8 MDU MDU MDU Liulin data courtesy of T. Dachev

20 / Dosemetric Comparison (Descending Node, Pass4).8 MDU.8 MDU MDU MDU Liulin data courtesy of T. Dachev

21 / Dosemetric Comparison (Descending Node, Pass4).8 MDU.8 MDU MDU MDU Liulin data courtesy of T. Dachev

22 / Dosemetric Comparison (Descending Node, Pass5) 3.5 MDU MDU MDU MDU Liulin data courtesy of T. Dachev

23 / Dosemetric Comparison (Descending Node, Pass5) 3.5 MDU MDU MDU MDU Liulin data courtesy of T. Dachev

24 / Dosemetric Comparison (Descending Node, Pass6).5 MDU.5 MDU MDU MDU Liulin data courtesy of T. Dachev

25 / Dosemetric Comparison (Descending Node, Pass6).5 MDU.5 MDU MDU MDU Liulin data courtesy of T. Dachev

26 Summary and Future Work I Deficiencies and limitations of was discussed and capabilities was introduced. II The differences in proton boundary conditions for 6 SAA was discussed. III Validations results among, and Liulin data was discussed. In /4 validation cases, correlated fairly well with measurement. In /4 cases, validation was marginal. IV So far, the validation process is strictly manual. Work is underway to automate the validation process. V Next step is to perform validation for the ISS ULF7 configuration. This will depend on the availability of CAD/mass model of ISS for this epoch. (ULF7 3R in 4) VI Limited 3D measurements are currently available. It is very desirable to validate 3D data (TRITEL, etc ) with simulation.

27 Backups

29 SAA Ascending Descending Nodes Differences flux > MeV (cm - s - ) at 4 km max Badavi (6)

30 SAA Ascending Descending Nodes Differences flux > MeV (cm - s - ) at 4 km max Badavi (6)

31 SAA Ascending Descending Nodes Differences 5.6 max min Badavi (6)

32 /AE9 Data Sets Spectral (Energy) Coverage Combined Release and Radiation Effects Satellite (CRRES) Surface Charging at high altitudes (SCATHA) Courtesy /AE9 documents

33 Errors in /AE8 Courtesy /AE9 documents

34 ISS-6A Liulin / TEPC Dosimeter Data Format Liulin dosimeters at 4 different locations in lab. module. Present data analysis includes all 4 datasets (MDU - MDU4). Liulin (MDU- MDU4) data were recorded at 3-s. intervals. Data for each of 4 instruments consisted of 66XX records (~4 hrs.) with no gaps. TEPC dosimeter at one location in service module. TEPC data were recorded at 6-s. intervals. Data for TEPC consisted of 833 records (38.5 hr) with 65 min. of gaps. Liulin / TEPC data included orbital parameters as well as dose rates. Measurements were for July 7-3, (near solarmax, GCR???).

II ISS-6A Liulin Dosimeter Data Format Dose = +.857 N ( n ) Cn Flux =.3 C N n MDU: 6633 records t =-.5 min.

35 II ISS-6A Liulin Dosimeter Data Format Dose = N ( n ) Cn Flux =.3 C N n MDU: 6633 records t =-.5 min. MDU: 6686 records t =-. min. MDU3: 665 records t =-.5 min. MDU4: 663 records t =-.5 min. Time sync: 99.8E, correspond to 6 Jul :6: Z (GMT)

36 Description of Liulin Locations -3/5/ mix 3/5/- 6/6/ mix 7-4/6/ XPOP 5-5/6/ mix 6/6/- 5/7/ +XVV 6-3/7/ +XVV 4-5/7/ +XVV MDU# MDU# MDU#3 MDU#4 Dloc Dloc 3 Dloc 4 Dloc 7 Dloc 5 Dloc 6 Dloc 9 Dloc Dloc 3 Dloc 4 Dloc 8 Dloc 9 Dloc 5 Dloc 6 Dloc Dloc Dloc Dloc 3 Dloc 4 Dloc Dloc 3 Dloc 4 Dloc 7 Dloc 8 Dloc Dloc Dloc 3 Dloc 4 X-Axis Perpendicular to Orbit Plane (XPOP) X-Axis along Velocity Vector (XVV)

37 ISS 6A-Configuration with Liulin Dosimeters (6-3 July )

38 IV CDF for MDU - MDU4 and TEPC (6-3 July )

39 Solar Indices SSN F.7 phi OuluNM year 6 9

40 III ISS-6A Flight Trajectory Data (six DOF) Ref. Borislav T. Tomov (STIL)

41 II ISS 6A Liulin MDU-MDU4 Location/Orientation (6-3 July ) Liulin detector CAD model (MDU MDU4)

42 III Basic Proton Field Distributions (with drifting latitude and longitude) 5 Solid: MIN 965 map Dashed: MAX 97 map Longitude, W Time, yr. 35 Latitude, S Time, yr.

43 Liulin -4 Data Sets (7/7/) x5=9 transport runs MDU MDU MDU3 MDU Liulin data courtesy of T. Dachev

A Predictive Code for ISS Radiation Mission Planning

A Predictive Code for ISS Radiation Mission Planning S. El-Jaby, B.J. Lewis Royal Military College of Canada L. Tomi Canadian Space Agency N. Zapp, K. Lee Space Radiation Analysis Group (NASA) 15 th WRMISS