Estimations of subsurface structures and dielectric properties of lunar mare regions from Lunar Radar Sounder (LRS) Observations

1
Estimations of subsurface structures and
dielectric properties of lunar mare regions from
Lunar Radar Sounder (LRS) Observations
??????????(LRS)??????????????????????
???1,????2,????3,????2

• 1????????????????????
• 2???????????????????
• 3??????????????????????????

2
1. Introduction
highland
??????

• ????(highland)?????????????????????????????
• ???(mare)???????????????

Fig. 1 ???
mare
???????????????????????????
?????? ??????(??????????)??????????????? ????????
?
??????????????????????????????????
???????????????????????
3
1. Introduction
??????

• ?????????????????????????????????????????
• ??????????(???????????)?????????????????????????
  ?????????????????????????
• ????????????????????????SELENE??????????????????
  ????????

4
2. ????????
??????????
????????????????????????????????? ??????? 75 m
???? 80 m
Fig. 2 ??????????
(1)
L????? ?t????????? C?? e??????
?????? (Apparent depth)
5
Fig. 2 1??????????
???(clutter echo)??????????????????????
????????
Fig. 3 ??????????????
6
2. ????????
????? (Clutter echo)
???????????????????????????????
Fig. 4 ????????
?????????10???????????(data stucking)????????????
?????
Fig. 5 ???????
6
7
2. ????????
Fig. 6 1??????????

• ??????
• ?????????????1????????????????

8
Fig. 7 ??????????????
9
2. ????????
?????????????
Surface echo??????????? Subsurface
echo????????????????? ????????????????????
Fig. 8 ????????????????
Surface echo
Subsurface echo or Clutter echo
Fig. 9 Fig.7?????????????
10
3. ??????
???????????
Apollo17???????????..Apollo Lunar Sounder
Experiment (ALSE) ??1?2 km????????????(???????8.
7???) (Phillips et al.,1978)
???????????????????
Fig. 10 Laser Altimater????????
Fig. 11 ALSE???????(Phillips et al.,1978)
11
3. ??????
Fig.12 ?????????
Fig. 13 ?????????
Fig. 14 ?????????
12
3. ??????

• ????100 m(???8.7???)?ALSE???????1200 m ..400
  m?????????
• ALSE????????????(??1?2 km??)???????????????

Fig. 15 ??????????
13
4. ??????????????
2?????????
????2??????????(2????)???
(2) Ono et al., 2000
Fig. 16 2????????
14
4. ??????????????
?(2)??????????????(L.T.)?????

• L.T. 0.001,0.003,0.005???
• 1lte1lt10,1lte2lt10?????P2/P1-f(e1,e2)??????(e1,e2)???
  ????

(2)
????????????e1,e2??????????????????
????20.9?24.4E17.5? 25.0N(??????)
15
Fig. 17 ????????
Fig. 18 ????????
16
5. Conclusion
Conclusion

• ????(5?30E15?40N)??????????300
  m??????????????????
• ??????????????????????????????????????????????

Fig. 19 2???????????
17
Acknowledgement
???????LALT???????????LALT????????????????????????
???????????
18
6. Appendix
Apollo1117???????????loss tangent????(Olhoeft et
al.,1974)
loss tangent ???????(FeOTiO2)????? ??????????????
?0.005?????
CFeOTi02???() ???
Fig. 20 loss tangent???
?????????
19
6. Appendix
?????????????? ???????????????2.5????9.5
??????? (Olhoeft et al.,1974)
????????????????????????? ??????????????????????
????????????
Fig. 21 ?????
p?????
20
6. Appendix
????(Margot et al,. 1996)??????????? ??30-70???-
10-42?????????????(??21 cm?)???
???(??)???????? ??????????? ??????? ????
Fig. 22 ?????
21
6. Appendix
????L.T.lt0.005 ? ???????5 km??????????????
Fig. 23 ??????????? Ono et al., 2000