Lunar atmospheric composition experiment LACE Katie Pazamickas LACE

Lunar atmospheric composition experiment (LACE) Katie Pazamickas

LACE �Flew on Apollo 17 as a part of ALSEP. �Deployed in the Taurus. Littrow Valley (30° 45’ 53. 6” E and 20° 11’ 31. 6” N) �Turned on Dec. 27, 1972 at 18: 07

The moon has an atmosphere? �Gas molecules travel in ballistic trajectories between collisions with the lunar surface classic exosphere. �Sources come from solar wind, lunar volcanism or meteoroid impacts. �No dipolar magnetic field, however once every lunar orbit the moon will pass through the Earth’s magnetotail for approximately 6 days.

How LACE Works �Gas molecules enter and are ionized by an electron bombardment ion source, collimated into a beam and sent through a magnetic analyzer to a detection system. � 3 mass ranges scanned simultaneously.

The Riddle �Each record consists of 90 x 16 array of numbers, or 1440 numbers, with only 1330 numbers of actual data. � 1330 steps, with a time between steps of. 6 sec � 10 steps of background and 10 steps of internal calibration are inserted between sweeps �A sweep is 13. 5 min

3. 2 amu 3. 4 amu 10 2. 8 amu 3. 9 amu 100 1 52 103 154 205 256 307 358 409 460 511 562 613 664 715 766 817 868 919 970 1021 1072 1123 1174 1225 1276 1327 1000 1. 2 amu 10000 2. 2 amu MASS AR 1

40. 2 amu 41. 7 amu 42. 5 amu 44. 4 amu 43. 7 amu 100 36. 6 amu 32 amu 18. 7 amu 19. 8 amu 22. 3 amu 21. 6 amu 23. 4 amu 34. 2 amu 45. 4 amu 1000 1 42 83 124 165 206 247 288 329 370 411 452 493 534 575 616 657 698 739 780 821 862 903 944 985 1026 1067 1108 1149 1190 1231 1272 1313 MASS BR 10 1

58. 8 amu 89 amu 100. 4 amu 99 amu 100 1 52 103 154 205 256 307 358 409 460 511 562 613 664 715 766 817 868 919 970 1021 1072 1123 1174 1225 1276 1327 40 amu 1000 34 amu 51. 5 amu MASS CR 10000 10 1

Thank You! �Dr. Dave Williams �Dr. Kent Hills �Dr. Ed Grayzeck �Dr. Mark Adrian �Cori Quirk