List of Figures

1. First proposed layout of ALIS
2. Proposed layout of Swe-ALIS
3. Fields-of-view and station baseline
4. Map of the present ALIS
5. The NIPU
6. The ALIS Control Centre
7. Block-diagram of the ALIS Control Centre
8. The ALIS Operations Centre
9. Quantum efficiency vs. wavelength for the SI-003AB CCD
10. $\mathit{SNR}$ vs. column emission
11. $\mathit{SNR}$ vs. integration time
12. The effect of on-chip binning
13. Dividing a full-frame CCD into sub-arrays.
14. The six ALIS imagers
15. Schematic diagram of the optical system
16. The six-position filter wheel
17. Electronics for the filter wheel and CPS
18. The Camera Positioning System
19. ALIS preset camera positions projected to 110 km altitude
20. Block diagram of ALIS imager subsystems
21. Coordinates and notation for the CCD in the ALIS Imager
22. Calibration sources used for ALIS calibration
23. Column emission rates for the calibrators
24. Example filter transmittance curve
25. Typical ALIS background image
26. Block diagram of OPERA
27. Station software
28. An example of the difficulties of auroral image classification.
29. Geometry of the HF pump-enhanced airglow experiments
30. Maximum and average column emission time series as seen from four stations
31. Sequence of airglow images from the Silkkimuotka ALIS station
32. A series of images of enhanced 6300 Å airglow
33. Results of triangulation of the maximum volume emission.
34. Triangulation of the displacement of the two peaks in Figure 6.4
35. Fabry-Perot interferometer measurements of the neutral wind at 240 km altitude.
36. EISCAT UHF radar measurements of electron density
37. Volume rendering of the artificially-enhanced airglow region above Tromsø
38. Estimates of the $O(^1D)$ excitation rates
39. Estimated electron flux
40. Estimated electron flux
41. Auroral images from 16 February 1997
42. Daytime auroral image
43. PSC images and altitude profiles
44. ALIS images of a meteor trail
45. Projected meteor altitude profile
46. Meteoroid altitude profiles
47. Block diagram of the GLIP
48. Transmittance curves for plexi-glass
49. The GLIP in Tjautjas
50. Detail of the GLIP dome
51. Electrical installation of a GLIP
52. Rear view of the Power Distribution Unit
53. The Housekeeping Unit
54. GPS-receiver
55. The mobile imaging platform
56. A digital colour all-sky camera
57. Sample auroral image from the all-sky camera prototype
58. Colour video frame of aurora with a meteor trail
59. Block diagram of the upgraded GLIP
60. Block diagram of future GLIPs
61. A decentralised future ALIS