... references.^1.1

See also [Chamberlain, 1995, Appendix VIII], regarding historical references.

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... changes''^1.2

Free translation by the author, see the quote at the beginning of Chapter 3

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... network^1.3

http://www.geo.fmi.fi/MIRACLE/

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... Polar/VIS^1.4

http://eiger.physics.uiowa.edu/~vis/

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... Lux^3.1

According to Holst [1998, p. 28]

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... taper^3.2

In this text, the term ``ICCD'' is used for the combination of an image intensifier and a CCD, regardless of coupling type, or if they are manufactured as one unit or not.

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... photoelectrons^3.3

A more detailed discussion of this noise source is found in works by Holst [1998, pp. 195-200], Trondsen [1998, p. 48], Csorba [1985, pp. 120-124] and Hertel [1989].

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... unit^3.4

Note the cables are only about 1 m and flat on the prototype unit (ccdcam1)

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... equation^3.5

from the filter manufacturer (http://www.barrassociates.com/terms.php?type=angle), see also [Jones, 1974]

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... )^4.1

ftp://adc.gsfc.nasa.gov/pub/adc/archives/catalogs/5/5050

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... exercise^6.1

The problem is not so much the visualisation itself, but rather that human perception has evolved to interpret 2-D surfaces of 3-D objects. Evolution has never required an understanding of a true 3-D distribution.

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... radiology^6.2

Incidentally, the term ``tomography'' existed in radiological applications decades before computerised tomography became a real possibility. See, for example, Lodin [1935]; Weinbren [1946], and other references discussed in Backlund [1956]. Typically a series of X-ray exposures were obtained while the X-ray tube and film-cassette rotated around the patient. Back then, the tomographic inversion had to be performed by the brain of the radiologist observing these series of X-ray images.

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... airglow\xspace^6.3

As long as the enhancements were only observed in the $O(^1D)$ (6300 Ã…) and occasionally in the $O(^1S)$ (5577 Ã…) emission lines, the natural term was ``HF pump-enhanced airglow''. With the recent observations in the $N^+_{2}$ 1Pos. (6600 Ã…) emission [Djuth et al., 1999], and $N^+_{2}$ 1Neg. (4278 Ã…) and $O(3p^3P)$ (8446 Ã…), a more correct term would be something like ``HF pump-enhanced optical emissions'' or maybe ``Radio-induced optical emissions''. However, the old term ``HF pump-enhanced airglow'' will be retained in this text for compatibility with earlier papers.

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... ten^A.1

Two additional structures have been built for other users

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