Some auroral properties from far ultraviolet observations |
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| Authors: | L Monchick MJ Linevsky CI Meng S Favin S Chakrabarti F Paresce |
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| Institution: | The Johns Hopkins University, Applied Physics Laboratory, Johns Hopkins Road, Laurel, MD 20707, U.S.A.;Space Sciences Laboratory, University of California, Berkeley, CA 94720, U.S.A. |
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| Abstract: | Recent far ultraviolet spectra of four nightside auroras observed with the extreme ultraviolet (e.u.v.) spectrometer abroad the STP 78?1 satellite (Bowyer et al., 1981) are discussed in terms of two secondary electron flux distribution models. One of these is based on calculations published by Rees and Maeda (1973) and the other on electron flux observations. Using the 1084 Å NII line as the norm, the relative intensities of several lines in the range 900–1400 Å could be fitted equally well by either model, indicating that some of these emission ratios are somewhat independent of the energy dependence of the secondary electron flux. The ratio of the NI 1243 Å to 1084 Å emission is seen to yield an effective correlation for the other observed emissions and a reasonably consistent estimate of the penetration depth of the aurora. |
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