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| Titel |
On I(5577 Å) and I (7620 Å) auroral emissions and atomic oxygen densities |
| VerfasserIn |
R. L. Gattinger, E. J. Llewellyn, A. Vallance Jones |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 14, no. 7 ; Nr. 14, no. 7, S.687-698 |
| Datensatznummer |
250012350
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| Publikation (Nr.) |
 copernicus.org/angeo-14-687-1996.pdf |
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| Zusammenfassung |
| A model of auroral electron deposition
processes has been developed using Monte Carlo techniques to simulate electron
transport and energy loss. The computed differential electron flux and pitch
angle were compared with in situ auroral observations to provide a check on the
accuracy of the model. As part of the energy loss process, a tally was kept of
electronic excitation and ionization of the important atomic and molecular
states. The optical emission rates from these excited states were computed and
compared with auroral observations of η(3914 Å), η(5577 Å),
η(7620 Å) and η(N2VK). In particular, the roles
played by energy transfer from N2(A3Σ+u)
and by other processes in the excitation of O(1S) and O2(b1Σ+g)
were investigated in detail. It is concluded that the N2(A3Σ+u)
mechanism is dominant for the production of OI(5577 Å) in the peak emission
region of normal aurora, although the production efficiency is much smaller than
the measured laboratory value; above 150 km electron impact on atomic oxygen is
dominant. Atomic oxygen densities in the range of 0.75±0.25 MSIS-86 [O] were
derived from the optical comparisons for auroral latitudes in mid-winter for
various levels of solar and magnetic activity. |
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