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| Titel |
Latitudinal and longitudinal dispersion of energetic auroral protons |
| VerfasserIn |
D. A. Lorentzen |
| 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 ; 18, no. 1 ; Nr. 18, no. 1, S.81-89 |
| Datensatznummer |
250013884
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| Publikation (Nr.) |
 copernicus.org/angeo-18-81-2000.pdf |
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| Zusammenfassung |
Using a collision by collision model from
Lorentzen et al., the latitudinal and longitudinal dispersion of single
auroral protons are calculated. The proton energies varies from 1 to 50 keV, and
are released into the atmosphere at 700 km altitude. The dipole magnetic field
has a dip-angle of 8 degrees. Results show that the main dispersion region is at
high altitudes (300-350 km) and occurs during the first few charge exchange
collisions. As the proton travels further down the atmosphere the mean free path
becomes smaller, and as a result the spreading effect will not be as pronounced.
This means that the first few charge exchange collisions fully determines the
width of both the latitudinal and longitudinal dispersion. The volume emission
rate was calculated for energies between 1 and 50 keV, and it was found that
dayside auroral hydrogen emissions rates were approximately 10 times weaker than
nightside emission rates. Simulations were also performed to obtain the
dependence of the particle dispersion as a function of initial pitch-angle. It
was found that the dispersion varies greatly with initial pitch-angle, and the
results are summarized in two tables; a main and an extreme dispersion region.
Key words. Ionosphere (auroral ionosphere; · particle
precipitation) · Space plasma physics · (transport processes) |
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