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| Titel |
Quasi-Stationary Global Auroral Ionospheric Model: E-layer |
| VerfasserIn |
Vera Nikolaeva, Evgeny Gordeev, Andrey Kotikov, Ludmila Makarova, Aleksander Shirochkov |
| Konferenz |
EGU General Assembly 2014
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250086580
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| Publikation (Nr.) |
 EGU/EGU2014-472.pdf |
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| Zusammenfassung |
| E-layer Auroral Ionospheric Model (E-AIM) is developed to provide temporal and spatial
density distribution of the main ionosphere neutral species (NO, N(4S),N(2D)), and ions
(N2+, NO+,O2+,O+) in the altitude range from 90 to 150 km. NRLMSISE-00 model
[Picone et al., JGR 2003] is used for neutral atmosphere content and temperature
determination, that is the input for the E-AIM model. The E-AIM model based on chemical
equilibrium state in E-layer that reaches in chemical reactions between ionospheric
species considering solar radiation ionization source, superposed with sporadic
precipitation of magnetospheric electrons. The chemical equilibrium state in each
location under specific solar and geomagnetic activity conditions reaches during
numerical solution of the continuity equations for the neutrals and ions using the
high-performance Gear method [Gear, 1971] for ordinary differential equation
(ODE) systems. Applying the Gear method for solving stiff ODE system strongly
reduce the computation time and machine resources comparing to widely used
methods and provide an opportunity to calculate the global spatial E-layer ion content
distribution.
In contrast to the mid-latitude ionosphere, structure and dynamics of the auroral zone
ionosphere (Ï - 60-75° MLat) associated not only with shortwave solar radiation.
Precipitating magnetospheric particle flux is the most important ionization source and is the
main cause of E-layer disturbances. Precipitated electrons with initial energies of 1 - 30 keV
influence the auroral ionosphere E-layer. E-AIM model can estimate ionization
rate corresponds to auroral electron precipitation in two different ways: 1. with
direct electron flux satellite data; 2. with differential energy spectrum reconstructed
from OVATION-Prime empirical model [Newell, JGR 2009] average values, that
allows to estimate ionosphere ion content for any time and location in the auroral
zone.
Comparison of E-AIM results with direct ionospheric observations (ionosonde,
incoherent scatter radar) show good agreement of electron concentration vertical distribution
values. |
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