Artículo

Indirect determination of the energy spectra of particles precipitated in the lower ionosphere associated with solar proton events

Mendes Da Costa, Aracy

Instituto de Geofísica, UNAM, publicado en Geofísica Internacional, y cosechado de Revistas UNAM

Licencia de uso

Procedencia del contenido

Entidad o dependencia
Instituto de Geofísica, UNAM
Revista
Repositorio
Contacto
Revistas UNAM. Dirección General de Publicaciones y Fomento Editorial, UNAM en revistas@unam.mx

Cita

Mendes Da Costa, Aracy. (2000). Indirect determination of the energy spectra of particles precipitated in the lower ionosphere associated with solar proton events. Geofísica Internacional; Vol. 39 No. 1, 2000. Recuperado de https://repositorio.unam.mx/contenidos/42381

Descripción del recurso

Autor(es)
Mendes Da Costa, Aracy
Tipo
Artículo de Investigación
Área del conocimiento
Físico Matemáticas y Ciencias de la Tierra
Título
Indirect determination of the energy spectra of particles precipitated in the lower ionosphere associated with solar proton events
Fecha
2012-05-01
Resumen
Electron density profiles previously measured using the phase and amplitude of VLF radio signals during outstanding solar proton events (SPE), together with the associated energy spectra of protons and electrons simultaneously measured by satellite, allowed the calculation of the electron-ion pair production rate q(h), for the sub-Antarctic and South Atlantic Geomagnetic Anomaly (SAGA) regions. Plots of q(h) together with the predetermined electron density vertical profiles were used to calculate the effective recombination coefficient ψ(h) for the SAGA region. Assuming that the chemical processes in the lower ionosphere due to the impact of neutral atmospheric constituents are basically the same, the spectra of the energetic particles responsible for the delayed ionization detected in the SAGA were estimated indirectly. The parameters obtained are in good agreement with results for the northern hemisphere and the spectra deduced are within the limits imposed by the cutoff rigidity and the penetration depth of the incident particles. The experimental data correspond to VLF signals transmitted from Australia (NWC - 22.3 kHz ) and from Ω-Trinidad (13.6 kHz) and received respectively in Atibaia and Curitiba, Brasil, during the SPE of August 4-7, 1972.
Tema
Ionosphere; solar activity; particle precipitation.; Ionosfera; actividad solar; precipitación de partículas.
Idioma
spa
ISSN
0016-7169

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