Indirect determination of the energy spectra of particles precipitated in the lower ionosphere associated with solar proton events
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 p...
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Universidad Nacional Autónoma de México, Instituto de Geofísica
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ftdoajarticles:oai:doaj.org/article:6dacf03f536f4c80ba60968f4b12f680 2023-10-09T21:45:52+02:00 Indirect determination of the energy spectra of particles precipitated in the lower ionosphere associated with solar proton events Aracy Mendes da Costa 2000-01-01T00:00:00Z https://doaj.org/article/6dacf03f536f4c80ba60968f4b12f680 EN ES eng spa Universidad Nacional Autónoma de México, Instituto de Geofísica http://www.geofisica.unam.mx/unid_apoyo/editorial/publicaciones/investigacion/geofisica_internacional/anteriores/2000/01/mendes.pdf https://doaj.org/toc/0016-7169 0016-7169 https://doaj.org/article/6dacf03f536f4c80ba60968f4b12f680 Geofísica Internacional, Vol 39, Iss 1, Pp 13-19 (2000) Ionosphere solar activity particle precipitation Geophysics. Cosmic physics QC801-809 article 2000 ftdoajarticles 2023-09-10T00:48:41Z 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. Article in Journal/Newspaper Antarc* Antarctic Directory of Open Access Journals: DOAJ Articles Antarctic Trinidad ENVELOPE(-60.734,-60.734,-63.816,-63.816) |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English Spanish |
topic |
Ionosphere solar activity particle precipitation Geophysics. Cosmic physics QC801-809 |
spellingShingle |
Ionosphere solar activity particle precipitation Geophysics. Cosmic physics QC801-809 Aracy Mendes da Costa Indirect determination of the energy spectra of particles precipitated in the lower ionosphere associated with solar proton events |
topic_facet |
Ionosphere solar activity particle precipitation Geophysics. Cosmic physics QC801-809 |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Aracy Mendes da Costa |
author_facet |
Aracy Mendes da Costa |
author_sort |
Aracy Mendes da Costa |
title |
Indirect determination of the energy spectra of particles precipitated in the lower ionosphere associated with solar proton events |
title_short |
Indirect determination of the energy spectra of particles precipitated in the lower ionosphere associated with solar proton events |
title_full |
Indirect determination of the energy spectra of particles precipitated in the lower ionosphere associated with solar proton events |
title_fullStr |
Indirect determination of the energy spectra of particles precipitated in the lower ionosphere associated with solar proton events |
title_full_unstemmed |
Indirect determination of the energy spectra of particles precipitated in the lower ionosphere associated with solar proton events |
title_sort |
indirect determination of the energy spectra of particles precipitated in the lower ionosphere associated with solar proton events |
publisher |
Universidad Nacional Autónoma de México, Instituto de Geofísica |
publishDate |
2000 |
url |
https://doaj.org/article/6dacf03f536f4c80ba60968f4b12f680 |
long_lat |
ENVELOPE(-60.734,-60.734,-63.816,-63.816) |
geographic |
Antarctic Trinidad |
geographic_facet |
Antarctic Trinidad |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Geofísica Internacional, Vol 39, Iss 1, Pp 13-19 (2000) |
op_relation |
http://www.geofisica.unam.mx/unid_apoyo/editorial/publicaciones/investigacion/geofisica_internacional/anteriores/2000/01/mendes.pdf https://doaj.org/toc/0016-7169 0016-7169 https://doaj.org/article/6dacf03f536f4c80ba60968f4b12f680 |
_version_ |
1779321535905923072 |