Indirect determination of the energy spectra of particles precipitated in the lower ionosphere associated with solar proton events
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| Format: | Artículo científico |
| Sprache: | en |
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Universidad Nacional Autónoma de México
2000
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| _version_ | 1876460387694542848 |
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| author | Aracy Mendes da Costa |
| author_facet | Aracy Mendes da Costa |
| contents | Indirect determination of the energy spectra of particles precipitated in the lower ionosphere associated with solar proton events Aracy Mendes da Costa Ciencias de la Tierra Ionosphere solar activity particle precipitation Electron density profiles previously measured using the phase and amplitude of VLF radio signals during outstanding solarproton 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 effectiverecombination coefficient y(h) for the SAGA region. Assuming that the chemical processes in the lower ionosphere due to theimpact of neutral atmospheric constituents are basically the same, the spectra of the energetic particles responsible for the delayedionization detected in the SAGA were estimated indirectly. The parameters obtained are in good agreement with results for thenorthern hemisphere and the spectra deduced are within the limits imposed by the cutoff rigidity and the penetration depth of theincident particles. The experimental data correspond to VLF signals transmitted from Australia (NWC - 22.3 kHz ) and from W-Trinidad (13.6 kHz) and received respectively in Atibaia and Curitiba, Brasil, during the SPE of August 4-7, 1972. 2000 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56839102 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.1 Vol.39 |
| format | Artículo científico |
| id | redalyc_56839102 |
| institution | Redalyc |
| language | en |
| publishDate | 2000 |
| publisher | Universidad Nacional Autónoma de México |
| spellingShingle | Indirect determination of the energy spectra of particles precipitated in the lower ionosphere associated with solar proton events Aracy Mendes da Costa Ciencias de la Tierra Ionosphere solar activity particle precipitation Indirect determination of the energy spectra of particles precipitated in the lower ionosphere associated with solar proton events Aracy Mendes da Costa Ciencias de la Tierra Ionosphere solar activity particle precipitation Electron density profiles previously measured using the phase and amplitude of VLF radio signals during outstanding solarproton 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 effectiverecombination coefficient y(h) for the SAGA region. Assuming that the chemical processes in the lower ionosphere due to theimpact of neutral atmospheric constituents are basically the same, the spectra of the energetic particles responsible for the delayedionization detected in the SAGA were estimated indirectly. The parameters obtained are in good agreement with results for thenorthern hemisphere and the spectra deduced are within the limits imposed by the cutoff rigidity and the penetration depth of theincident particles. The experimental data correspond to VLF signals transmitted from Australia (NWC - 22.3 kHz ) and from W-Trinidad (13.6 kHz) and received respectively in Atibaia and Curitiba, Brasil, during the SPE of August 4-7, 1972. 2000 artículo científico 0016-7169 https://www.redalyc.org/articulo.oa?id=56839102 en http://www.redalyc.org/revista.oa?id=568 Geofísica Internacional application/pdf Universidad Nacional Autónoma de México Geofísica Internacional (México) Num.1 Vol.39 |
| title | Indirect determination of the energy spectra of particles precipitated in the lower ionosphere associated with solar proton events |
| topic | Ciencias de la Tierra Ionosphere solar activity particle precipitation |
| url | https://www.redalyc.org/articulo.oa?id=56839102 |