Statistical characteristics of low latitude ionospheric field-aligned irregularities obtained with the Piura VHF radar
| dc.contributor.author | Chau Chong Shing, Jorge Luis | |
| dc.contributor.author | Woodman Pollitt, Ronald Francisco | |
| dc.contributor.author | Flores, L. A. | |
| dc.date.accessioned | 2018-07-13T12:14:06Z | |
| dc.date.available | 2018-07-13T12:14:06Z | |
| dc.date.issued | 2002-03 | |
| dc.description.abstract | We present a summary of the statistical characteristics of echoes from ionospheric (E- and F-region) field- aligned irregularities obtained with the Piura VHF radar. This radar is located at ∼7.0° dip latitude, just outside the equatorial electrojet (EEJ) region. Our results are based on (1) intermittent observations made between 1991 and 1999 just few days a year, and (2) continuous observations made between January 2000 and June 2001. During most of the intermittent observations, simultaneous measurements of EEJ and equatorial spread F (ESF) irregularities were performed with the Jicamarca VHF radar. From the continuous measurements, we have obtained the diurnal and seasonal characteristics of a variety of parameters (percentage of occur- rence, signal-to-noise ratio and/or Doppler velocities) from the lower and upper E-region irregularities and also from F-region irregularities over Piura. For example, we have found that (1) the E-region echoes are stronger and occur more frequently during local summer (i.e. between December and March); (2) between May and June, the E-region echoes are weaker and occur less frequently; moreover, during these months, a semidiurnal wave with large amplitudes is observed in the meridional wind ( > 100 m s − 1 ); (3) there is vertical wavelength of about 20 km in the Doppler velocity, particularly after midnight; (4) the lower (upper) E- region Doppler velocities are influenced mainly by meridional winds (equatorial F-region vertical drifts). In addition, we have observed that the seasonal and daily occurrences of Piura F-region irregularities are similar to the occurrence of topside ESF irregularities over Jicamarca. The likelihood of occurrence of F-region irregularities over Piura and, therefore, topside ESF over Jicamarca is greater when there are no E-region irregularities over Piura. On the other hand, there is more probability of observing bottomtype/bottomside ESF irregularities over Jicamarca when E-region irregularities are observed over Piura. | es_ES |
| dc.description.peer-review | Por pares | es_ES |
| dc.format | application/pdf | es_ES |
| dc.identifier.citation | Chau, J. L., Woodman, R. F., & Flores, L. A. (2002). Statistical characteristics of low latitude ionospheric field-aligned irregularities obtained with the Piura VHF radar.==$ Annales Geophysicae, 20$==(8), 1203-1212. https://doi.org/10.5194/angeo-20-1203-2002 | es_ES |
| dc.identifier.doi | https://doi.org/10.5194/angeo-20-1203-2002 | es_ES |
| dc.identifier.govdoc | index-oti2018 | |
| dc.identifier.journal | Annales Geophysicae | es_ES |
| dc.identifier.uri | http://hdl.handle.net/20.500.12816/1801 | |
| dc.language.iso | eng | es_ES |
| dc.publisher | European Geosciences Union | es_ES |
| dc.relation.ispartof | urn:issn:0992-7689 | |
| dc.rights | info:eu-repo/semantics/restrictedAccess | es_ES |
| dc.subject | Ionosphere | es_ES |
| dc.subject | Ionospheric irregularities | es_ES |
| dc.subject | Equatorial ionosphere | es_ES |
| dc.subject.ocde | http://purl.org/pe-repo/ocde/ford#1.05.01 | es_ES |
| dc.title | Statistical characteristics of low latitude ionospheric field-aligned irregularities obtained with the Piura VHF radar | es_ES |
| dc.type | info:eu-repo/semantics/article | es_ES |