A measure of ionospheric irregularities:zonal velocity and its implications for L-band scintillation at low-latitudes
A measure of ionospheric irregularities: zonal velocity and its implications for L-band scintillation at low-latitudes作者机构:Istituto Nazionale di Geofisica e VulcanologiaItaly SpacEarth TechnologyItaly Space Research Centre of the Polish Academy of SciencesPoland Instituto Federal de EducaçãoCiência e Tecnologia de São PauloBrazil Universidade Estadual Paulista“Júlio de Mesquita Filho”Brazil University of SalentoItaly
出 版 物:《Earth and Planetary Physics》 (地球与行星物理(英文版))
年 卷 期:2021年第5卷第5期
页 面:450-461页
核心收录:
学科分类:07[理学] 070802[理学-空间物理学] 0708[理学-地球物理学]
基 金:funded by FAPESP(Process 06/04008-2) funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Sk?odowska-Curie Actions grant agreement No 722023。
主 题:ionospheric irregularities GNSS scintillation plasma drift velocity low-latitude ionosphere spaced receivers Equatorial Plasma Bubbles
摘 要:We estimate the zonal drift velocity of small-scale ionospheric irregularities at low latitude by leveraging the spaced-receivers technique applied to two GNSS receivers for scintillation monitoring installed along the magnetic parallel passing in Presidente Prudente(Brazil,magnetic latitude 12.8°S).The investigated ionospheric sector is ideal to study small-scale irregularities,being located close to the expected position of the southern crest of the equatorial ionospheric anomaly.The measurement campaign took place between September 2013 and February 2014,i.***.equinox and summer solstice seasons under solar maximum,during which the probability of formation of small-scale irregularities is expected to maximize.We found that the hourly average of the velocity increases up to 135 m/s right after the local sunset at ionospheric altitudes and then smoothly decreases in the next hours.Such measurements are in agreement with independent estimations of the velocity made by the Incoherent Scatter Radar located at the Jicamarca Radio Observatory(magnetic latitude 0.1°N),by the Boa Vista Ionosonde(magnetic latitude 12.0°N),and by applying a recently-developed empirical regional short-term forecasting model.Additionally,we investigated the relationship with the percentage occurrence of amplitude scintillation;we report that it is exponentially dependent on the zonal velocity of the irregularities that cause it.