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A measure of ionospheric irregularities:zonal velocity and its implications for L-band scintillation at low-latitudes

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Earth and Planetary Physics 2021年第5期5卷 450-461页

作者： Claudio Cesaroni Luca Spogli Giorgiana De Franceschi Juliana Garrido Damaceno Marcin Grzesiak Bruno Vani Joao Francisco Galera Monico Vincenzo Romano Lucilla Alfonsi Massimo Cafaro Istituto Nazionale di Geofisica e Vulcanologia Italy SpacEarth Technology Italy Space Research Centre of the Polish Academy of Sciences Poland Instituto Federal de Educação Ciência e Tecnologia de São PauloBrazil Universidade Estadual Paulista“Júlio de Mesquita Filho” Brazil University of Salento Italy

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.

关键词： ionospheric irregularities GNSS scintillation plasma drift velocity low-latitude ionosphere spaced receivers Equatorial Plasma Bubbles

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The first time observations of low-latitude ionospheric irregularities by VHF radar in Hainan

The first time observations of low-latitude ionospheric irre...

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中国科学院地质与地球物理研究所2012年度（第12届）...

作者： NING BaiQi HU LianHuan LI GuoZhu LIU LiBo WAN WeiXing Institute of Geology and Geophysics Chinese Academy of Sciences Beijing National Observatory of Space Environment Graduate University of Chinese Academy of Sciences Beijing National Observatory of Space Environment

Sanya VHF radar(18.4°N,109.6°E,dip latitude 12.8°N) at Hainan Island is the first coherent backscatter radar for sounding low-latitude ionospheric irregularities in the mainland of China.In this paper,we present the first results of low-latitude ionospheric E and F region irregularities using the radar data during the period from February 2009 to March 2010.The Doppler velocity of radar echoes from E region field aligned irregularities(FAIs) was about several tens of meters per second,while the Doppler spectral width was appreciably larger than the velocity,and could reach one hundred meters per second,indicating that the observed E region FAIs belonged to type 2 irregularities.The observations of range time intensity(RTI) maps of FAIs showed that E region irregularities most often occurred at night within the altitude range 85-115 km,and were rarely observed at afternoon hours.The percentage occurrence of F region FATs maximized during spring months(Feb.-May) with a peak value over 80%.The heights at which the strongest echo related FAIs occurred were mainly around 100 km,lower than h’Es and the difference is mostly 10-20 km.December solstice seemed to be the minimum period of occurrence when the FAI echoes were commonly detected at a narrow altitude range 90-100 km.Moreover,simultaneous radar and GPS observations during spread F events in the pre-rmdnight hours of solar minimum revealed that significant GPS L band scintillations coincided with the appearance of F region plasma plume structures,which extended up to 450 km in altitude.

关键词： low-latitude ionosphere ionospheric irregularities VHF radar

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