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Ionospheric longitudinal variations at midlatitudes: Incoherent scatter radar observation at Millstone Hill

Science China(Technological Sciences) 2012年第5期55卷 1153-1160页

作者： COSTER Anthea HOLT John FOSTER John ERICKSON Phil MIT Haystack Observatory Off Route 40 Westford MA 01866 USA

Incoherent scatter radar （ISR） extra-wide coverage experiments during the period of 1978-2011 at Millstone Hill are used to investigate longitudinal differences in electron density. This work is motivated by a recent finding of the US east-west coast difference in TEC suggesting a combined effect of changing geomagnetic declination and zonal winds. The current study pro- vides strong supporting evidence of the longitudinal change and the plausible mechanism by examining the climatology of electron density Ne on both east and west sides of the radar with a longitude separation of up to 40% for different heights within 300-450 kin. Main findings include： 1） The east-west difference can be up to 60% and varies over the course of the day, being positive （East side Ne 〉 West side Ne） in the late evening, and negative （West side Ne 〉 East side Ne） in the pre-noon. 2） The east-west difference exists throughout the year. The positive （relative） difference is most pronounced in winter; the negative （relative） difference is most pronounced in early spring and later summer. 3） The east-west difference tends to enhance toward decreasing solar activity, however, with some seasonal dependence; the enhancements in the positive and negative differences do not take place simultaneously. 4） Both times of largest positive and largest negative east-west differences in Ne are earlier in summer and later in winter. The two times differ by 12-13 h, which remains constant throughout the year. 5） variations at different heights from 300-450 km are similar. Zonal wind climatology above Millstone Hill is found to be perfectly consistent with what is expected based on the electron density difference between the east and west sides of the site. The magnetic declination-zonal wind mechanism is true for other longitude sectors as well, and may be used to understand longitudinal variations elsewhere. It may also be used to derive thermospheric zonal winds.

关键词： midlatitude ionosphere geomagnetic declination thermospheric zonal winds longitudinal variation incoherent scatterradar

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Simulated longitudinal variations in the E-region plasma density induced by non-migrating tides

Simulated longitudinal variations in the E-region plasma den...

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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）学术年会

作者： Zhipeng Ren Weixing Wan Libo Liu Jiangang Xiong Beijing National Observatory of Space Environment Institute of Geology and GeophysicsChinese Academy of Sciences

Based on the GCITEM-IGGCAS model and tides from TIMED/SABER observations,the longitudinal variations of the E-region plasma densities,which is induced by non-migrating tides,are investigated. We simulated the intra-annual variation of the E-region plasma density,and found that equinoctial E-region plasma density shows an obvious wavenumber-4 longitudinal structure both in Equinox and in June Solstice,and a wavenumber-3 longitudinal structure in December *** simulations suggest that DE3 tide can drive the wavenumber-4 structure in E-region plasma density,and DE2 tide can drive the wavenumber-3 structure.O controls the longitudinal variations of total ions density at lower E-region,and NO mainly controls that at higher *** also noticed that the longitudinal variations of O and of NO show obvious phase differences.

关键词： longitudinal variation E-region plasma density Non-migrating tides

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Variability of the Critical Frequency foF2 during Minimum and Maximum Phases of Solar Cycles 20 and 21: A Comparative Study between American and African Equatorial Regions

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Atmospheric and Climate Sciences 2022年第1期12卷 105-112页

作者： Kaboré M’Bi Diabaté Abidina Ouattara Frédéric Laboratoire de Recherche en Energétique et Météorologie de l’Espace (LAREME) Université Norbert Zongo Koudougou Burkina Faso Laboratoire de Matériaux d’Héliophysique et Environnement (LAMHE) Université Nazi Boni Bobo Dioulasso Burkina Faso

The present work is a comparative study between the foF2 variabilities for two equatorial regions (Ouagadougou: lat. 12°21'N;long. 1°30'E, dip. 1.43° in Africa and Huancayo: Lat. 12°S;Long. 75°12'W in America) during solar cycles 20 and 21 minima and maxima phases under geomagnetic extreme conditions (quiet and disturb). Profiles from these two stations are very similar for all the seasons over the solar cycles. However, measured data from Huancayo station are higher than those from Ouagadougou station during

关键词： foF2 longitudinal variation Seasonal variation

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