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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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New findings of ionospheric longitudinal variations at mid-latitudes

New findings of ionospheric longitudinal variations at mid-l...

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第十四届全国日地空间物理学术研讨会

作者： John Foster Anthea Coster phil erickson John Holt MIT Haystack Observatory Westford MA 01886 USA

＜正＞This paper reports on new findings of pronounced longitudinal variations in mid‐latitude electron density over the continental US, manifested as a large-scale east-west coast difference in TEC as well as east-west difference in electron density from incoherent scatter radar （ISR） extra-wide coverage over Millstone *** implication of these results on other longitudes is also addressed. A common feature of these longitudinal east-west differences is a clear local-time variation where in the evening sectorelectron density

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