The 27-day modulation of the low-latitude ionosphere during a solar maximum
作者： Kyoung Min , Jaeheung Park , Heejun Kim , Vitaly Kim , Hyosub Kil
DOI: 10.1029/2008JA013881
关键词: Solar maximum 、 Thermosphere 、 TEC 、 Geodesy 、 Physics 、 Altitude 、 Local time 、 Total electron content 、 Ionosphere 、 Solar rotation
摘要: [1] The 27-day solar modulation of the low-latitude ionosphere is investigated for maximum period using in situ satellite measurement data and total electron contents (TEC) estimated from signals global positioning system (GPS). Whereas density temperature topside observed at an altitude 685 km manifest delayed responses to variations daily F10.7 values, similar those previously reported 840 km, nighttime-scale height, obtained by comparing densities altitudes local times, was shown vary accordance with changes same time delay. The oxygen ion fraction measured shows a response regardless time. Moreover, GPS TEC most which come F peak region, also exhibit modulations rotation. value correlates well thermospheric neutral density, both are be modulated rotation delay, especially when long-term variation filtered out. present result confirms that whole ionospheric
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