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Short-period solar cycle signals in the ionosphere observed by FORMOSAT-3/COSMIC

Short-period solar cycle signals in the ionosphere observed by FORMOSAT-3/COSMIC,10.1029/2008GL034433,Geophysical Research Letters,Mao-Chang Liang,Kin

Short-period solar cycle signals in the ionosphere observed by FORMOSAT-3/COSMIC   (Citations: 8)
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We analyze 2 years of the FORMOSAT-3/COSMIC GPS radio occultation data to study the response of the Earth's ionosphere to the solar rotation (27-day) induced solar flux variations. Here we report electron density variations in the ionosphere (~100-500 km) associated with the 27-day solar cycle. The peak-to-peak variation in electron density at low latitudes in the F2 region is about ~104-105 electrons cm-3 or 20-40%, and can be as high as 60% depending on altitude, latitude, and season. The half and double periods of the 27-day are also observed at an amplitude comparable to that of the 27-day. The results place useful constraints for modeling chemical and dynamical processes in the ionosphere.
Journal: Geophysical Research Letters - GEOPHYS RES LETT , vol. 35, no. 15, 2008
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    • ...[5] Recently, a solar‐terrestrial connection has been elucidated among open‐field coronal holes, high‐speed solar wind streams, enhanced geomagnetic activity, and modifications in the thermosphere‐ionosphere during the latter part of solar cycle 23 [e.g., Crowley et al. ,2 008; Lei et al., 2008a, 2008b, 2008c, 2010; Mlynczak et al., 2008; Thayer et al., 2008; Zhang et al., 2010]...

    Jing Liuet al. Response of the topside ionosphere to recurrent geomagnetic activity

    • ...Lei et al. [2010] have made a detailed investigation of the interplanetary SW parameters during 2008 and identified the presence of 38 CIRs in the entire year 2008 using the method described by McPherron et al. [2009]...
    • ...Thus, the results in Figures 4a–4e and the results of Lei et al. [2010] indicate that a series of CIRs is formed at a quasi 9 day periodicity because of the interaction of fast SW stream trajectories from equatorward extended or low‐latitude (probably isolated) CHs with the preceding ambient slow SW streams...
    • ...It should be mentioned here that although in Figure 4 the SW and geomagnetic activity indexes are shown only for days 1 to 120 in 2008, for better visibility, HSS‐CIR‐associated geomagnetic storms of moderate levels are observed almost throughout the year [e.g., Lei et al., 2010]...

    S. Tulasi Ramet al. Periodic solar wind forcing due to recurrent coronal holes during 1996...

    • ...stratosphere/mesosphere (11-13), thermosphere (14), and ionosphere (15), and the solar...

    Mao-Chang Liang. Quasi 27-day oscillation in the atmosphere as a tool for calibrating c...

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