Comparison of the characteristics of ionospheric parameters obtained from FORMOSAT-3 and digisonde over Ascension Island
Comparison of the characteristics of ionospheric parameters obtained from FORMOSAT-3 and digisonde over Ascension Island
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DOI：
10.5194/angeo-31-787-2013
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发表时间：
2013-05
影响因子：
1.9
通讯作者：
Y. Chuo;C. C. Lee-C.;W. S. Chen;B. Reinisch
中科院分区：
文献类型：
--
作者：
Y. Chuo;C. C. Lee-C.;W. S. Chen;B. Reinisch
抽象的。利用福卫三号射电掩星（RO）测量阿森松岛上空获得的电子密度剖面数据，研究国际参考电离层（IRI）模型中的底面厚度参数B0、F区峰值高度周围的刻度高度以及其他F2区参数。 RO数据是在2006年5月至2008年4月太阳最活动期阿森松岛（345.6°E，8.0°S）发生射电掩星时采集的。结果表明，B0值与春分期（相关系数r = 0.682）和冬季（r = 0.570）地面观测结果吻合程度较高，夏季相关性较强（r = 0.750）。阿森松岛 B0 的季节性和日变化在白天和冬季呈现峰值。此外，白天和夜间 RO 测量中的 B0 值分别被低估和高估。此外，尺度高度的比较表明，从检索数据获得的尺度高度与数字观测得到的尺度高度在三个季节都呈弱相关性。此外，虽然有效鳞高（HT）值与 RO 测量获得的值相反，并且夜间高于白天，但它们与地面观测值非常一致。本文还全面讨论了非对称电离层电子密度剖面对 RO 测量的影响。
Abstract. Electron density profile data obtained from the FORMOSAT-3 radio occultation (RO) measurements over Ascension Island are used to study the bottomside thickness parameter B0 in the International Reference Ionosphere (IRI) model, scale height around the F region peak height, and other F2 region parameters. The RO data were collected when the radio occultation occurred at Ascension Island (345.6° E, 8.0° S) during the solar minimum activity period from May 2006 to April 2008. Results show that the B0 values are in moderate agreement with the ground-based observations in the equinox period (correlation coefficient r = 0.682) and winter (r = 0.570), with a strong correlation in summer (r = 0.750). The seasonal and diurnal variations in B0 over Ascension Island show peak values during the daytime and in winter. In addition, the B0 values were underestimated and overestimated in the RO measurements during the daytime and nighttime, respectively. Moreover, the comparison of scale heights shows that scale heights obtained from the retrieved data and digisonde observations are weakly correlation in all three seasons. Furthermore, although the effective scale height (HT) values were reverse of those obtained from the RO measurements and are higher during the nighttime than in the daytime, they are in good agreement with those from ground-based observations. This paper also provides a comprehensive discussion of the effect of the asymmetric ionospheric electron density profiles on RO measurements.