Spread F, GPS phase fluctuations, and plasma bubbles near the crest of equatorial ionization anomaly during solar maximum
Spread F, GPS phase fluctuations, and plasma bubbles near the crest of equatorial ionization anomaly during solar maximum
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DOI：
10.1029/2009ja014195
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发表时间：
2009-08
影响因子：
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通讯作者：
C. C. Lee-C.;F. Chu;Wei-Sheng Chen;Jann‐Yenq Liu;S. Su;Y. Liou;Shui‐Beih Yu
中科院分区：
文献类型：
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作者：
C. C. Lee-C.;F. Chu;Wei-Sheng Chen;Jann‐Yenq Liu;S. Su;Y. Liou;Shui‐Beih Yu
[1]本文首次尝试同时研究赤道电离异常峰附近的扩展F、GPS相位起伏和等离子体泡的出现概率。观测数据由电离层探测仪，GPS接收器，和中华卫星一号在2000年，太阳极大年。结果表明，距离扩展F（RSF）的出现不同于频率扩展F（FSF）的出现。在季节变化上，RSF的发生在3月和9月有最大值，而FSF的发生在6月有最大值。对于夜间变化，RSF和FSF峰值分别在2300和0300 LT。关于GPS相位波动，应用指数Fp来表征不规则强度。50 < Fp ≤ 200与RSF的相似性表明，形成50 < Fp ≤ 200的F区不规则体特征主要与RSF有关。200 < Fp的出现几乎不存在。在中华卫星一号对等离子体气泡的观测中，也发现了这一罕见现象。此外，GPS相位波动在EIA波峰和倾角赤道的季节变化有类似的趋势。这表明RSF和EIA峰处50 < Fp ≤ 200的F区不规则性起源于赤道电离层。另一方面，在EIA波峰的FSF发生概率的季节变化接近中纬度的扩展F。这表明FSF和中纬扩散F的产生机制可能是相同的，但还需要进一步研究。
[1] This work is the first attempt to concurrently study the occurrence probabilities of spread F, GPS phase fluctuations, and plasma bubbles near the crest of equatorial ionization anomaly (EIA). The data were observed by an ionosonde, a GPS receiver, and ROCSAT-1 during 2000, the solar maximum year. Results show that the occurrences of the range spread F (RSF) differ from those of the frequency spread F (FSF). For the seasonal variation, the RSF occurrence has the maximum values in March and September, while the FSF occurrence peaks at June. For the nighttime variation, RSF and FSF peak at 2300 and 0300 LT, respectively. Regarding the GPS phase fluctuations, an index Fp is applied to characterize the irregularity strength. The similarity between the 50 < Fp ≤ 200 and RSF occurrences demonstrates that the characteristics of F region irregularities forming 50 < Fp ≤ 200 are mainly related to RSF. The occurrence of 200 < Fp is almost absent. The rare event is also found in the observation of plasma bubbles by ROCSAT-1. Furthermore, the seasonal variations in GPS phase fluctuations at the EIA crest and the dip equator have similar trends. This indicates that the F region irregularities of RSF and 50 < Fp ≤ 200 at the EIA crest are originated from the equatorial ionosphere. On the other hand, the seasonal variation in occurrence probability of FSF at the EIA crest is close to that of spread F at midlatitudes. This suggests that the generation mechanisms of FSF and midlatitude spread F might be same, but the further study is required.