Abstract
Abstract. The total solar eclipse of 22 July 2009, was visible from some regions of China and the intense sporadic-E (Es) that broke out during the solar eclipse period over the eastern China provided a unique chance to study solar eclipse effects on the Es-layer. The ground based high-frequency (HF) vertical-incidence and oblique-incidence backscatter radio systems in Wuhan and an HF oblique receivers located in Suzhou were operated to detect the Es-layer. The vertical, oblique and backscatter ionograms of 22 and 23 July were recorded, processed and analyzed. The analyzing results show that the critical frequency of Es, the hop number and power of the rays transmitted from Wuhan to Suzhou as well as the Doppler frequency shift of the one-hop oblique-incidence waves reflected by the Es-layer all increased during the solar eclipse period. These variations are displayed in the paper and explained to be induced by the wind-field, which is produced by the powerful meridional air flows from the sunshine region to the moon's shadow.
Highlights
A solar eclipse provides us with a rare opportunity to study the ionospheric effects associated with an accurately estimated variation of solar radiation during the eclipse period
We describe the observations of Es behavior during the total solar eclipse that occurred over eastern China on 22 July 2009
The critical frequencies of Es recorded by the ionosonde and the delay, echo power and Doppler frequency shift (DFS) recorded by the Suzhou oblique receiver in the eclipse and post-eclipse day are displayed and analyzed
Summary
A solar eclipse provides us with a rare opportunity to study the ionospheric effects associated with an accurately estimated variation of solar radiation during the eclipse period. Wuhan city on the path of the total solar eclipse of 22 July 2009 is one of the perfect locations for observation and it is very convenient for the Ionospheric Laboratory of Wuhan University to carry out the observing experiment. The vertical-incidence ionosonde (Abraham et al, 1998; Altadill et al, 2001; Bamford, 2001; Jakowski et al, 2008), the oblique-incidence ionospheric sounding systems (Boitman et al, 1999) and the oblique-incidence backscatter ionospheric. We describe the observations of Es behavior during the total solar eclipse that occurred over eastern China on 22 July 2009. The variation of Es was observed by three kinds of HF ground based radio systems and useful parameters were obtained from the recorded vertical, oblique and backscatter ionograms. The critical frequencies of Es recorded by the ionosonde and the delay, echo power and Doppler frequency shift (DFS) recorded by the Suzhou oblique receiver in the eclipse and post-eclipse day are displayed and analyzed
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