Recent progress in solar physics made during the program of 2008 August 1st solar total eclipse

Zhang, Hongqi; Mei, Zhang; Lin, Jin‐Ming; Chen, P. F.; Fang, Cheng

doi:10.1007/s11434-010-4046-y

Cited by 3 publications

(3 citation statements)

References 39 publications

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“…Jung-Hee Kim et al, 2018 [ 14 ] measured the gravity and magnetic field during the solar eclipse and compared it with the results from the same location during the solar eclipse on 11 August 1999. Zhang et al, 2010 [ 15 ] used the study on the dynamic process of the ionosphere over China during the partial eclipse of 11 August 2018, as an example, and found that the electron density of the ionosphere exhibited a quasi-periodic oscillation with amplitudes in the range of 9–14% with a maximum decrease of 26%.…”

Section: Introductionmentioning

confidence: 99%

Variation of Low-Frequency Time-Code Signal Field Strength during the Annular Solar Eclipse on 21 June 2020: Observation and Analysis

Wang

Zhao

et al. 2021

Sensors

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Due to the occlusion of the moon, an annular solar eclipse will have an effect on the ionosphere above the earth. The change of the ionosphere, for the low-frequency time-code signal that relies on it as a reflection medium for long-distance propagation, the signal field strength, and other parameters will also produce corresponding changes, which will affect the normal operation of the low-frequency time-code time service system. This paper selects the solar eclipse that occurred in China on 21 June 2020, and uses the existing measurement equipment to carry out experimental research on the low-frequency time-code signal. We measured and analyzed the signal field strength from 20 June 2020 to 23 June 2020, and combined solar activity data, ionospheric data, and geomagnetic data, and attempted to explore the reasons and rules of the change of signal parameters. The results showed that the field strength of the low-frequency time-code signal changed dramatically within a short time period, the max growth value can reach up to 17 dBμV/m and the variation trend yielded ‘three mutations’. This change in signal field strength is probably due to the occurrence of a solar eclipse that has an effect on the ionosphere. When the signal propagation conditions change, the signal strength will also change accordingly.

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Section: Introductionmentioning

confidence: 99%

Variation of Low-Frequency Time-Code Signal Field Strength during the Annular Solar Eclipse on 21 June 2020: Observation and Analysis

Wang

Zhao

et al. 2021

Sensors

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“…Those results are related to many subjects of solar physics, such as the spectra and polarizations of the solar chromosphere and corona, and the fine structures of corona. More details can be found in a review of Zhang et al [18].…”

Section: Introductionmentioning

confidence: 99%

Polar plumes observed at the total solar eclipse in 2009

Yang

Zhang

et al. 2011

Sci. China Phys. Mech. Astron.

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During the total solar eclipse of July 22, 2009, we carried out a white-light observation in Anji, Zhejiang, China. The aim was to observe the polar plumes (PPs) with high spatial and temporal resolutions in white-light. With the observational data, we investigate the properties and evolution of the PPs and compare them with those of the low-latitude plumes (LPs). We find that both the PPs and the LPs have comparable lengths and widths, and the mean length and width are 300 Mm and 16 Mm, respectively. The average inclination angle (13 degree) of the PPs is smaller than that (32 degree) of the LPs. Generally, the plumes which are closer to the coronal hole center are more vertical. We trace the PPs and the LPs in the sequence of images and find that none of them disappears and no new one is created. Additionally, neither plasma outflow nor transverse oscillation is observed. These imply that the evolution process of plumes is much longer than the timescale of eclipse.

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“…Over the past 20 years, his work has not only covered vector magnetic field measurements of solar active regions [1,2] but also the ubiquitous small-scale magnetic field in quietSun regions [3]. This work has inspired many of his Chinese colleagues to contribute in these areas [4,5].…”

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confidence: 99%