Chinese photographer wins astronomy prize

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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First ever VLF monitoring of the lunar occultation of a solar flare during the 2010 annular solar eclipse and its effects on the D-region electron density profile

Planetary and Space Science ◽

10.1016/j.pss.2012.08.016 ◽

2012 ◽

Vol 73 (1) ◽

pp. 310-317 ◽

Cited By ~ 18

Author(s):

Sujay Pal ◽

Surya K. Maji ◽

Sandip K. Chakrabarti

Keyword(s):

Solar Flare ◽

Electron Density ◽

Density Profile ◽

Solar Eclipse ◽

Electron Density Profile ◽

Lunar Occultation ◽

D Region ◽

Annular Solar Eclipse

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Drastic variation in the surface boundary layer parameters over Cochin during the annular solar eclipse: Analysis using sonic anemometer data

Journal of Atmospheric and Solar-Terrestrial Physics ◽

10.1016/j.jastp.2012.12.019 ◽

2013 ◽

Vol 94 ◽

pp. 49-53 ◽

Cited By ~ 8

Author(s):

P.R. Jayakrishnan ◽

C.A. Babu ◽

Sivaprasad P.

Keyword(s):

Boundary Layer ◽

Solar Eclipse ◽

Sonic Anemometer ◽

Surface Boundary ◽

Surface Boundary Layer ◽

Sonic Anemometer Data ◽

Annular Solar Eclipse

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The Correlations Between Acoustical Gravity Waves Caused by Solar Eclipse and the Solar Radiation

Journal of Low Frequency Noise Vibration and Active Control ◽

10.1177/026309239201100201 ◽

1992 ◽

Vol 11 (2) ◽

pp. 37-41 ◽

Cited By ~ 1

Author(s):

Jinlai Xie ◽

Xunren Yang ◽

Qitai Li

Keyword(s):

Solar Radiation ◽

Gravity Waves ◽

Solar Eclipse ◽

Ground Level ◽

Atmospheric Moisture ◽

Important Conclusion ◽

Moisture Condition ◽

Open Question ◽

Annular Solar Eclipse ◽

Abundant Data

Can solar eclipses generate AGWs? If so, how are they excited? This is still an open question and a long-standing dispute within academic circles. The annular solar eclipse which traversed the Chinese mainland on September 23rd 1987 afforded a rare and excellent opportunity to study this problem. Vast amounts of data of microbarometric pressure at ground level, radio-sondage, solar radiation and ionospheric probing were obtained from various observation stations. By making use of these abundant data synthetically, an important conclusion has been reached: there is an obvious accord between the period of the solar eclipse, AGW and the fluctuation period of solar direct radiation. All the solar eclipse AGWs in different places come from two different kinds of atmospheric oscillation, i.e., the forced oscillation generated directly by changes in direct solar radiation and the buoyancy oscillation in the local atmosphere above various spots. The former has a longer wave period and a larger amplitude, depending directly upon the radiation change during the solar eclipse; the latter has a shorter period and smaller amplitude, depending upon thermodynamic stability in the local atmosphere during the solar eclipse and the atmospheric moisture condition.

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