scholarly journals Impact of the annular solar eclipse on June 21, 2020 on BPL time service performance

AIP Advances ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 115003
Author(s):  
Yingming Chen ◽  
Ping Feng ◽  
Liu Changhong ◽  
Yongqi Chen ◽  
Luxi Huang ◽  
...  
Keyword(s):  
Solar Eclipse ◽  
Service Performance ◽  
Time Service ◽  
Annular Solar Eclipse

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

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1216
Author(s):  
Xin Wang ◽  
Bo Li ◽  
Fan Zhao ◽  
Xinyu Luo ◽  
Luxi Huang ◽  
...  
Keyword(s):  
Field Strength ◽  
Solar Eclipse ◽  
Low Frequency ◽  
Signal Propagation ◽  
Normal Operation ◽  
Time Code ◽  
Long Distance ◽  
Time Service ◽  
Annular Solar Eclipse ◽  
Signal Field

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.

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

1992 ◽  
Vol 11 (2) ◽  
pp. 37-41 ◽  
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.

Chinese photographer wins astronomy prize

Physics World ◽  
2021 ◽  
Vol 34 (11) ◽  
pp. 9ii-9ii
Author(s):  
Michael Banks
Keyword(s):  
Solar Eclipse ◽  
Annular Solar Eclipse

Chinese photographer Shuchang Dong has won the 2021 Astronomy Photographer of the Year for an image depicting the annular solar eclipse on 21 June 2020.

An Annular Solar Eclipse

Weatherwise ◽  
1984 ◽  
Vol 37 (2) ◽  
pp. 86-89
Author(s):  
Joseph Rao
Keyword(s):  
Solar Eclipse ◽  
Annular Solar Eclipse

On the variation of the direct solar radiation during the annular solar eclipse of April 29, 1976

Solar Physics ◽  
1979 ◽  
Vol 62 (2) ◽  
pp. 401-405 ◽  
Author(s):  
J. Deliyannis ◽  
D. Papathanasoglou ◽  
M. Stathopoulou-Tsoga
Keyword(s):  
Solar Radiation ◽  
Solar Eclipse ◽  
Direct Solar Radiation ◽  
Annular Solar Eclipse

Ionospheric Response to the 21 May 2012 Annular Solar Eclipse Over Taiwan

2019 ◽  
Vol 124 (5) ◽  
pp. 3623-3636 ◽  
Author(s):  
J. Y. Liu ◽  
S. S. Yang ◽  
P. K. Rajesh ◽  
Y. Y. Sun ◽  
J. Chum ◽  
...  
Keyword(s):  
Solar Eclipse ◽  
Ionospheric Response ◽  
Annular Solar Eclipse
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