scholarly journals GPS‐TEC Observation of Gravity Waves Generated in the Ionosphere During 21 August 2017 Total Solar Eclipse

2018 ◽  
Vol 123 (1) ◽  
pp. 725-738 ◽  
Author(s):  
Chinmaya Nayak ◽  
Erdal Yiğit
Keyword(s):  
Gravity Waves ◽  
Solar Eclipse ◽  
Total Solar Eclipse ◽  
Gps Tec

scholarly journals Evidence of gravity waves into the atmosphere during the March 2006 total solar eclipse

2007 ◽  
Vol 7 (18) ◽  
pp. 4943-4951 ◽  
Author(s):  
C. S. Zerefos ◽  
E. Gerasopoulos ◽  
I. Tsagouri ◽  
B. E. Psiloglou ◽  
A. Belehaki ◽  
...  
Keyword(s):  
Relative Humidity ◽  
Electron Density ◽  
Gravity Waves ◽  
Solar Eclipse ◽  
Stratospheric Ozone ◽  
Thermal Fluctuations ◽  
Ozone Layer ◽  
Total Solar Eclipse ◽  
Electron Content ◽  
Total Electron

Abstract. This study aims at providing experimental evidence, to support the hypothesis according to which the movement of the moon's shadow sweeping the ozone layer at supersonic speed, during a solar eclipse, creates gravity waves in the atmosphere. An experiment was conducted to study eclipse induced thermal fluctuations in the ozone layer (via measurements of total ozone column, ozone photolysis rates and UV irradiance), the ionosphere (Ionosonde Total Electron Content – ITEC, peak electron density height – hmF2), and the troposphere (temperature, relative humidity), before, during and after the total solar eclipse of 29 March 2006. We found the existence of eclipse induced dominant oscillations in the parameters related to the ozone layer and the ionosphere, with periods ranging between 30–40 min. Cross-spectrum analyses resulted to statistically significant square coherences between the observed oscillations, strengthening thermal stratospheric ozone forcing as the main mechanism for GWs. Additional support for a source below the ionosphere was provided by the amplitude of the oscillations in the ionospheric electron density, which increased upwards from 160 to 220 km height. Even though similar oscillations were shown in surface temperature and relative humidity data, no clear evidence for tropospheric influence could be derived from this study, due to the modest amplitude of these waves and the manifold rationale inside the boundary layer.

scholarly journals Atmospheric Gravity Waves Observed in the Nightglow Following the 21 August 2017 Total Solar Eclipse

2020 ◽  
Vol 47 (17) ◽  
Author(s):  
I. Paulino ◽  
C. A. O. B. Figueiredo ◽  
F. S. Rodrigues ◽  
R. A. Buriti ◽  
C. M. Wrasse ◽  
...  
Keyword(s):  
Gravity Waves ◽  
Solar Eclipse ◽  
Total Solar Eclipse ◽  
Atmospheric Gravity Waves ◽  
Atmospheric Gravity

scholarly journals Response of the equatorial ionosphere to the total solar eclipse of 22 July 2009 and annular eclipse of 15 January 2010 as observed from a network of stations situated in the Indian longitude sector

2011 ◽  
Vol 29 (10) ◽  
pp. 1955-1965 ◽  
Author(s):  
A. Paul ◽  
T. Das ◽  
S. Ray ◽  
A. Das ◽  
D. Bhowmick ◽  
...  
Keyword(s):  
Solar Eclipse ◽  
Equatorial Ionosphere ◽  
Total Solar Eclipse ◽  
Solar Disc ◽  
Dual Frequency ◽  
Gps Tec ◽  
Solar Eclipses

Abstract. Dual-frequency GPS TEC monitors have been used to study the response of the ionosphere to the solar eclipses of 22 July 2009 and 15 January 2010. The receivers were located at three stations, Calcutta, Kharagpur and Baharampore which are situated outside the umbra zone in the Indian longitude sector with each baseline being ~200 km. Effects of obscuration of the solar disc were noted in the ambient TEC recorded at the three stations. A series of depletions in TEC along the track of a GPS satellite and associated wave-like structures were identified on some GPS links during both the eclipses.

scholarly journals Evidence of gravity waves into the atmosphere during the March 2006 total solar eclipse

2007 ◽  
Vol 7 (3) ◽  
pp. 7603-7624 ◽  
Author(s):  
C. S. Zerefos ◽  
E. Gerasopoulos ◽  
I. Tsagouri ◽  
B. Psiloglou ◽  
A. Belehaki ◽  
...  
Keyword(s):  
Electron Density ◽  
Gravity Waves ◽  
Solar Eclipse ◽  
Ozone Layer ◽  
Total Solar Eclipse ◽  
Electron Content ◽  
Supersonic Speed ◽  
Ionospheric Electron Density ◽  
Total Electron ◽  
Phase Spectra

Abstract. This study aims at testing the hypothesis according to which the movement of the moon's shadow sweeping the ozone layer at supersonic speed during a solar eclipse creates gravity waves in the atmosphere. An experiment was conducted to study fluctuations of the ozone layer, the Ionosonde Total Electron Content (ITEC) and the peak electron density height (hmF2) in the ionosphere, as well as at a number of other parameters before, during and after the total solar eclipse. We found the existence of dominant oscillations with periods ranging between 30–40 min in most of the parameters. Cross-spectrum analyses between total ozone and various atmospheric parameters resulted to statistically significant square coherences between the observed oscillations, while the respective phase spectra show that the perturbation originates in the stratosphere and reaches the various layers at speeds around 20 km min−1. Additional evidence supporting these findings was provided by the amplitude of the oscillations in the ionospheric electron density, which increased upwards from 160 to 220 km height.

scholarly journals GPS-TEC observations over Nepal during the Total Solar Eclipse on 22 July 2009

2021 ◽  
Vol 7 (1) ◽  
pp. 54-59
Author(s):  
A. N. Shrestha ◽  
Y. Migoya-Orue
Keyword(s):  
Global Positioning System ◽  
Solar Eclipse ◽  
Total Solar Eclipse ◽  
Electron Content ◽  
Positioning System ◽  
Total Electron ◽  
Ionospheric Response ◽  
Gps Tec ◽  
Global Positioning ◽  
Geographical Locations

This paper explores the ionospheric response in terms of Total Electron Content (TEC) during the 22 July 2009 Total Solar Eclipse. Using the data stored at Biratnagar (BRN2), Ramite (RMTE), Dhangadhi (DNGD), Nepalganj (NPGJ), and Taplejung (TPLJ) Global Positioning System (GPS) stations, the ionospheric activity was investigated through changes in TEC. Our research is based on GPS-TEC measurements from a widely dispersed GPS network across various geographical locations in Nepal, taking place on July 17-21 as a pre-event, July 22 as the main event, and July 23-27 as a post-event. The analysis reveals that the reduction in the TEC level is proportional to the magnitude of the total solar eclipse. The variation of the TEC depends on latitude as well as longitude. We found that TEC depletion was up to 5% from pre-event to main-event and up to 30% from main-event to post-event during the totality of the eclipse. The eclipse was accompanied by the 10-hour geomagnetic storm in Nepal, which was the explanation for the TEC upgrade to 50% on the main event day from pre-event and decreased by 25% from main-event to post-event. The result obtained in this work demonstrates the influence of the eclipse/storm on the variation of TEC.

scholarly journals Atmospheric gravity waves observed in the nightglow following the 21 August 2017 total solar eclipse}

2020 ◽  
Author(s):  
Igo Paulino ◽  
Cosme A. O. B. Figueiredo ◽  
Fabiano Rodrigues ◽  
Ricardo A. Buriti ◽  
Cristiano M. Wrasse ◽  
...  
Keyword(s):  
Gravity Waves ◽  
Solar Eclipse ◽  
Total Solar Eclipse ◽  
Atmospheric Gravity Waves ◽  
Atmospheric Gravity

22 July 2009 total solar eclipse induced gravity waves in ionosphere as inferred from GPS observations over EIA

2016 ◽  
Vol 58 (9) ◽  
pp. 1755-1762 ◽  
Author(s):  
K. Vijay Kumar ◽  
Ajeet K. Maurya ◽  
Sanjay Kumar ◽  
Rajesh Singh
Keyword(s):  
Gravity Waves ◽  
Solar Eclipse ◽  
Total Solar Eclipse ◽  
Induced Gravity ◽  
Gps Observations

scholarly journals Atmospheric Gravity Wave Production for the Australian Total Solar Eclipse of 23 October 1976

1979 ◽  
Vol 32 (3) ◽  
pp. 287
Author(s):  
SM Ball
Keyword(s):  
Gravity Wave ◽  
Western Australia ◽  
Gravity Waves ◽  
Solar Eclipse ◽  
Internal Gravity Waves ◽  
Total Solar Eclipse ◽  
Atmospheric Gravity Wave ◽  
Atmospheric Gravity

Calculations are presented which suggest that internal gravity waves generated by the 23 October 1976 total solar eclipse would have come to a focus in a region well north of Australia, and also in Antarctica. No evidence is found for a focus in Western Australia, as suggested by Beer et al. (1976).

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