scholarly journals Enhancement of Electron Density in the Ionospheric F 2 Layer Near the First Contact of the Total Solar Eclipse on 21 August 2017

2022 ◽  
Vol 9 (1) ◽  
Author(s):  
Zhengyuan Tian ◽  
Yiyi Sui ◽  
Shengting Zhu ◽  
Yang‐Yi Sun
Keyword(s):  
Electron Density ◽  
Solar Eclipse ◽  
Total Solar Eclipse ◽  
First Contact

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 Mapping prominence plasma parameters from eclipse observations

2013 ◽  
Vol 8 (S300) ◽  
pp. 420-421
Author(s):  
Sonja Jejčič ◽  
Petr Heinzel ◽  
Maciej Zapiór ◽  
Miloslav Druckmüller ◽  
Stanislav Gunár ◽  
...  
Keyword(s):  
Visible Light ◽  
Electron Density ◽  
Solar Eclipse ◽  
Light Emission ◽  
Total Solar Eclipse ◽  
Quiescent Prominence ◽  
Plasma Parameters ◽  
Eclipse Observations ◽  
First Time ◽  
Visible Light Emission

AbstractUsing the eclipse observations, we construct the maps of quiescent prominence temperatures, electron densities, pressures and geometrical thicknesses. For this we use the RGB signal of prominence visible-light emission detected during the total solar eclipse on August 1, 2008 in Mongolia, and quasi-simultaneous Hα spectra taken at Ondřejov observatory. The method of disentangling the electron density and effective geometrical thickness was described by Jejčič & Heinzel (2009) and is used here for the first time to analyse the spatial variations of various prominence parameters.

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 850 μm Observations of the 11 July 1991 Total Solar Eclipse

1994 ◽  
Vol 154 ◽  
pp. 161-166
Author(s):  
M. W. Ewell ◽  
H. Zirin ◽  
J. B. Jensen ◽  
T. S. Bastian
Keyword(s):  
Electron Density ◽  
Solar Eclipse ◽  
Scale Height ◽  
Total Solar Eclipse ◽  
Single Electron ◽  
Density Scale

We present observations of the 11 July 1991 total solar eclipse made from the Caltech Submillimeter Observatory. The 850 μm limb is extended 3380±140 km above the visible limb, and there is a 10% brightening at the extreme limb. The measured limb height agrees with previous work at shorter and longer wavelengths. The run of limb heights with wavelength is well fit by a single electron density scale height. We argue that there is no need to invoke spicule geometry to explain the observations.

Wave Steepening in Ionospheric Total Electron Density due to the 21 August 2017 Total Solar Eclipse

2021 ◽  
Vol 126 (3) ◽  
Author(s):  
Yang‐Yi Sun ◽  
Mitchell M. Shen ◽  
Yu‐Lin Tsai ◽  
Chi‐Yen Lin ◽  
Min‐Yang Chou ◽  
...  
Keyword(s):  
Electron Density ◽  
Solar Eclipse ◽  
Total Solar Eclipse ◽  
Total Electron Density ◽  
Total Electron

scholarly journals Observation of the prominence cavity region using slitless eclipse flash spectra and space borne EUV filtergrams

2013 ◽  
Vol 8 (S300) ◽  
pp. 151-154
Author(s):  
Cyrille Bazin ◽  
Serge Koutchmy ◽  
Philippe Lamy ◽  
Ehsan Tavabi
Keyword(s):  
Electron Density ◽  
Plasma Density ◽  
Solar Eclipse ◽  
Intensity Ratio ◽  
Radial Direction ◽  
Hydrostatic Equilibrium ◽  
Total Solar Eclipse ◽  
First Time ◽  
The Continuum

AbstractWe used total solar eclipse free of parasitic light for studying the prominence to corona interface, and the corresponding cavity in the context of the coronal physics. We analysed the visible continuum between the prominences to directly look at the electron density. We demonstrate some enhanced heating in the cavity region. Some similarities with the interface regions are shown: the photosphere to the chromosphere and the prominence to the corona interface. The optically thin neutral Helium at 4713 Å and the singly ionized Helium 4686 Å Paschen α lines are considered. We summed 80 slitless visible eclipse flash spectra that we compare with simultaneously obtained EUV SWAP/Proba2 174 Å images of ESA and AIA/SDO 171Å 193 Å 304 Å and 131 Å filtergrams. Intensity profiles in a radial direction are studied. We deduce the variation of the intensity ratio I(He I 4713) / I(He II 4686). Discussion: the temperature rises at the edge of the prominences. We evaluate for the first time with spectrophotometric accuracy the continuum modulations in prominence spectra. W-L intensity deficits are observed near the prominence boundaries in both eclipse spectra and in EUV images, confirming that the prominence -cavity regions correspond to a relative depression of plasma density of the surrounding corona. Conclusion: we demonstrate some enhanced heating occurring in these regions assuming hydrostatic equilibrium.

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