Ionospheric responses to the 21 August 2017 great American solar eclipse – A multi-instrument study

Uma, G.; Brahmanandam, P. S.; Srinivasu, V.K.D.; Prasad, D. S. V. V. D.; Gowtam, V. Sai; Ram, S. Tulasi; Chu, Yen Hsyang

doi:10.1016/j.asr.2019.09.010

Cited by 7 publications

(4 citation statements)

References 37 publications

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“…3d,f,5b). This result is consistent with other ionospheric observations, such as the electron density from the Millstone Hill incoherent scatter radar (Goncharenko et al 2018) and the electron density profile from the COSMIC RO (Uma et al 2020), for the same solar eclipse event.…”

Section: Discussionsupporting

confidence: 91%

“…In order to investigate the ionospheric response to the total solar eclipse and compare with previous studies (Nayak and Yiğit 2018;Uma et al 2020), the electron density variation is calculated by subtracting the reconstructed electron densities on the previous day (20 August 2017), called as reference day afterwards, from those on the eclipse day (21 August 2017). Furthermore, the difference percentage of electron density is defined as where Ne is the electron density.…”

Section: Tomography Resultsmentioning

confidence: 99%

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Ionospheric responses on the 21 August 2017 solar eclipse by using three-dimensional GNSS tomography

Chen

Lin

Saito

et al. 2022

Earth Planets Space

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In this study, we have investigated the ionospheric responses on the August 2017 solar eclipse event by using a three-dimensional tomography algorithm with the ground-based GNSS (Global Navigation Satellite System) total electron content observations around Northern America. This three-dimensional ionospheric electron density structure from the tomography can provide us more information regarding the density variations and propagations of disturbances. Results show that the ionospheric electron density depletion triggered by the solar eclipse started from the higher ionosphere and then extended to lower altitudes. The maximum electron density depletion is around 40% compared with the previous day of solar eclipse. After around 30 min of the totality, the electron density continuously returned to the normal level. We further conduct a procedure of Fourier analyses to derive the vertical phase and group velocities of the electron density propagations. Results show that the opposite directions of the vertical phase and group velocities around 220–240 km altitude imply the energy/oscillation source by the solar eclipse. Graphical Abstract

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Section: Discussionsupporting

confidence: 91%

Section: Tomography Resultsmentioning

confidence: 99%

Ionospheric responses on the 21 August 2017 solar eclipse by using three-dimensional GNSS tomography

Chen

Lin

Saito

et al. 2022

Earth Planets Space

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“…Large attention has been paid recently to the total solar eclipse that occurred on 21 August 2017 above North America. Experimental studies reported significant changes in all ionospheric F-layer parameters and identified wave-like structures associated with the eclipse by means of both ground-based and space-based equipment (Nayak and Yiǧit, 2018;Verhulst and Stankov, 2018;Yang et al, 2018;Perry et al, 2019;Uma et al, 2020). Mrak et al (2018) pointed out that the observed wave structures may be attributed to two different sources, such as untangled wave structures emitted by the tropospheric system and solar eclipse-induced wave structures.…”

Section: Gravity Wavesmentioning

confidence: 99%

Ionosphere Influenced From Lower-Lying Atmospheric Regions

Knížová

Laštovička

Kouba

et al. 2021

Front. Astron. Space Sci.

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The ionosphere represents part of the upper atmosphere. Its variability is observed on a wide-scale temporal range from minutes, or even shorter, up to scales of the solar cycle and secular variations of solar energy input. Ionosphere behavior is predominantly determined by solar and geomagnetic forcing. However, the lower-lying atmospheric regions can contribute significantly to the resulting energy budget. The energy transfer between distant atmospheric parts happens due to atmospheric waves that propagate from their source region up to ionospheric heights. Experimental observations show the importance of the involvement of the lower atmosphere in ionospheric variability studies in order to accurately capture small-scale features of the upper atmosphere. In the Part I Coupling, we provide a brief overview of the influence of the lower atmosphere on the ionosphere and summarize the current knowledge. In the Part II Coupling Evidences Within Ionospheric Plasma—Experiments in Midlatitudes, we demonstrate experimental evidence from mid-latitudes, particularly those based on observations by instruments operated by the Institute of Atmospheric Physics, Czech Academy of Sciences. The focus will mainly be on coupling by atmospheric waves.

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“…It is, therefore, expected that the COSMIC constellation will provide a much more detailed analysis of wave structures with higher wavenumbers in the lower atmosphere [12]. The COSMIC GPS RO technique has already yielded some of the world's most notable atmospheric results in troposphere, stratosphere, and mesosphere and ionosphere altitudes, including large-scale Kelvin waves from temperature profiles [13], coupling between lower and upper ionospheres [14], sporadic E-layer observations [15], global measurements and comparisons of various ionosphere parameters [16], global ionosphere scintillation index (S4) measurements [17], comparisons of regional ionosphere irregularities between COSMIC RO technique and IRI model [18], and ionosphere response to a great American solar eclipse [19].…”

Section: Introductionmentioning

confidence: 99%

Important Atmospheric Parameters over a Indian Tropical Station Using Various Remote Sensing Instruments and a Model

Sreedevi

Brahmanandam²,

Rao

et al. 2021

AJR2P

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For the periods 01 July, 02 July, and 03 July 2018, important atmospheric parameters such as temperature, relative humidity, pressure, wind direction, and wind speed have been calculated over a tropical Indian station Gadanki (13.5°N, 79.2°E). Atmospheric Boundary Layer height (ABLH) was estimated using various analytical methods such as, vertical gradient, double gradient, and logarithmic gradient, and the results are compared with the European Centre for Medium-Range Weather Forecasts (ECMWF) ABLH data. With the COSMIC Radio Occultation (RO) technique and a regular balloon-borne radiosonde, tropopause heights and their corresponding temperatures were determined using minimum temperature criteria. Gradient and double gradient methods were more successful at capturing ABLHs than the logarithmic gradient method.

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Ionospheric responses to the 21 August 2017 great American solar eclipse – A multi-instrument study

Cited by 7 publications

References 37 publications

Ionospheric responses on the 21 August 2017 solar eclipse by using three-dimensional GNSS tomography

Ionospheric responses on the 21 August 2017 solar eclipse by using three-dimensional GNSS tomography

Ionosphere Influenced From Lower-Lying Atmospheric Regions

Important Atmospheric Parameters over a Indian Tropical Station Using Various Remote Sensing Instruments and a Model

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