Earth’s lower ionosphere during partial solar eclipses according to observations near Nizhny Novgorod

Бахметьева, Н. В.; Vyakhirev, V. D.; Kalinina, E. E.; Комраков, Г. П.

doi:10.1134/s0016793217010029

Cited by 14 publications

(9 citation statements)

References 21 publications

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“…Finally, the disappearance of ionospheric D‐region during solar eclipse is in general agreement with a variety of other studies using VLF and HF radio instrumentation (e.g. Bakhmetieva et al, ; Burton & Boardman, ; Chandra et al, ; Phanikumar et al, ; Singh et al, , ). However, there are some additional remarks that need to be made on a few aspects of our experimental observations.…”

Section: Discussion Of Findingssupporting

confidence: 90%

Ionospheric Effects During the Total Solar Eclipse Over Southeast Asia‐Pacific on 9 March 2016: Part 1. Vertical Movement of Plasma Layer and Reduction in Electron Plasma Density

et al. 2020

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We report our investigation of ionospheric effects that occurred during a total solar eclipse over the Southeast Asia-Pacific region on 9 March 2016. In particular, here we examine rapid uplift of the ionospheric F-layer during the eclipse, and reductions of ionospheric plasma density in areas around the eclipse totality. This study used data from ionosondes at Biak and Guam, as well as data from a bistatic HF radio link (∼1300 km apart, cutting across the eclipse totality trajectory) between Biak and Manado. Gridded total electron content (TEC) data from the Madrigal Database were also used for a cross-comparison. The ionosonde measurements indicate an upward vertical drift velocity in the range of 21−40 m/s in the ionospheric F-region during the eclipse. Over Biak, f oF2 decreased from 10 MHz to 6 MHz (a 40% reduction) during the eclipse. Meanwhile, f oF2 over Guam during the eclipse was suppressed for a few hours; lower than the 7-day average normal level by 3 MHz. The Madrigal GPS TEC data corroborate these ionosonde measurements. Finally, data from the Biak-Manado HF radio link indicate that the D-region ionosphere had diminished substantially during the eclipse.

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Section: Discussion Of Findingssupporting

confidence: 90%

Ionospheric Effects During the Total Solar Eclipse Over Southeast Asia‐Pacific on 9 March 2016: Part 1. Vertical Movement of Plasma Layer and Reduction in Electron Plasma Density

et al. 2020

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“…Such periods are characteristic of internal gravity waves and are their manifestation in the ionosphere and the neutral atmosphere parameters. The results of long-term measurements of the parameters of the neutral component and the plasma vertical velocity in the lower ionosphere by the API technique convincingly demonstrate a significant effect of atmospheric waves, which are most intense during natural disturbances [16,17,33]. The amplitude of the waves can reach 50-100 K in…”

Section: Atmospheric Wavesmentioning

confidence: 76%

“…The API technique and methods of determination of many ionosphere parameters are presented in detail in [8]. Many results of ionosphere studies by this method are given in [16][17][18][19][20][21][22][23][24]. In this paper, we present the results of recent experiments on ionosphere studies by the API technique using the Sura heating facility.…”

Section: Methodsmentioning

confidence: 99%

“…Lidar observation, airglow imaging, measurements of the horizontal wind by meteor radar, and satellite observation allow one to determine IGW vertical and horizontal parameters from the lower atmosphere to the thermosphere [11][12][13][14][15]. Among these techniques, the method based on a scattering of high frequency radio waves by artificial periodic irregularities of the ionospheric plasma is promising [8,[16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

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Investigations of Atmospheric Waves in the Earth Lower Ionosphere by Means of the Method of the Creation of the Artificial Periodic Irregularities of the Ionospheric Plasma

et al. 2019

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We present results of the studies of internal gravity waves based on altitude-time dependences of the temperature and the density of the neutral component and the velocity of the vertical plasma motion at altitudes of the lower ionosphere (60–130 km). The vertical plasma velocity, which in the specified altitude range is equal to the velocity of the neutral component, the temperature, and the density of the neutral atmosphere are determined by the method of the resonant scattering of radio waves by artificial periodic irregularities (APIs) of the ionosphere plasma. We have developed an API technique and now we are evolving it for studying the ionosphere and the neutral atmosphere using the Sura heating facility (56.1 N; 46.1 E), Nizhny Novgorod, Russia. An advantage of the API technique is the opportunity to determine the parameters of the undisturbed natural environment under a disturbance of the ionosphere by a field of powerful high frequency radio waves. Analysis of altitude-time variations of the neutral temperature, the density, and the vertical plasma velocity allows one to estimate periods of atmospheric waves propagation. Wavelike variations with a period from 5 min to 3 h and more are clearly determined.

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“…For the lower ionosphere, several authors record time delays between eclipse and electron density variations ranging from 2 to 5 min (Bullett and Mabie, 2018;Goncharenko et al, 2018), while others have found time delays of up 20 min above 90 km and E layer (Chandra et al, 1981;Belikovich et al, 2008;Bakhmetieva et al, 2017). Furthermore, an attempt to quantify this delay in terms of the so-called "sluggishness factor" was proposed by (Appleton, 1953), which explained the range of response delays in terms of different electron densities present in the ionospheric D and E layers.…”

Section: Geomagnetic Field Variationmentioning

confidence: 99%

Analysis of Ionospheric and Geomagnetic Response to the 2020 Patagonian Solar Eclipse

Meza

Eylenstein

Natali

et al. 2021

Front. Astron. Space Sci.

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Total solar eclipses are unique opportunities to study how the ionospheric and external geomagnetic field responds to fast changes in the ionizing flux as the moon’s shadow travels through its path over the ionosphere at an average speed of 3,000 km/h. In this contribution, we describe our observing campaign in which we set up GNSS and geomagnetic stations at the city of Valcheta, Río Negro, Argentina (which was located right under the path of totality). We also describe the results obtained from the analysis of the combination of on-site data together with publicly available observations from geodetic and geomagnetic observatories. The large span in latitude of our data allowed us to analyze the different magnitudes of the drop in vertical total electron content (ΔVTEC) with varying occultation percentages. We found an expected reduction in this drop as we move away from totality path but we also detected a new increment in ΔVTEC as we got closer to Earth’s Magnetic Equator. We also compared our observations of the geomagnetic field variations with predictions that were based on the Ashour-Chapman model and we find an overall good agreement, although a ≈20 min delay with the eclipse maximum is evident beyond observing uncertainties. This suggests the presence of processes that delay the response of the lower ionosphere to the loss of the photoionization flux.

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Earth’s lower ionosphere during partial solar eclipses according to observations near Nizhny Novgorod

Cited by 14 publications

References 21 publications

Ionospheric Effects During the Total Solar Eclipse Over Southeast Asia‐Pacific on 9 March 2016: Part 1. Vertical Movement of Plasma Layer and Reduction in Electron Plasma Density

Ionospheric Effects During the Total Solar Eclipse Over Southeast Asia‐Pacific on 9 March 2016: Part 1. Vertical Movement of Plasma Layer and Reduction in Electron Plasma Density

Investigations of Atmospheric Waves in the Earth Lower Ionosphere by Means of the Method of the Creation of the Artificial Periodic Irregularities of the Ionospheric Plasma

Analysis of Ionospheric and Geomagnetic Response to the 2020 Patagonian Solar Eclipse

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