Response of the lower equatorial ionosphere to strong tropospheric disturbances

Vanina-Dart, L. B.; Pokrovskaya, I. V.; Шарков, Е. А.

doi:10.1134/s001679320802014x

Cited by 12 publications

(3 citation statements)

References 3 publications

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“…The change in electron density in Table 2 due to TC is calculated at the daytime VLF reflection height of 75 km and nighttime 90 km. Vanina-Dart et al [2008] analyzed changes in the vertical profiles of the electron concentration during two TCs over the northern Indian Ocean using rocket sounding of the D region at Thumba rocket site (8°N, 77°E), India. They found a significant decrease (by a factor of 2-4) in the electron concentration at altitudes of 60-80 km and as a result increase in D region base height by several kilometers (not more than 5 km) over normal daytime values.…”

Section: Estimation Of the Lower Ionospheric Changesmentioning

confidence: 99%

Perturbations to the lower ionosphere by tropical cyclone Evan in the South Pacific Region

et al. 2017

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Very low frequency (VLF) electromagnetic signals from navigational transmitters propagate worldwide in the Earth‐ionosphere waveguide formed by the Earth and the electrically conducting lower ionosphere. Changes in the signal properties are signatures of variations in the conductivity of the reflecting boundary of the lower ionosphere which is located in the mesosphere and lower thermosphere, and their analysis is, therefore, a way to study processes in these remote regions. Here we present a study on amplitude perturbations of local origin on the VLF transmitter signals (NPM, NLK, NAA, and JJI) observed during tropical cyclone (TC) Evan, 9–16 December 2012 when TC was in the proximity of the transmitter‐receiver links. We observed a maximum amplitude perturbation of 5.7 dB on JJI transmitter during 16 December event. From Long Wave Propagation Capability model applied to three selected events we estimate a maximum decrease in the nighttime D region reference height (H′) by ~5.2 km (13 December, NPM) and maximum increase in the daytime D region H′ by 6.1 km and 7.5 km (14 and 16 December, JJI). The results suggest that the TC caused the neutral densities of the mesosphere and lower thermosphere to lift and sink (bringing the lower ionosphere with it), an effect that may be mediated by gravity waves generated by the TC. The perturbations were observed before the storm was classified as a TC, at a time when it was a tropical depression, suggesting the broader conclusion that severe convective storms, in general, perturb the mesosphere and the stratosphere through which the perturbations propagate.

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Section: Estimation Of the Lower Ionospheric Changesmentioning

confidence: 99%

Perturbations to the lower ionosphere by tropical cyclone Evan in the South Pacific Region

et al. 2017

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“…Many observations showed that the lower ionosphere is more sensitive to meteorological actions like TCs. During the active phase of a TC, Vanina‐Dart et al [] experimentally registered a decrease in electron concentration in the D region (maximal at altitudes of 71 ± 3 km) at the distance of about 1000 km (in the horizontal projection) from the nucleus of a TC. Ejections of charged and neutral particles from the cyclone zone influence the overlying ionospheric structures through the redistribution of minor constituents, for example, ozone [ Perevalova and Ishin , ; Vanina‐Dart et al , ].…”

Section: Introductionmentioning

confidence: 99%

“…During the active phase of a TC, Vanina‐Dart et al [] experimentally registered a decrease in electron concentration in the D region (maximal at altitudes of 71 ± 3 km) at the distance of about 1000 km (in the horizontal projection) from the nucleus of a TC. Ejections of charged and neutral particles from the cyclone zone influence the overlying ionospheric structures through the redistribution of minor constituents, for example, ozone [ Perevalova and Ishin , ; Vanina‐Dart et al , ]. TC has a specific effect on ionospheric f o F 2 which (within the effective zone of TC) increases and reaches maximum before landing [ Bauer ,1958] and long decreases about a day after landing of a TC [ Liu et al , ; Mao et al , ].…”

Section: Introductionmentioning

confidence: 99%

Tropical cyclone effects on the equatorial ionosphere: First result from the Indian sector

et al. 2016

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Ionospheric response to the effects of tropical cyclone (TC) “Mahasen” in 2013 and Hudhud in 2014 is studied on the equatorial ionosphere over the Indian sector for the first time using Global Positioning System‐derived total electron content (TEC) data. We observed an anomalous decrease of 3.8 TEC unit (1 TECU = 1016 el m−2) in vertical TEC (VTEC) value from the monthly mean for TC Mahasen and 2.1 TECU for TC Hudhud on the day of the landfall. We have also observed similar VTEC depletion of 1.5, 1.9, and 2.1 TECU for three different receivers on the landfall day for TC Vongfong over Japan. This anomalous decrease is observed over a wide zone around the trajectory of the cyclone during the active cyclonic storm stage. This observed anomaly might be the result of combined effect of TC‐inspired gravity waves, ejection of neutral particles from the terminator of a TC, and lightning electric fields which redistribute the chemical constituents of the ionosphere by increasing the number of neutral particles at different ionospheric heights, thus decreasing the TEC over the satellite‐receiver path.

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Ionospheric response during Tropical Cyclones - A Brief Review on Amphan and Nisarga

Ayyagari

Datta

Das

et al. 2023

Advances in Space Research

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Response of the lower equatorial ionosphere to strong tropospheric disturbances

Cited by 12 publications

References 3 publications

Perturbations to the lower ionosphere by tropical cyclone Evan in the South Pacific Region

Perturbations to the lower ionosphere by tropical cyclone Evan in the South Pacific Region

Tropical cyclone effects on the equatorial ionosphere: First result from the Indian sector

Ionospheric response during Tropical Cyclones - A Brief Review on Amphan and Nisarga

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