Response of D-region ionosphere due to solar flares during solar cycle 24 using VLF measurement

Singh, Abhay Kumar; Tripathi, Gaurish; Singh, Ashutosh K.

doi:10.23919/ursi-rcrs56822.2022.10118558

Cited by 1 publication

(3 citation statements)

References 6 publications

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“…Singh et al. (2022) also observed multiple C‐class solar flares, and their results indicate a decrease in h ′ of approximately 2–6 km depending on flare intensity. This range matches our observation very closely.…”

Section: Scientific Observationsmentioning

confidence: 93%

“…(2015) and Singh et al. (2022) examined the effects of solar flares on propagation paths from NWC to receiver sites in eastern India. When averaging across multiple C‐class solar flares, Selvakumaran et al.…”

Section: Scientific Observationsmentioning

confidence: 99%

“…While our model is not constrained to the two-parameter ionosphere, we do observe similar changes in the electron density profile. Both Selvakumaran et al (2015) and Singh et al (2022) examined the effects of solar flares on propagation paths from NWC to receiver sites in eastern India. When averaging across multiple C-class solar flares, Selvakumaran et al (2015) observed an average decrease in h′ of 3 km.…”

Section: July 2017 Solar Flarementioning

confidence: 99%

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Unifying VLF Transmitter and Sferic Modeling Efforts Via Tomography

Richardson,

Cohen

2023

JGR Space Physics

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We demonstrate a methodology for utilizing measurements from very low frequency (VLF, 3−30 kHz) transmitters and lightning emissions to produce 3D lower electron density maps, and apply it to multiple geophysical disturbances. The D‐region lower ionosphere (60−90 km) forms the upper boundary of the Earth‐ionosphere waveguide which allows VLF radio waves to propagate to global distances. Measurements of these signals have, in many prior studies, been used to infer path‐average electron density profiles within the D region. Historically, researchers have focused on either measurements of VLF transmitters or radio atmospherics (sferics) from lightning. In this work, we build on recently published methods for each and present a method to unify the two approaches via tomography. The output of the tomographic inversion produces maps of electron density over a large portion of the United States and Gulf of Mexico. To illustrate the benefits of this unified approach, daytime and nighttime maps are compared between a sferic‐only model and the new approach suggested here. We apply the model to characterize two geophysical disturbances: solar flares and lower ionospheric changes associated with thunderstorms.

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Section: Scientific Observationsmentioning

confidence: 93%

Section: Scientific Observationsmentioning

confidence: 99%