Details of the Abstract
| Title of paper | Electron density monitoring for the lower ionosphere using Schumann resonance analysis of magnetotelluric data. |
| List of authors | Debopriya Das, Sudha Agrahari, Arseny Shlykov, and Alexander Saraev. |
| Affiliation(s) | Indian Institute of Technology Kharagpur, Saint Petersburg State University. |
| Summary |
Utilizing Magnetotelluric (MT) data enables the estimation of electron density within the lower ionosphere layer. This estimation provides insight into the prevailing conditions of the lower ionosphere, thereby highlighting deviations from typical trends. These deviations manifest on a daily basis within the lower ionosphere, with notable shifts potentially indicating alterations in climatic conditions, whether anthropogenic or natural in origin. The paper explores Schumann resonance (SR) variation to analyze electron density fluctuations in India's Odisha region. Orthogonal magnetic and electric field data were collected from the Mahanadi Shear Zone of Odisha region, India, in the months of April and December 2017. A fast Fourier transform is then performed on the data with a high frequency resolution of 0.015 Hz. Furthermore, spectral resolution in SR mode was achieved by averaging the power spectral magnitude of 64 data segments sampled at 64 Hz frequency with 4096 sample points. Notably, the study observed amplitude variations, particularly influenced by day-night transitions and sunset effects. Diurnal fluctuations in the first three SR modes of electromagnetic components were also observed, with maximum frequency variations noted at 0.38, 0.13, and 0.37 Hz for the initial three (first, second, and third) Schumann resonance modes, respectively. Leveraging these insights, we have calculated ionospheric electron density at a particular hour for various stations in Odisha, offering valuable insights into sudden ionospheric disturbances. These disturbances may be caused due to increase in greenhouse gas or aerosol concentrations, stemming from phenomena such as volcanic eruptions, major weather patterns, or industrial emissions. The release of radon gas from the subsurface owing to fault movement prior to an earthquake changes the aerosol concentration in the lower ionosphere. Additionally, the occurrence of Schumann resonance can contribute to the study of short-term earthquake precursors if the data is collected before an earthquake from any potential zone. |
| Session Keyword | 5.0 Monitoring: of GICs, environmental, tectonic and geomorphological hazards |
| File upload |
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