A Statistical Study of Modulation of Electromagnetic Ion Cyclotron Waves Observed on Ground

Upadhyay, Aditi; Kakad, Bharati; Kakad, Amar; Rawat, Rahul

doi:10.1029/2022ja030340

Cited by 3 publications

(3 citation statements)

References 60 publications

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“…To some extent, this can be overcome by the use of ground based wave activity measurements. However, EMIC waves in space are both modulated and ducted when they are observed on the ground, thereby complicating associating wave activity with particle PAD observations (Upadhyay et al, 2022;Pakhotin et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

Persistent pitch angle anisotropies of relativistic electrons in the outer radiation belts

Greeley

Kanekal

Schiller

et al. 2023

Preprint

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Pitch Angle Distributions in the radiation belts are well characterized with sinnα. By tracking the exponent ‘n’, termed Pitch Angle Index, we are able to observe persistent and cross energy changes in pitch angle distributions of Van Allen radiation belt electrons using Van Allen Probes particle observations. The pitch angle distributions measurements are well fit down to a single satellite spin, and therefore can track spatially and temporally confined changes to determine connection between particles and waves. We use the Van Allen Probes data in conjunction with Geostationary Operational Environmental Satellites (GOES) spacecraft and several ground magnetometer stations from Canadian Array for Realtime Investigations of Magnetic Activity (CARISMA) and Finnish pulsation magnetometer network of Sodankylä Geophysical Observatory (SGO) to connect particles that become very anisotropic to electromagnetic ion cyclotron (EMIC) waves during a quiet period over two days, June 26 and 27, 2013. The waves and peaks in the particle PADs are both long lasting but spatially separated, suggesting that wave particle interactions in the inner magnetosphere can occur for extend periods of time and have significant impact on the global radiation belts, even during otherwise geomagnetically quiet times and when wave activity is highly localized.

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Section: Discussionmentioning

confidence: 99%

Persistent pitch angle anisotropies of relativistic electrons in the outer radiation belts

Greeley

Kanekal

Schiller

et al. 2023

Preprint

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“…The Bharati (BRT) and Shillong (SHI) stations are operated by the Indian Institute of Geomagnetism. The low resolution (64 Hz) data from the low latitude SHI station in India have been used to study ionospheric Alfven resonances (IAR) (e.g., Adhitya et al., 2022) while high resolution (256 Hz) data from the Antarctic BRT station have been used to examine finer structures of electromagnetic ion cyclotron (EMIC) waves (e.g., Kakad et al., 2018; Upadhyay et al., 2022). The Eskdalemuir (ESK) station is operated by the British Geological Survey and is dedicated to study SRs and ionospheric Alfven resonances (see e.g., Beggan & Musur, 2018; Musur & Beggan, 2019).…”

Section: Methodsmentioning

confidence: 99%

“…data from the Antarctic BRT station have been used to examine finer structures of electromagnetic ion cyclotron (EMIC) waves (e.g., Kakad et al, 2018;Upadhyay et al, 2022). The Eskdalemuir (ESK) station is operated by the British Geological Survey and is dedicated to study SRs and ionospheric Alfven resonances (see e.g., Beggan & Musur, 2018;Musur & Beggan, 2019).…”

Section: Data On Schumann Resonancesmentioning

confidence: 99%

Day‐To‐Day Quantification of Changes in Global Lightning Activity Based on Schumann Resonances

et al. 2023

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The importance of lightning has long been recognized from the point of view of climate-related phenomena. However, the detailed investigation of lightning on global scales is currently hindered by the incomplete and spatially uneven detection efficiency of ground-based global lightning detection networks and by the restricted spatio-temporal coverage of satellite observations. We are developing different methods for investigating global lightning activity based on Schumann resonance (SR) measurements. SRs are global electromagnetic resonances of the Earth-ionosphere cavity maintained by the vertical component of lightning. Since charge separation in thunderstorms is gravity-driven, charge is typically separated vertically in thunderclouds, so every lightning flash contributes to the measured SR field. This circumstance makes SR measurements very suitable for climate-related investigations. In this study, 19 days of global lightning activity in January 2019 are analyzed based on SR intensity records from 18 SR stations and the results are compared with independent lightning observations provided by ground-based (WWLLN, GLD360, and ENTLN) and satellite-based (GLM, LIS/OTD) global lightning detection. Daily average SR intensity records from different stations exhibit strong similarity in the investigated time interval. The inferred intensity of global lightning activity varies by a factor of 2-3 on the time scale of 3-5 days which we attribute to continental-scale temperature changes related to cold air outbreaks from polar regions. While our results demonstrate that the SR phenomenon is a powerful tool to investigate global lightning, it is also clear that currently available technology limits the detailed quantitative evaluation of lightning activity on continental scales. Plain Language SummaryLightning is recognized as a climate variable indicating the changing climate of the Earth. Surface temperature changes on the order of 1°C can result in a significant change in lightning frequency. Lightning activity is monitored on a global scale by satellites and by ground-based global lightning detection networks. However, the detection efficiency of these available technologies is limited which restricts the investigation of global lightning activity especially on the day-to-day time scale. In this study, we propose an alternative method to monitor day-to-day changes in global lightning activity based on Schumann resonance measurements and thus we compare SR-based observations with available global lightning monitoring techniques. We show that the overall intensity of global lightning activity can vary considerably (by a factor of 2-3) within a few days, further motivating our efforts to monitor such changes and understand BOZÓKI ET AL.

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Long-lasting Electromagnetic Ion Cyclotron wave signatures at Indian Antarctic Station, Maitri

Kakad

Upadhyay

Kakad

et al. 2023

Advances in Space Research

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A Statistical Study of Modulation of Electromagnetic Ion Cyclotron Waves Observed on Ground

Abstract: In the area of space weather, the Electromagnetic ion cyclotron (EMIC) waves have been the focus of much recent research owing to their important role in the loss of energetic charged particles in the Earth's inner magnetosphere. The EMIC waves efficiently scatter ring current ions (

Cited by 3 publications

References 60 publications

Persistent pitch angle anisotropies of relativistic electrons in the outer radiation belts

Persistent pitch angle anisotropies of relativistic electrons in the outer radiation belts

Day‐To‐Day Quantification of Changes in Global Lightning Activity Based on Schumann Resonances

Long-lasting Electromagnetic Ion Cyclotron wave signatures at Indian Antarctic Station, Maitri

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