Asymmetric Distributions of Auroral Kilometric Radiation in Earth's Northern and Southern Hemispheres Observed by the Arase Satellite

Xiao, Fuliang; Tang, Jiawen; Zhang, Sai; Zhou, Qinghua; Liu, Si; Yang, He; Yang, Qiwu; Kasahara, Yoshiya; Miyoshi, Yoshizumi; Kumamoto, Atsushi; Nakamura, Yu; Tsuchiya, F.; Shinohara, I.; Nakamura, Satoko

doi:10.1029/2022gl099571

Cited by 7 publications

(5 citation statements)

References 72 publications

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“…1. From the figure, it can be seen that the asymmetric Laplace distribution is a skewed distribution with sharp peaks and thick tails, and the shape of the skewness is closely related to its quantile  [24][25][26]. In addition, the form of its distribution is quite different from the normal distribution, which shows that we also illustrate the difference between quantile regression and mean regression from the point of view of likelihood.…”

Section: Bayesian Hierarchical Quantile Regressionmentioning

confidence: 84%

Economic Policy Uncertainty, Accounting Robustness and Commercial Credit Supply - A Big Data Analysis Based on Accounts Receivable

Guo,

Guo

2023

Applied Mathematics and Nonlinear Sciences

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In this paper, a two-dimensional panel data model of economic policy uncertainty is investigated based on the individual fixed effects of panel quantile regression, and a nonparametric panel model with individual fixed effects is established. The unfolding of nonparametric penalized spline and the introduction of Bayesian in stratified quantile are utilized to construct regression models applicable to accounting robustness, respectively. In the empirical study, the economic policy uncertainty index, accounting robustness and commercial credit supply are measured respectively. The annual data of China’s Shenzhen and Shanghai A-share listed companies during the period from 2012 to 2021 were selected as the research basis, and Bayesian quantile regression was made on the basis of correlation analysis. The coefficient of commercial credit supply is found to be -0.0821, and the variable RD1 is negatively correlated with economic policy uncertainty. This regression result confirms hypothesis H1 of this paper, suggesting that private firms invest less in innovation when economic policy uncertainty is higher. In the test of economic policy uncertainty by type, the regression coefficients of RD2, EPU, and SIZE are negative, respectively -0.0368, −0.2124, and -0.1458, which indicates that fiscal policy, monetary policy, and exchange rate and capital account policy uncertainty are negatively correlated with the supply of business credit to enterprises. Based on this correlation, this study provides guidance for the development of business credit for enterprises.

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Section: Bayesian Hierarchical Quantile Regressionmentioning

confidence: 84%

Economic Policy Uncertainty, Accounting Robustness and Commercial Credit Supply - A Big Data Analysis Based on Accounts Receivable

Guo,

Guo

2023

Applied Mathematics and Nonlinear Sciences

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“…Recently, Zhang et al (2021) have presented a concise model for the field-aligned distribution of R-X mode amplitude in the region of L = 3.0-6.2 and Magnetic Latitude (MLAT) = 0-± 40°. Based on observations from spacecrafts, some works have found the annual and seasonal periodic variations of R-X mode (Green et al, 2004;Kumamoto et al, 2003;Kumamoto & Oya, 1998;Mogilevsky et al, 2005;Xiao et al, 2022). Recently, Kumamoto et al (2018) have reported an AKR event with R-X and L-O modes simultaneously using the data from Arase satellite.…”

Section: Introductionmentioning

confidence: 99%

Direct Observation of L‐X Mode of Auroral Kilometric Radiation in the Lower Latitude Magnetosphere by the Arase Satellite

Zhang,

Yin,

Yang

et al. 2024

Geophysical Research Letters

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Previous studies have shown that auroral kilometric radiation (AKR) can play an important role in the magnetosphere‐atmosphere coupling and has the right‐handed extraordinary (R‐X), left‐handed ordinary (L‐O) and left‐handed extraordinary (L‐X) modes. However, the L‐X mode has not been directly observed in the lower latitude magnetosphere yet, probably because of its very limited frequency range. Here, using observations of the Arase satellite on 6 September 2018, we present an AKR event with two distinct bands (8–20 and 300–1000 kHz) around the location: L = 8 and latitude = −37°. The low (high) band is identified as the L‐X (R‐X) mode based on the polarization and frequency ranges. Simulations of 3‐D ray tracing show that most of ray paths with 14 (11 and 18) kHz pass (miss) the location of Arase, basically consistent with observations. Our study provides direct evidence that the L‐X mode can propagate from high latitudes downward to lower latitudes.

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“…Zhang et al (2021) have constructed a concise empirical formula for the field-aligned distribution of AKR based on Arase satellite and Van Allen Probes. Recently, statistical results have presented the asymmetric distributions of AKR based on observations of the Arase satellite (Xiao et al 2022). Previous numerous works have emphasized the importance of the interplanetary magnetic field (IMF) to the magnetosphere (Han et al 2017(Han et al , 2018Hu et al 2021).…”

Section: Introductionmentioning

confidence: 99%

Annual and Seasonal Occurrence Pattern of Auroral Kilometric Radiation Associated with the Interplanetary Magnetic Field*

Li,

Zhang,

Xiao

et al. 2024

ApJL

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Auroral kilometric radiation (AKR) is a widely existing strong radio emission from the Earth’s magnetosphere and is generated by suprathermal (1–10 keV) electrons in the polar cavity. Previous works have demonstrated that AKR can contribute to the coupling of the magnetosphere–ionosphere–atmosphere, but its relation to the interplanetary magnetic field (IMF) has not been studied so far. Here, we examine the data of Van Allen Probes and identify a total of 5000 AKR events from 2012 October to 2019 July. Most AKR events (4282) correspond to the dominant parallel component B ∥ ( = ( B x ) 2 + ( B y ) 2 ) of IMF. There are the most (1391) events in 2018 (the solar minimum year) and the least (258) events in 2014 (the solar maximum year), corresponding to more (less) occurrences for the longer duration (> 30 minutes) of southward IMF (B z < 0) in 2018 (2014). In the Earth’s Northern Hemisphere, there are the most (865) events in the autumn (August–October), corresponding to dominant B x < 0. In the Earth’s Southern Hemisphere, there are the most (830) events in the autumn (February–April), corresponding to dominant B x > 0. The probable reason for the above results is that the longer duration of B z < 0 can yield the longer magnetic reconnection, and the dominant B x < 0 (B x > 0) is favorable for the single-lobe magnetic reconnection in the northern (southern) hemisphere, allowing more suprathermal electrons into the polar source cavity and generating more AKRs. These current results suggest that IMF is very important for the occurrence of AKR and can be widely applied to similar auroral radio emissions in other magnetized planets of the solar system.

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Asymmetric Distributions of Auroral Kilometric Radiation in Earth's Northern and Southern Hemispheres Observed by the Arase Satellite

Cited by 7 publications

References 72 publications

Economic Policy Uncertainty, Accounting Robustness and Commercial Credit Supply - A Big Data Analysis Based on Accounts Receivable

Economic Policy Uncertainty, Accounting Robustness and Commercial Credit Supply - A Big Data Analysis Based on Accounts Receivable

Direct Observation of L‐X Mode of Auroral Kilometric Radiation in the Lower Latitude Magnetosphere by the Arase Satellite

Annual and Seasonal Occurrence Pattern of Auroral Kilometric Radiation Associated with the Interplanetary Magnetic Field*

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