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Showing papers in "Journal of Atmospheric and Solar-Terrestrial Physics in 2021"


Journal ArticleDOI
TL;DR: This work organizes metrics into two primary groups: 1) fit performance metrics, often based on the data-model value difference; and 2) event detection metrics, which use a discrete event classification of data and model values determined by a specified threshold.

44 citations


Journal ArticleDOI
TL;DR: A review of the impact of the cold-ion and cold-electron populations in the Earth's magnetosphere is presented in this paper, where the cold populations are defined by total energy less than approximately 100 eV, i.e. in the energy range which is strongly affected by spacecraft charging and that often dominates the total plasma density.

39 citations


Journal ArticleDOI
TL;DR: In this paper, the authors analyzed thermal anomalies from MODIS-based Land Surface Temperature (LST) of three different magnitudes and shallow depth EQs in Pakistan, and investigated the thermal anomalies by the statistical approach and Artificial Neural Network (ANN) in spatial and temporal LST values within 10 days before and after the main shock as short-term precursors.

25 citations



Journal ArticleDOI
TL;DR: In this article, the authors proposed a data processing technique for a 2D array of magnetic stations that automatically recognizes eddy current structures in the polar ionosphere and evaluates their dynamic parameters, such as the density and scale of field-aligned currents, and velocity of horizontal propagation.

19 citations


Journal ArticleDOI
TL;DR: In this paper, two types of Artificial Neural Network (ANN) including Multi-Layer Perceptron (MLP) and Nonlinear Auto-Regressive with Exogenous Inputs (NARX) were employed to forecast precipitation in different regions.

19 citations


Journal ArticleDOI
TL;DR: In this article, the authors review current understanding of current sheet physics and discuss their recent observational and simulation results on thin current sheet formation, emphasizing the kinetics of thinning, multi-component ion populations, role of electron anisotropy and ion agyrotropy, and the role of the ionosphere.

19 citations


Journal ArticleDOI
TL;DR: In this paper, the authors used applied statistics to determine the spatiotemporal climatic similarities of municipalities along a longitudinal gradient from the east to the north-east of Pernambuco State, in northeastern Brazil, from 1993 to 2018, based on applied statistics.

19 citations


Journal ArticleDOI
TL;DR: In this paper, the authors present results from two three-dimensional hybrid simulations performed with a novel asynchronous code, HYPERS designed to overcome computational bottlenecks that typically arise in such multiscale simulations.

17 citations


Journal ArticleDOI
TL;DR: In this article, the mesospheric temperature and pressure altitude are produced through combining observations by the Halogen Occultation Experiment (HALOE), Sounding of the Atmosphere Using Broadband Emission Radiometry (SABER), and Solar Occultations for Ice Experiment (SOFIE) instruments.

16 citations


Journal ArticleDOI
TL;DR: In this article, the radiative and cloud microphysical effects (direct and indirect effects respectively) of the Saharan dust aerosols and the subsequent perturbations of the radiation budget over the tropical East Atlantic Ocean were investigated.

Journal ArticleDOI
TL;DR: In this paper, the suitability of various Copula's models for modeling drought events using two drought indices, i.e., Standardized Precipitation Index and standardized precipitation temperature index for different meteorological stations of Pakistan.

Journal ArticleDOI
TL;DR: In this article, the authors studied the dynamics of radiation belt electrons during a 10-day quiet period perturbed by substorm activity and preceding a high speed stream (HSS), aiming at a global description of the radiation belts in L-shell, L in [2, 6], and energy [0.1, 10] MeV.

Journal ArticleDOI
TL;DR: In this paper, the mesospheric ice layers (NLC, noctilucent clouds) in the main summer season (July) and on yearly mean values are presented for a period of 138 years (1871-2008).

Journal ArticleDOI
TL;DR: The results show that a pronounced spectral and temporal variability in the AOD during three lockdown phases is mainly due to distinct aerosol sources.

Journal ArticleDOI
TL;DR: In this paper, the dispersion properties of droplet size distribution (DSD) in continental deep cumulus clouds under the influence of lateral entrainment and mixing processes were investigated and the spectral width ( σ r ) and relative dispersion (ν) of DSD with liquid water content (LWC), droplet number concentration (Nd) and mean radius ( r m ), which decrease from their adiabatic values due to dry air mixing.

Journal ArticleDOI
TL;DR: The first review of the global Alfvenic oval is presented in this article, where the focus lies on the large-scale dynamic properties of the globally averaged AU index, substorm phases, storm phases and solar wind/IMF conditions.

Journal ArticleDOI
TL;DR: A variety of magnetospheric plasma populations have been proposed to impact solar wind-magnetosphere coupling as mentioned in this paper, including plasmaspheric plume, plasma cloak, ion plasma sheet, and dayside ion outflow.

Journal ArticleDOI
TL;DR: In this paper, the impact of sudden stratospheric warmings (SSW) on the Arctic middle atmosphere was investigated using the Sub-Millimetre Radiometer (SMR) onboard the Odin satellite, measuring NO globally since 2003.

Journal ArticleDOI
TL;DR: In this article, the authors presented the variability of occurrence frequency rates for the summer layers since 1994, showing that the occurrence of the summer dust-dominated echoes show a positive trend of about 0.32%/yr over the last twenty seven years which might be related to the observed negative mesospheric temperature trends at polar latitudes.

Journal ArticleDOI
TL;DR: In this article, the authors present the first climatology of the 12- and 24-h tides measured at heights of 80-100 km by a meteor radar over the Antarctic station of Rothera (68°S, 68°W).

Journal ArticleDOI
TL;DR: In this article, a semi-coherent ionospheric pulsing structures (SCIPS) was detected with the Millstone Hill (MH) incoherent scatter radar (ISR) and was later identified, with the addition of Global Positioning System total electron content (GPS-TEC) imaging, as a novel ionosphere phenomenon.

Journal ArticleDOI
TL;DR: In this paper, a unique simultaneous occurrence of two plasma structures using a 630.0nm all-sky airglow imager in Hanle, India is reported, which indicate that the observed structures are Medium Scale Travelling Ionospheric Disturbances (MSTIDs) of different types, namely periodic and single dark band.

Journal ArticleDOI
TL;DR: In this paper, the authors used a nearly 30-year dataset merged from the Halogen Occultation Experiment (HALOE) observations between 1991 and 2005 and the Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) data between 2002 and 2019 to study the long-term trend and solar cycle in the middle atmosphere temperature between 45°S and 45°N.

Journal ArticleDOI
TL;DR: Machine Learning technique known as Convolutional Autoencoder was employed to build Statistical Downscaling Model (SDM) emulator to evaluate the SDM performance emulating latest Rossby Centre (RCA4) RCM, which has exhibited positive correlation of 0.75.

Journal ArticleDOI
TL;DR: In this article, a neural network-based approach taking seven meteorological variables as input data was developed based on the back propagation (BP) algorithm for detecting heavy precipitation in Hong Kong.

Journal ArticleDOI
TL;DR: In this paper, the authors use the Specified Dynamics Whole Atmosphere Community Climate Model eXtended (SD-WACCM-X) to quantify how the meteorology of the underlying atmosphere impacts the thermosphere.

Journal ArticleDOI
TL;DR: In this article, the seasonal variability and vertical structure of short-period (8- and 6-h) tides observed by meteor radars at high latitudinal stations Tromso (70°N, 19°E) and Svalbard (78°N and 16°E).


Journal ArticleDOI
TL;DR: In this paper, the authors presented the development of a global three-dimensional (3-D) electron density reconstruction based on radio occultation data during 2006-2019 and neural networks.