Showing papers in "Journal of Atmospheric and Solar-Terrestrial Physics in 2017"

TL;DR: In this paper, the accuracy and performance of three soft computing techniques (i.e., adaptive neuro-fuzzy inference system (ANFIS), artificial neural network (ANN) and support vector machine (SVM)) were assessed for predicting daily horizontal global solar radiation from measured meteorological variables in the Yucatan Peninsula, Mexico.

TL;DR: In this article, the variation characteristics of air temperature and precipitation in the Yangtze River Basin (YRB), China during 1960-2015 were analyzed using a linear regression (LR) analysis, a Mann-Kendall (MK) test with Sen's slope estimator and Sen's innovative trend analysis (ITA).

TL;DR: In this paper, the role of ozone in mesospheric temperatures and E-region ionosphere has been confirmed and quantified, and the agreement between observational and simulated trends in the thermospheric density, supported by satellite observations of radiative cooling was reached.

TL;DR: In this article, the authors present a new method to approach additionally to the presence of sporadic E also its intensity which is closely related to the blanketing frequency ( f b E s ) provided by ionosondes.

TL;DR: In this paper, a study of horizontal winds in the mesosphere and lower thermosphere (MLT) during the boreal winters of 2009-2010 and 2012-2013 produced with a new high-altitude numerical weather prediction (NWP) system is presented.

TL;DR: In this paper, a study comparing coronal flux ropes inferred from eruption data with their interplanetary counterparts constructed from in situ data was conducted, and it was found that the CME magnetic field in the corona is significantly higher than the ambient magnetic field at a given heliocentric distance.

TL;DR: In this article, the performance of rain attenuation and rainfall data for three years between 2013-2015, in 3.2 km experimental link of 38 GHz and 0.1 km link at 75 GHz was analyzed.

TL;DR: A review of the recent developments in the understanding of the equatorial plasma fountain (EPF) and equatorial ionization anomaly (EIA) under quiet and active conditions is presented in this paper.

TL;DR: In this article, the authors used regression analysis to correlate the diffuse fraction (K d ) with clearness index (K t ) and relative sunshine period (S S o ) together.

TL;DR: In this article, a modified version of a theoretical model for the E region (MIRE) for a Brazilian region: Cachoeira Paulista, a low latitude station is presented.

TL;DR: In this paper, the authors derived the models to forecast the daily global solar radiation on horizontal plane for the Eastern Anatolia Region (EAR) of Turkey, covering thirteen provinces, for the period of 1991-2005.

TL;DR: In this paper, the mesoscale magnetic field structure of the solar wind as it approaches Earth is visualized in a Y-Z (GSE) plane upstream of the Earth using a modified Voronoi diagram generated to represent some of the statistical properties.

TL;DR: In this article, a Monte Carlo approach is used to investigate the evolution of the Sun's surface field during the decay phase of cycle 24, and the expected value for the dipole moment around 2020 is 1.76 ± 0.68 G.

TL;DR: In this article, the authors examined the role of planetary wave, gravity wave and tidal forcing on the initiation of the descent in the mesosphere-lower thermosphere (MLT) and its continuation throughout mesosphere and stratosphere, as well as the impact of model eddy diffusion.

TL;DR: In this paper, the authors used a laser-based disdrometer at two different locations [Kadapa (14.47°N, 78.82°E) and Gadanki (13.5°N and 79.2°E)] in semi-arid region of southern India to investigate the raindrop size distribution characteristics in before landfall (BLF) and after landfall (ALF) induced precipitations.

TL;DR: In this article, a range of instability types that closely resemble instabilities and turbulence seen in PMC imaging and by ground-based and in-situ instruments at all times and altitudes are analyzed.

TL;DR: In this paper, two Rayleigh lidars were employed at a southern-hemisphere mid-latitude site in New Zealand (45°S) and a northern hemispaces high-latitudes site in Finland (67°N) in order to observe gravity waves between 30 and 85 km altitude under wintertime conditions.

TL;DR: In this article, the morphological characteristics of ionospheric disturbances induced by cyclones in different continents were investigated using the global ionosphere map supplied by the Center for Orbit Determination in Europe (CODE), International Reference Ionosphere Model (IRI) 2012, and Wallops Island ionosonde station data.

TL;DR: In this paper, the authors used Rayleigh/Mie/Raman-lidar at the ALOMAR research facility in Northern Norway (69°N, 16°E) since 1994.

TL;DR: The outer part of the ring current is referred to as the cut ring current (CRC) as discussed by the authors, which is the main source of geomagnetic activity in the Dst/SYM-H variations.

TL;DR: In this article, the authors studied the influence of altitude on lightning activity on the Colombian mountains, where the altitude varies from 0 to more than 5000mmsl, based on VLF/LF detection data and using a 2012-2013 dataset.

TL;DR: In this paper, a systematic search for TGFs in the BeppoSAX data archive was carried out, with a sample of 12 TGF candidates and a peculiar event, whose light curve characteristics may represent the signature of a mirrored Terrestrial Electron Beam (TEB).

TL;DR: In this paper, an atmosphere-ionosphere coupled model was used to investigate the excitation source and temporal variations in non-migrating tides in the mesosphere and lower thermosphere, and it was shown that upward propagation of the diurnal tide excited in the troposphere is sensitive to the zonal mean zonal wind in the stratosphere and mesosphere.

TL;DR: Comparisons of different methods for estimating daily global solar irradiation showed that: SVM technique has better performance in estimating H than A-P and ANN models.

TL;DR: In this paper, the authors focus on the rush-to-the-poles (RTTP) phenomenon in coronal green line emission and find a correlation between the rate of the RTTP and the time delay until the maximum of the next solar cycle.

TL;DR: In this article, a modified 2-D Morlet wavelet transform is proposed to identify and extract 2D quasi-monochromatic wave packets and then derive their wave properties including wave periods, wavelengths, phase speeds, and time/space spans.

TL;DR: In this paper, the three dimensional (3D) ray tracing technique based on Eikonal equations and ERA-I data were used to perform the reconstruction the signal path, Iranian Permanent GPS Network (IPGN) measurements are used to calculate slant wet delays and the LSQR regularization technique is used to obtain a regularized tomographic solution for tropospheric water vapor.

TL;DR: In this article, a modified version of a theoretical model for the E region (MIRE), which computes the densities of the metallic ions (Fe + and Mg + ) and the density of the main molecular ions (NO +, O 2 +, N 2 + ) by solving the continuity and momentum equations for each one of them, is presented.

TL;DR: In this article, the main ingredients for getting X ray class flares and large interplanetary Corona mass ejections are presented such as the existence of magnetic free energy, magnetic helicity, twist and stress in active regions.

TL;DR: In this article, the authors evaluated the performance of the Advanced Research Weather Research and Forecasting (WRF-ARW) model for prediction of land-falling Bay of Bengal (BoB) tropical cyclones (TCs).