This study presents a consistent method to the inherently imbalanced problem of predicting solar energetic particle (SEP) events, using variety datasets that include flares, coronal mass ejections (CMEs), and radio bursts. We applied several machine learning (ML) methods, including Random Forests (RF), Decision Trees (dtree), Support Vector Machines (SVM) with both linear (linSVM) nonlinear (svm) kernels. To assess model performance, we used standard metrics such as Probability Detection...

Abstract In this context, we utilized a simplified representation of the curved cylinder flux tube to approximate helical structure prominence. By considering bright features as indicators magnetic field, measured average twist angle prominence legs. To gather necessary data, obtained image data with wavelength 171 Å from Solar Dynamic Observatory (SDO)/Advanced Imaging Assembly (AIA) archive. We employed some IDL routines within SolarSoft (SSW) package determine rope’s total for confined...

Based on non-local thermodynamical equilibrium (NLTE) calculations, the solar neodymium (Nd) content was found based a model atom of singly ionized (Nd ii) containing 153 energy levels and 42 line transitions plus ground state Nd iii. Here, we re-derive abundance using photosphere Holweger & Müller.We succeed in selecting good sample list, relying 20 ii lines together with most accurate transition probabilities measured experimentally available observational data. With damping parameters...

We analyze penumbral fine structure using high-resolution spectropolarimetric data obtained by the Solar Optical Telescope on board Hinode satellite. The spatial correlation between net circular polarization (NCP) and Evershed flow is investigated in detail. Here we obtain that negative NCP structures are correlated with channels limb-side penumbra, or depressions of positive associated disk center-side penumbra for a negative-polarity sunspot NOAA 10923. dominant essentially attributed to...

ABSTRACT Determinations of the solar abundance praseodymium (Pr) depend critically on local thermodynamical equilibrium (LTE) and non-local (NLTE) techniques beyond capabilities a classical one-dimensional model atmosphere. Here, in this analysis, we adopt an atomic atom Pr consisting 105 energy levels 14 bound–bound transitions singly ionized (Pr ii) ground state iii continuum limit. We briefly analyse taking atmospheres Holweger & Müller (1974, Solar Physics, 39, 19) with measured...

Abstract We investigate high-resolution observations with the spectropolarimeter (SP) aboard Hinode satellite of Solar Optical Telescope (SOT) a positive polarity sunspot an active region (AR) (NOAA 12546). present case study for properties thermal, magnetic field, and plasma flows as function optical depth from inversion observed Stokes profiles, covering wide field view area. Particular attention is paid to examination net circular polarization (NCP) area asymmetry spectral lines in...

Abstract We analyze the magnetism of quiet Sun internetwork (IN) using high-spatial-resolution data obtained by spectropolarimeter (SP) Solar Optical Telescope aboard Hinode satellite near disk center Sun. The SP were inverted Stokes Inversion based on Response functions (SIR) inversion code with a single-component atmosphere depth dependent in solar photosphere, assuming gradients physical parameters along line sight (LOS). To avoid effect noise, only pixels U and/or Q signals above 4.5...

We analyze spectropolarimetric observations of the chromospheric Ca II 8542 A line taken by Interferometric Bidimensional Spectrometer (IBIS) at Dunn Solar Telescope. The data were observed on 2012 January 29 for NOAA active region 11408. Adopting center-of-gravity (COG) approach we obtain line-of-sight (LOS) field strength IBIS line. LOS magnetic is determined in target inside a view 45 x 95 arcsec. values found to be increase up 800 G umbral and decrease systematically toward edges...

We analyze spectropolarimetric observations of the chromospheric Ca II 8542 line taken by Interferometric Bidimensional Spectrometer (IBIS) at Dunn Solar Telescope and photospheric Fe I 6302 lines obtained with Optical (SOT) Spectro-polarimeter (SP) on board Hinode satellite. The data were 2012 January 29 targeting NOAA active region (AR) 11408 AR 11410. By using center-of-gravity (COG) method we compute line-of-sight (LOS) field strength for observed 6301.5/6302.5 SP spacecraft every places...

We study the solar photospheric abundance of singly ionized neodymium (Nd II) using high resolution spectroscopic data obtained by Fourier transform spectrograph (FTS). Based on Local Thermodynamical Equilibrium (LTE) assumption, a new value Nd is derived. succeed to select 51 II lines with accurate transition probabilities measured experimentally Den Hartog et al. (2003) and damping parameters are determined from literature. Relying atomic Opacity Distribution Function (ODF), we construct...

Adopting the thermal free-free emission mechanism, coronal and chromospheric magnetic fields are derived from polarization spectral observations with Nobeyama Radioheliograph at 1.76 cm. The solar active regions (AR) located near disk center observed on January 8, 2015 (AR 12257) December 4, 2016 12615) used for estimate of microwave radio observations. We compare maps both intensity circularly polarized component optical Helioseismic Magnetic Imager chromosphere corona transition region...

The solar chemical abundances studied in considerable detail because of discrepant values metallicity inferred from different indicators, where the present work we have used 28 suitable atomic spectral nitrogen lines, relying on new equivalent widths measurements for determining abundance.Corresponding to neutral derived a abundance using Holweger and Müller (1974) model measured literature.Our study reported result be 8.05±0.09using gƒ-values Wiese Fuhr (2007).

The solar chemical abundances studied in considerable detail because of discrepant values metallicity inferred from different indicators, where the present work we have used 28 suitable atomic spectral nitrogen lines, relying on new equivalent widths measurements for determining abundance. Corresponding to neutral derived a abundance using Holweger and Muller model measured literature. Our study reported result be 8.05 (sigma = 0.09) gf-values Wiese Fuhr.