TY - JOUR

T1 - Diagnostics of Parameters of Hot Jets in the Solar Corona in Time Series of Images

AU - Stupishin, A. G.

AU - Anfinogentov, S. A.

AU - Kaltman, T. I.

N1 - Publisher Copyright: © 2021, Pleiades Publishing, Ltd.

PY - 2021/12

Y1 - 2021/12

N2 - Abstract: The goal of the work is to identify and study the dynamics of solar hot jets. Collimated, ray-like structures with temperatures above the transition-zone temperature are recorded in time series images in the extreme ultraviolet (EUV) range. Observations with a high spatiotemporal resolution reveal various morphological features of the jets, their dynamics, and relationships with other coronal structures. To determine and diagnose the parameters of hot jets, an algorithm has been developed to search automatically for jets in homogeneous time series of images. The algorithm is based on the selection of contrasting details in the images of the “running difference” (the difference in the observed intensities at adjacent times). The identified time series of contrasting details are then automatically analyzed according to a number of parameters (area, aspect ratio, length of the time series), and a decision is made to assign the event to the jet class. Upon completion of the analysis, a report is generated (a machine-readable file indicating the parameters of the assumed jets and video files with images of the intensity, the running difference, and the assumed jets). Processing is implemented in the form of a “pipeline” (data loading–fragment cutting–construction of the running difference–search for candidates–report construction) in the IDL language. The described diagnostics was applied to observations in EUV light based on data from the Solar Dynamics Observatory (SDO) AIA for the period 2011–2019. The results are presented in a catalogue (“Catalogue of hot jets in the solar corona,” http://www.spbf.sao.ru/coronal-jets-catalog). The characteristics of the identified jets were estimated for a sample of 80 events: a duration of 1–17 min, an aspect ratio (ratio of length to width) of 4–21, and a length of 13–144 arc s. The further goal of this diagnostics is the statistical analysis of event parameters and the determination of the physical mechanisms responsible for the generation, collimation, and dynamics of plasma jets in the solar atmosphere.

AB - Abstract: The goal of the work is to identify and study the dynamics of solar hot jets. Collimated, ray-like structures with temperatures above the transition-zone temperature are recorded in time series images in the extreme ultraviolet (EUV) range. Observations with a high spatiotemporal resolution reveal various morphological features of the jets, their dynamics, and relationships with other coronal structures. To determine and diagnose the parameters of hot jets, an algorithm has been developed to search automatically for jets in homogeneous time series of images. The algorithm is based on the selection of contrasting details in the images of the “running difference” (the difference in the observed intensities at adjacent times). The identified time series of contrasting details are then automatically analyzed according to a number of parameters (area, aspect ratio, length of the time series), and a decision is made to assign the event to the jet class. Upon completion of the analysis, a report is generated (a machine-readable file indicating the parameters of the assumed jets and video files with images of the intensity, the running difference, and the assumed jets). Processing is implemented in the form of a “pipeline” (data loading–fragment cutting–construction of the running difference–search for candidates–report construction) in the IDL language. The described diagnostics was applied to observations in EUV light based on data from the Solar Dynamics Observatory (SDO) AIA for the period 2011–2019. The results are presented in a catalogue (“Catalogue of hot jets in the solar corona,” http://www.spbf.sao.ru/coronal-jets-catalog). The characteristics of the identified jets were estimated for a sample of 80 events: a duration of 1–17 min, an aspect ratio (ratio of length to width) of 4–21, and a length of 13–144 arc s. The further goal of this diagnostics is the statistical analysis of event parameters and the determination of the physical mechanisms responsible for the generation, collimation, and dynamics of plasma jets in the solar atmosphere.

UR - http://www.scopus.com/inward/record.url?scp=85123284620&partnerID=8YFLogxK

U2 - 10.1134/S0016793221080181

DO - 10.1134/S0016793221080181

M3 - Article

AN - SCOPUS:85123284620

VL - 61

SP - 1108

EP - 1115

JO - Geomagnetism and Aeronomy

JF - Geomagnetism and Aeronomy

SN - 0016-7932

IS - 8

ER -