Recent work on sprite spectrum in Taiwan

Abstract

This paper reports on the recent developments in spectroimagers for sprite campaigns in Taiwan. We first introduce two types of spectroimagers, the slit and slitless types, and discuss their advantages and shortcomings. Next we explore the instrument development and procedures undertaken for this study. In 2006, a slit spectroimager was installed for a sprite campaign and on 15 August of that year, two sprite spectra were recorded using the slit spectroimager along with seven sprites, one halo, one ELVES emission and two jets. By the end of 2015, a slitless spectroimager had been successfully constructed and was ready to conduct additional investigations. On 7 May 2016, a sprite spectrum was recorded using the slitless spectroimager. Following an examination of the calibrations (comprising detection region field of view, wavelength calibration, and response curve), data analysis, and additional calibrations (comprising elevation and azimuthal angles, atmospheric transmittance, and theoretical wavelength calculations) performed in this study, we present the results from our observed sprite spectra using the slit and slitless spectroimagers.

Scientific goals of optical instruments of the National Heliogeophysical Complex

“…The spectral composition of optical glow from lightning discharges (elves, sprites, etc.) mainly contains emission lines of molecular nitrogen vibration transitions lying in the red and infrared portions of the visible spectrum [Lu et al, 2017]. Changes in the chemical composition and physical conditions of the mesospherethe region of maximum development of high-altitude lightning dischargesshould have a significant effect on their parameters, therefore the research into these sporadic events is promising for the study of the upper atmosphere, space weather events, and solar-terrestrial relations.…”

A comprehensive study of the radiative properties of NO—a first step toward a complete air opacity

“…In addition, because of the energetic proximity of these electronic excited states, the absorption/emission bands from these electronic excited states will likely lead to absorption/emission in the near-infrared and visible regions, where the JWST and Ariel space telescopes will perform observations. For example, the transitions between the two lowest-lying quartet states b 4 Σ − ↔ a 4 Π constitute what are known as the Ogawa bands [129,177], and, as far as we are aware, have not been included in theoretical radiative properties studies of air or utilized in extensive line-list calculations of NO.…”

“…Radiative properties of heated air species are vital ingredients in detecting, modeling and characterizing many physical objects and phenomena for atmospheric science [1][2][3][4][5], exoplanets [1,[6][7][8], lightning [1,6,[9][10][11], meteoroids or vehicle (re)entry [12][13][14][15][16][17][18][19][20], electrostatic discharges or plasma Air species moles as a function of temperature along the Hugoniot of ambient air, calculated with the thermochemical code Magpie [38]. Here, a typical humidity of 35% was utilized.…”

Introduction to the special issue on recent advances and developments in atmospheric electricity

“…Their innovative data analytical methods of nadir observation from ISS include: (1) extraction of relatively weak sprite emission from lightning emission, (2) a calculation of the intensity ratio between different photometer channels, and (3) an estimation of the charge moment change of the suspected sprite-producing CG discharge. For TLE ground campaign, Peng et al (2017) showed the first coordinated observation on TLEs from space and ground, and Lu et al (2017b) analyzed a recorded sprite spectrum by the slitless spectroimager in the 2016 Lulin Observatory ground campaign. Yang et al (2017) showed TLEs ground observations in mainland China in 2012.…”