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Thermal Structure of the Middle and Upper Atmosphere of Mars From ACS/TGO CO2 Spectroscopy
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS. 2022. Vol. 127. No. 10. Article e2022JE007286.
Belyaev D. A.
Temperature and density in the upper Martian atmosphere, above similar to 100 km, are key diagnostic parameters to study processes of the species' escape, investigate the impact of solar activity, model the atmospheric circulation, and plan spacecraft descent or aerobraking maneuvers. In this paper, we report vertical profiling of carbon dioxide (CO2) density and temperature from the Atmospheric Chemistry Suite (ACS) solar occultations onboard the ExoMars Trace Gas Orbiter. A strong CO2 absorption band near 2.7 mkm observed by the middle infrared spectrometric channel (ACS MIR) allows the retrieval of the atmospheric thermal structure in an unprecedentedly large altitude range, from 20 to 180 km. We present the latitudinal and seasonal climatology of the thermal structure for 1.5 Martian years (MYs), from the middle of MY 34 to the end of MY 35. The results show the variability of distinct atmospheric layers, such as a mesopause (derived from 70 to 145 km) and homopause, changing from 90 to 100 km at aphelion to 120-130 km at perihelion. Some short-term homopause fluctuations are also observed depending on the dust activity.
Boldyrev K., Sektarov E., Большаков А. П. et al., Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 2023 Vol. 382 No. 2265 P. 20230170
The neutrally charged silicon-vacancy defect (SiV0) is a colour centre in diamond with spin S = 1, a zero-phonon line (ZPL) at 946 nm and long spin coherence, which makes it a promising candidate for quantum network applications. For the proper performance of such colour centres, all of them must have identical optical characteristics. However, in practice, there ...
Added: May 16, 2024
Starichenko E., Belyaev Denis A., JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS 2021 Vol. 126 No. 8 Article e2021JE006899
The paper presents observations of gravity wave-induced temperature disturbances in the Martian atmosphere obtained with the mid-infrared (MIR) spectrometer, a channel of the Atmospheric Chemistry Suite instrument on board the Trace Gas Orbiter (ACS/TGO). Solar occultation measurements of a CO2 absorption band at 2.7 mu m were used for retrieving density and temperature profiles between ...
Added: November 28, 2022
Belyaev D. A., Geophysical Research Letters 2021 Vol. 48 No. 10 Article e2021GL093411
We present the first water vapor profiles encompassing the upper mesosphere of Mars, 100–120 km, far exceeding the maximum altitudes where remote sensing has been able to observe water to date. Our results are based on solar occultation measurements by Atmospheric Chemistry Suite (ACS) onboard the ExoMars Trace Gas Orbiter (TGO). The observed wavelength range ...
Added: November 25, 2022
Лигер В. В., Mironenko V., Курицын Ю. А. et al., Квантовая электроника 2022 Т. 52 № 9 С. 831–837
Разработан новый вариант метода диодной лазерной абсорбционной спектроскопии (ДЛАС) для определения температуры горячих зон. Метод основан на комбинации медленного сканирования частоты излучения зондирующего диодного лазера в окрестности линии поглощения тестовой молекулы среды и быстрой модуляции частоты излучения с амплитудой порядка ширины линии поглощения. Особенностью метода является использование двухлучевой дифференциальной схемы, логарифмическое преобразование сигналов и регистрация ...
Added: October 26, 2022
Liger V., Mironenko V., Kuritsyn Y. et al., Sensors 2020 Vol. 20 No. 21 Article 6286
Abstract: A new scheme for a calibration-free diode laser absorption spectroscopy (DLAS) sensor for
measuring the parameters of harsh zones is proposed. The key element of the scheme is a micro-prism
retroreflector (MPRR). The MPRR facilitates an increase in the mechanical stability of the sensor and
a decrease in the background thermal radiation in the hot areas of ...
Added: October 20, 2022
Telikova K. N., Balashev S., Notredaeme P. et al., Monthly Notices of the Royal Astronomical Society 2022 Vol. 510 No. 4 P. 5974–5983
We present a spectroscopic investigation with the Very Large Telescope/X-shooter of seven candidate extremely strong damped Lyman-α absorption systems [ESDLAs, N(H I) ≥ 5 × 1021 cm-2] observed along quasar sightlines. We confirm the extremely high column densities, albeit slightly (0.1 dex) lower than the original ESDLA definition for four systems. We measured low-ionization metal abundances ...
Added: February 4, 2022
Balashev S., Kosenko D. N., Monthly Notices of the Royal Astronomical Society: Letters 2020 Vol. 492 No. 1 P. 45–49
We present a semi-analytical description of the relative hydrogen deuteride (HD)/H2 abundance in the diffuse interstellar medium. We found three asymptotics of the relative HD/H2 abundance for different parts of the medium and their dependence on the physical parameters, namely, number density, intensity of the ultraviolet field, cosmic ray ionization rate, and metallicity. Our calculations are in ...
Added: February 4, 2022
Balashev S., Ledoux C., Noterdaeme P., Monthly Notices of the Royal Astronomical Society 2020 Vol. 497 No. 2 P. 1946–1956
We present the detection of excited fine-structure energy levels of singly ionized silicon and neutral carbon associated with the proximate damped Lyman-α system at zabs = 2.811 towards Q 0528-250. This absorber has an apparent relative velocity that is inconsistent with the Hubble flow indicating motion along the line-of-sight towards the quasar, i.e. zabs > zem. We ...
Added: February 4, 2022
Klimenko V. V., Balashev S., Monthly Notices of the Royal Astronomical Society 2020 Vol. 498 No. 2 P. 1531–1549
We present the results of an analysis of the physical conditions (number density, intensity of UV field, kinetic temperature) in the cold H2-bearing interstellar medium of local and high-redshift galaxies. Our measurements are based on the fit to the observed population of H2 rotational levels and C I fine-structure levels with the help of grids of ...
Added: February 4, 2022
Kosenko D. N., Balashev S., Journal of Physics: Conference Series 2020 Vol. 1697 No. 1 Article 012031
We present constraints on physical conditions in diffuse HD/H2-bearing molecular clouds using measured HD/H2 column density ratio. We used recently published formalism that describes how this ratio changes with ultraviolet field intensity, number density and cosmic ray ionization rate. Out of them the most important parameter is the cosmic ray ionization rate, as it determines the ...
Added: February 4, 2022
Telikova K. N., Balashev S., Notredaeme P. et al., Journal of Physics: Conference Series 2020 Vol. 1697 No. 1 Article 012034
We present a spectroscopic analysis of seven Extremely Strong Damped Lyα systems at redshifts z = 2–3, obtained with the intermediate-resolution spectrograph X-shooter on the Very Large Telescope. For all systems we estimated column densities of the neutral atomic hydrogen HI, metal abundances and dust depletion. We firmly detected molecular hydrogen H2 in two systems in ...
Added: February 4, 2022
Kosenko D. N., Balashev S., Noterdaeme P. et al., Monthly Notices of the Royal Astronomical Society 2021 Vol. 505 No. 3 P. 3810–3822
We present a systematic study of deuterated molecular hydrogen (HD) at high redshift, detected in absorption in the spectra of quasars. We present four new identifications of HD lines associated with known H2H2-bearing Damped Lyman-α systems. In addition, we measure upper limits on the HDHD column density in 12 recently identified H2H2-bearing DLAs. We find that the new HDHD detections have ...
Added: February 4, 2022
Gupta N., Jagannathan P., Srianand R. et al., Astrophysical Journal 2021 Vol. 907 No. 1 Article 11
We present details of the Automated Radio Telescope Imaging Pipeline (ARTIP) and the results of a sensitive blind search for H I and OH absorbers at z < 0.4 and z < 0.7, respectively. ARTIP is written in Python 3.6, extensively uses the Common Astronomy Software Application tools and tasks, and is designed to enable ...
Added: February 4, 2022
Noterdaeme P., Balashev S., Combes F. et al., Astronomy and Astrophysics 2021 Vol. 651 Article A17
We present 3 mm observations of the quasar J0015+1842 at z = 2.63 with the NOrthern Extended Millimeter Array (NOEMA). Our data reveal molecular gas, traced with a Gaussian CO(3-2) line, with a remarkably high velocity dispersion (FWHM = 1010 ± 120 km s−1) that corresponds to a total molecular mass MH2 ≈ (3.4 − 17) ...
Added: February 4, 2022
Noterdaeme P., Balashev S., Ledoux C. et al., Astronomy and Astrophysics 2021 Vol. 651 Article 78
Aims: We aim to study several key physical properties of quasar absorption-line systems that are subtly encoded in their absorption profiles and have not yet been thoroughly investigated or constrained.
Methods: We analysed a high-resolution (R = 140 000) spectrum of the bright quasar HE 0001−2340 (zem = 2.26) obtained with ESPRESSO, which was recently installed at ...
Added: February 4, 2022
Balashev S., Gupta N., Kosenko D. N., Monthly Notices of the Royal Astronomical Society 2021 Vol. 504 No. 3 P. 3797–3811
Hydroxyl (OHOH) is known to form efficiently in cold gas (T ~ 100 K) along with the molecule H2H2 and can be used as an efficient tracer of the diffuse molecular gas in the interstellar medium (ISM). Using a simple formalism describing the HI/H2HI/H2 transition and a reduced network of major chemical reactions, we present a semi-analytical prescription to ...
Added: February 4, 2022
Noterdaeme P., Balashev S., Krogager J. -. et al., Astronomy and Astrophysics 2021 Vol. 646 Article A108
We present ultraviolet to near infrared spectroscopic observations of the quasar SDSS J001514+184212 and its proximate molecular absorber at z = 2.631. The [O III] emission line of the quasar is composed of a broad (FWHM ∼ 1600 km s-1), spatially unresolved component, blueshifted by about 600 km s-1 from a narrow, spatially-resolved component (FWHM ∼ ...
Added: February 4, 2022
Izvekova Y. N., Popel S. I., Izvekov O. Y., Icarus 2022 Vol. 371 Article 114717
Dust and dusty plasma play significant role in the atmosphere and ionosphere of Mars. Electrification in dust events such as dust devils and dust storms can presumably lead to electric fields large enough for discharges to take place and for existence of oscillations in the Schumann cavity. We discuss the role of dust and dusty ...
Added: September 29, 2021
Boldyrev K., Молчанова А. Д., Кузьмин Н. Н. et al., Low Temperature Physics 2017 Т. 43 № 6 С. 728–731
Проведено комплексное исследование монокристалла CrBO3 методами оптической и длинноволновой спектроскопии в широком диапазоне температур. Даны фактор-групповой и корреляционный анализы фононных мод. Экспериментально методом нарушенного полного внутреннего отражения обнаружены все ИК активные фононы и установлены их частоты. Выявлен магнитный фазовый переход при темпера-туре 6 К. В магнитоупорядоченном состоянии обнаружена анизотропия оптического спектра при поляри-зационных исследованиях в ...
Added: February 8, 2019
Rogachev A., Prutskov G. V., В кн.: Научно-техническая конференция студентов, аспирантов и молодых специалистов НИУ ВШЭ им. Е.В. Арменского. Материалы конференции.: М.: МИЭМ НИУ ВШЭ, 2015. С. 250–250.
В работе описаны особенности проведения исследования органических образцов, сформированных на поверхности жидкости, методами абсорбционной спектроскопии с применением синхротронного излучения. Представлены первые экспериментальные данные. ...
Added: July 22, 2015