Bibliography
Notice:
|
Found 14 entries in the Bibliography.
Showing entries from 1 through 14
2022 |
Atmospheric disturbances caused by seismic activity are a complex phenomenon. The Lithosphere–Atmosphere–Ionosphere Coupling (LAIC) (LAIC) mechanism gives a detailed idea Kundu, Subrata; Chowdhury, Swati; Ghosh, Soujan; Sasmal, Sudipta; Politis, Dimitrios; Potirakis, Stelios; Yang, Shih-Sian; Chakrabarti, Sandip; Hayakawa, Masashi; Published by: Journal of Sensors Published on: YEAR: 2022   DOI: 10.1155/2022/3201104 |
2021 |
Long Term Ionospheric VTEC Variation during Solar cycle 24 as Observed from Indian IGS GPS Station Thermo-ionosheric O/N2 ratio obtained by GUVI for March and September equinox days, and June and December solstice days of 2014 represented as the equinox month and solstice Kundu, S; Sasmal, S; Chakrabarti, SK; Published by: Int. J. Sci. Res. in Physics and Applied Sciences Vol Published on: |
2020 |
Kundu, Subrata; Sasmal, Sudipta; Chakraborti, Suman; Chakrabarti, Sandip; Published by: Published on: |
Pallamraju, Duggirala; Karan, Deepak; Laskar, Fazlul; Lakshmi, Vijaya; Chakrabarti, Supriya; Published by: Journal of Atmospheric and Solar-Terrestrial Physics Published on: |
2019 |
Imaging of the Daytime Ionospheric Equatorial Arcs With Extreme and Far Ultraviolet Airglow We present the first global images of the daytime ionosphere equatorial arcs as manifested in the 83.4-nm airglow. These images were collected by the Limb-Imaging Ionospheric and Thermospheric Extreme-Ultraviolet Spectrograph that commenced operations on the International Space Station in early 2017. We compare these to simultaneous images of the ionospheric radiative recombination airglow at 135.6 nm measured between 250- and 350-km tangent altitudes, where the emission is generated primarily by radiative recombination of ionospheric plasma. We find that these signatures of the dense crests of the Equatorial Ionization Anomaly, their symmetry, and daily variability at 1300\textendash1600 LT over 1\textendash6 April 2017 do not show any strong periodicity during this time. These results are also important to the joint interpretation of these two correlated extreme and far ultraviolet emission features measured under solar minimum conditions and the evaluation of absorption and radiative transfer effects that affect these emissions differently. Stephan, A.; Finn, S.; Cook, T.; Geddes, G.; Chakrabarti, S.; Budzien, S.; Published by: Journal of Geophysical Research: Space Physics Published on: 06/2019 YEAR: 2019   DOI: 10.1029/2019JA026624 |
2014 |
Ionospheric imaging using merged ultraviolet airglow and radio occultation data The Limb-imaging Ionospheric and Thermospheric Extreme-ultraviolet Spectrograph (LITES) and GPS Radio Occultation and Ultraviolet Photometry-Colocated (GROUP-C) experiments are being considered for flight aboard the Space Test Program Houston 5 (STP-H5) experiment pallet to the International Space Station (ISS). LITES is a compact imaging spectrograph that makes one-dimensional images of atmospheric and ionospheric ultraviolet (60-140 nm) airglow above the limb of the Earth. The LITES optical design is advantageous in that it uses a toroidal grating as its lone optical surface to create these high-sensitivity images without the need for any moving parts. GROUP-C consists of two instruments: a nadir-viewing ultraviolet photometer that measures nighttime ionospheric airglow at 135.6 nm with unprecedented sensitivity, and a GPS receiver that measures ionospheric electron content and scintillation with the assistance of a novel antenna array designed for multipath mitigation. By flying together, these two experiments form an ionospheric observatory aboard the ISS that will provide new capability to study low- and mid-latitude ionospheric structures on a global scale. This paper presents the design and implementation of the LITES and GROUP-C experiments on the STP-H5 payload that will combine for the first time high-sensitivity in-track photometry with vertical spectrographic imagery of ionospheric airglow to create high-fidelity images of ionospheric structures. The addition of the GPS radio occultation measurement provides the unique opportunity to constrain, as well as cross-validate, the merged airglow measurements. \textcopyright (2014) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only. Stephan, Andrew; Budzien, Scott; Finn, Susanna; Cook, Timothy; Chakrabarti, Supriya; Powell, Steven; Psiaki, Mark; Published by: Published on: YEAR: 2014   DOI: 10.1117/12.2061420 |
2011 |
Pallamraju, Duggirala; Chakrabarti, Supriya; Solomon, Stanley; Published by: Journal of Geophysical Research Published on: Jan-01-2011 YEAR: 2011   DOI: 10.1029/2010JA015934 |
2006 |
Pallamraju, D; Chakrabarti, S; Solomon, S; Crowley, G; Published by: Published on: |
Contributions of imaging Echelle spectrographs to daytime optical aeronomy We present a brief overview of the contributions made by high spectral resolution imaging spectrographs that are capable of obtaining daytime airglow and auroral emissions in the presence of scattered solar background continuum, to the advancement in our understanding of the dynamics in daytime upper atmosphere. By making use of ground-based OI 6300 angstrom daytime emissions from various geomagnetic latitudes this technique has succeeded in demonstrating many interesting and first of their kind results ranging from ionosphere–thermosphere coupling, space weather interactions to magnetosphere–thermosphere–ionosphere coupling. Finally, in view of the promising results by this technique we propose future advancements in both instrumentation and strategic observational planning with optical spectrographs. Pallamraju, D.; Chakrabarti, S.; Published by: Journal of Atmospheric and Solar-Terrestrial Physics Published on: YEAR: 2006   DOI: https://doi.org/10.1016/j.jastp.2005.05.013 dayglow; AURORA; Spectroscopy; Optical techniques; Thermosphere–ionosphere coupling; space weather |
Proton aurora observed from the ground Auroral keV proton precipitation is a significant-energy particle input upon the high-latitude ionosphere, often dominating in the polar cusp and the dusk sector of the equatorward auroral oval. A unique signature of proton precipitation is the Doppler-shifted H Balmer lines (Hα, Hβ) observable from the ground. These lines are emitted by energetic H atoms produced within the proton beam through charge-exchange processes. Their observations allow one to assess the location, dynamic evolution especially during magnetospheric substorms, and spectral characteristics of the source regions of the energetic protons projected to the high-latitude ionosphere. They also allow to identify the associated magnetospheric processes and to evaluate ionospheric perturbations induced by the energetic protons. The source regions include the cusp, the low-latitude boundary layer, the mantle, and the plasma sheet, including its dayside extension. If qualitative studies of proton aurora morphology and time variability are possible with photometric observations of hydrogen lines, quantitative assessment of H-emission brightness, and incident proton mean energy and flux, requires spectroscopic measurements of the H-emission profile. In this review paper, we report on the tremendous progress made in the past 20 years in the observational capability applied to proton aurora and in the modeling of energetic proton transport in the upper atmosphere, which is needed for quantitative analysis of the spectroscopic measurements of H emission. The current issues in the field are also discussed and suggestions for future directions are proposed. They include the deployment of chains of instruments dedicated to proton aurora studies along magnetic local time and geomagnetic latitude, such as high-spectral-resolution-imaging spectrographs and spectral imagers. Such campaigns would improve our understanding of the topology and dynamics of the magnetosphere, and provide, at dayside, the azimuthal extent of the reconnection region. Magnetically conjugate experiments and optical instruments dedicated to proton aurora observations in Antarctica are greatly encouraged. The contribution of atmospheric scattering to the H-spectral profiles needs to be further assessed and additional laboratory measurements of differential cross sections are required for a comprehensive understanding of the physics of proton aurora. Galand, Marina; Chakrabarti, Supriya; Published by: Journal of Atmospheric and Solar-Terrestrial Physics Published on: YEAR: 2006   DOI: https://doi.org/10.1016/j.jastp.2005.04.013 |
2005 |
Pallamraju, D; Chakrabarti, S; Published by: Geophysical Research Letters Published on: |
2004 |
Pallamraju, D; Chakrabarti, S; Published by: Published on: |
2003 |
The primary goal of the Spectroscopy and Photometry of the IGM s Diffuse Radiation (SPIDR) Mission is to detect and map the huge filamentary structures, the "cosmic web", predicted to Lapington, Jonathan; Chakrabarti, Supriya; Cook, Timothy; Goeke, Robert; Gsell, JC; Gsell, VT; Published by: Published on: |
1987 |
The OI 3d $^3$D°-2p4 $^3$P Transition at 1026 \AA in the Day Airglow Meier, RR; , Anderson; Paxton, LJ; McCoy, RP; Chakrabarti, Supriya; Published by: Journal of Geophysical Research: Space Physics Published on: |
1