Bibliography

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Found 12 entries in the Bibliography.

Showing entries from 1 through 12

2020

Effect of solar flux versus compositional variations on the variability of daytime oxygen optical emission rates over low-and mid-latitudes

Pallamraju, Duggirala; Karan, Deepak; Laskar, Fazlul; Lakshmi, Vijaya; Chakrabarti, Supriya;

Published by: Journal of Atmospheric and Solar-Terrestrial Physics Published on:

YEAR: 2020 DOI:

2018

Effect of geomagnetic storms on the daytime low-latitude thermospheric wave dynamics

Karan, Deepak; Pallamraju, Duggirala;

Published by: Journal of Atmospheric and Solar-Terrestrial Physics Published on: 05/2018

YEAR: 2018 DOI: 10.1016/j.jastp.2018.02.003

2014

Effects of prolonged southward interplanetary magnetic field on low-latitude ionospheric electron density

The present work describes the low-latitude ionospheric variability during an unusually prolonged (~33 h) geomagnetically disturbed condition that prevailed during 15\textendash16 July 2012. The low-latitude electron density in summer hemisphere, investigated using ground- and satellite-based observations, responded to this by generating strong negative ionospheric storm on 16 July. The maximum electron density on 16 July over Indian low latitudes was reduced by more than 50\% compared to that on a geomagnetically quiet day (14 July 2012). In contrast to the extreme reduction in total electron content (TEC) in the Northern Hemisphere, TEC from a winter hemispheric station revealed substantial (~23 total electron content unit, 1 TECU = 10¹⁶ el m^-2) enhancements on the same day. This contrasting hemispherical response in TEC is suggested to be due to the combined effects of strong interhemispheric and solar-driven day-night winds. Further, very weak equatorial electrojet (EEJ) strength on 16 July indicated that the westward electric field perturbations in the low-latitude ionosphere were possibly due to the disturbance dynamo effect associated with meridional circulation from polar to equatorial latitudes. Interestingly, despite reduction in the integrated EEJ strength on 15 July, the low-latitude electron density showed substantial enhancement, highlighting the significant effect of the positive ionospheric storm on the low-latitude ionosphere. The roles of electrodynamical/neutral-dynamical and compositional disturbances are discussed in view of these observations to understand low-latitude ionospheric response when geomagnetic disturbance persists for longer duration.

Bagiya, Mala; Hazarika, Rumajyoti; Laskar, Fazlul; Sunda, Surendra; Gurubaran, S.; Chakrabarty, D.; Bhuyan, P.; Sridharan, R.; Veenadhari, B.; Pallamraju, D.;

Published by: Journal of Geophysical Research: Space Physics Published on: 07/2014

YEAR: 2014 DOI: 10.1002/2014JA020156

low-latitude ionosphere; neutral winds; prolonged southward IMF Bz; thermospheric neutral composition

2011

On deriving incident auroral particle fluxes in the daytime using combined ground-based optical and radar measurements

Pallamraju, Duggirala; Chakrabarti, Supriya; Solomon, Stanley;

Published by: Journal of Geophysical Research Published on: Jan-01-2011

YEAR: 2011 DOI: 10.1029/2010JA015934

2006

Compositional changes in thermosphere during a geomagnetic storm inferred using ground-based daytime OI 630.0 nm optical airglow emissions

Pallamraju, D; Chakrabarti, S; Solomon, S; Crowley, G;

Published by: Published on:

YEAR: 2006 DOI:

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

A Sun-to-Earth Campaign Joining Observations from the Great Observatory with Worldwide Satellite and Ground-Based Resources to Investigate System Science Frontiers

Kozyra, JU; Shibata, K; Barnes, RJ; Basu, S; Davila, JM; Fox, NJ; Gopalswamy, N; Kuznetsova, MM; Pallamraju, D; Paxton, LJ; , others;