GUVI Biblio

Investigation of the negative ionospheric response of the 8 September 2017 geomagnetic storm over the European sector

In this study, we investigate the negative ionospheric response over the European sector during two storms that took place on 8 September 2017, primarily, by exploiting observations over ten European locations. The spatial and temporal variations of TEC, foF2 and hmF2 ionospheric characteristics are examined with the aim to explain the physical mechanisms underlying the strong negative ionospheric response. We detected very sharp electron density (in terms of foF2 and TEC) decrease during the main phases of the two storms an ...

Oikonomou, Christina; Haralambous, Haris; Paul, Ashik; Ray, Sarbany; Alfonsi, Lucilla; Cesaroni, Claudio; Sur, Dibyendu;

Published by: Advances in Space Research      Published on: aug

YEAR: 2022     DOI: 10.1016/j.asr.2022.05.035

Large-scale traveling ionospheric disturbances; Mid-latitude ionospheric trough; September 2017 geomagnetic storm; Swarm satellite

The Terrestrial Magnetospheric Response to the 28th October 2021 CME

Waters, James; Jackman, Caitriona; Whiter, Daniel; Fogg, Alexandra; Lamy, Laurent; Carter, Jennifer; Fryer, Laura; Louis, Corentin; Carley, Eion; Briand, Carine; , others;

Published by:       Published on:

YEAR: 2022     DOI:

Multi-wavelength coordinated observations of ionospheric irregularity structures from an anomaly crest location during unusual solar minimum of the 24th cycle

The present paper reports coordinated ionospheric irregularity measurements at optical as well as GPS wavelengths. Optical measurements were obtained from Tiny Ionospheric Photometer (TIP) sensors installed onboard the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) satellites. GPS radio signals were obtained from a dual frequency GPS receiver operational at Calcutta (22.58\textdegreeN, 88.38\textdegreeE geographic; geomagnetic dip: 32.96\textdegree; 13.00\textdegreeN, 161.63\textdegreeE g ...

Paul, Ashik; Sur, Dibyendu; Haralambous, Haris;

Published by: Advances in Space Research      Published on: 03/2020

YEAR: 2020     DOI: 10.1016/j.asr.2019.11.035

GPS radio measurements; ionospheric irregularities; Northern crest of EIA; Optical measurements; solar minimum; TIP

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:

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

Sparse Hierarchical Nonparametric Bayesian learning for light field representation and denoising

In this paper, we present a sparse hierarchical non-parametric Bayesian (SHNB) model, which is used to represent the data captured by the light field cameras. Specifically, a light field can be represented as a set of sub-aperture views. In order to capture the visual variations of these viewpoints, we propose the so-called \textquotedblleftdepth flow\textquotedblright features. Then based on the depth flow features, we model these views statistically with a sparse representation in a fully unsupervised manner. While loca ...

Sun, Xing; Meng, Nan; Xu, Zhimin; Lam, Edmund; So, Hayden;

Published by:       Published on:

YEAR: 2016     DOI: 10.1109/IJCNN.2016.7727617

Characteristics of post-midnight L-band scintillation in the transition region from the equatorial to mid-latitudes over the Indian longitude sector using COSMIC, C/NOFS and GPS measurements

Occurrence of L band scintillations around midnight and postmidnight hours have not been well studied and reported from the higher equatorial latitudes in the transition region from the equatorial to midlatitudes over the Indian longitude sector. The present paper reports cases of postmidnight L band scintillation observations by COSMIC during March 2014 over the Indian longitude sector. GPS\ S₄measurements from the International Global Navigation Satellite Systems Service station at Lucknow (26.9 ...

Paul, A.; Haralambous, H.; Oikonomou, C.;

Published by: Radio Science      Published on: 12/2015

YEAR: 2015     DOI: 10.1002/2015RS005807

postmidnight L band scintillation over Indian longitude sector

Characteristics of postmidnight L band scintillation in the transition region from the equatorial to midlatitudes over the Indian longitude sector using COSMIC, C/NOFS, and GPS measurements

Paul, A; Haralambous, H; Oikonomou, C;

Published by: Radio Science      Published on:

YEAR: 2015     DOI:

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 d ...

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

Mars Reconnaissance Orbiter observation of Comet C/2013 A1 (Siding Spring)

Tamppari, Leslie; Zurek, Richard; Cantor, Bruce; Delamere, WA; Egan, Anthony; Humm, David; Kass, David; McEwen, Alfred; McGovern, Andy; Phillips, Roger; , others;

Published by:       Published on:

YEAR: 2014     DOI:

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

Observation of the exhaust plume from the space shuttle main engines using the microwave limb sounder

Pumphrey, H.; Lambert, A.; Livesey, N.;

Published by: Atmospheric Measurement Techniques      Published on: Jan-01-2011

YEAR: 2011     DOI: 10.5194/amt-4-89-2011

Observation of the exhaust plume from the space shuttle main engine using the Microwave Limb Sounder

Pumphrey, H.; Lambert, A.; Livesey, N.;

Published by: Atmospheric Measurement Techniques Discussions      Published on: Jan-01-2010

YEAR: 2010     DOI: 10.5194/amtd-3-3971-2010

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 ionosphe ...

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;

Published by:       Published on:

YEAR: 2006     DOI:

Developing cyber-infrastructure for addressing grand challenge questions in Sun-Earth system science: First results of a testbed worldwide online conference series

Kozyra, JU; Barnes, R; Fox, NJ; Fox, PA; Kuznetsova, MM; Morrison, D; Pallamraju, D; , Papitashvili; Ridley, A; Talaat, ER; , others;

Published by:       Published on:

YEAR: 2006     DOI:

Two components of ionospheric plasma structuring at midlatitudes observed during the large magnetic storm of October 30, 2003

Basu, Su.; Basu, S.; Makela, J.; Sheehan, R.; MacKenzie, E.; Doherty, P.; Wright, J.; Keskinen, M.; Pallamgaju, D.; Paxton, L.; Berkely, F.;

Published by: Geophysical Research Letters      Published on: Jan-01-2005

YEAR: 2005     DOI: 10.1029/2004GL021669

Space Sciences-Special Section: Violent Sun-Earth Connection Events of October-November 2003-L12S06-Two components of ionospheric plasma structuring at midiatitudes observed during the large

Basu, Su; Basu, Su; Makela, JJ; Sheehan, RE; MacKenzie, E; Doherty, P; Wright, JW; Keskinen, MJ; Pallamraju, D; Paxton, LJ; , others;

Published by: Geophysical Research Letters      Published on:

YEAR: 2005     DOI:

First ground-based measurements of OI 6300 \AA daytime aurora over Boston in response to the 30 October 2003 geomagnetic storm

Pallamraju, D; Chakrabarti, S;

Published by: Geophysical Research Letters      Published on:

YEAR: 2005     DOI:

HIRISE observations of daytime aurora over boston from ground in response to the magnetic disturbance of october 30, 2003 as corroborated by the TIMED measurements from space

Pallamraju, D; Chakrabarti, S;

Published by:       Published on:

YEAR: 2004     DOI:

Two Components of Ionospheric Plasma Structuring at Mid-Latitudes during Large Magnetic Storms

Basu, S; Makela, J; Sheehan, R; MacKenzie, E; Keskinen, M; Pallamraju, D; Paxton, L;

Published by:       Published on:

YEAR: 2004     DOI: