GUVI

Global UltraViolet Imager

# GUVI Biblio

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## Found 21 entries in the Bibliography.

### Showing entries from 1 through 21

 2022 On the impact of meridional wind circulation changes in the electron density distribution over the Indian equatorial and low latitude ionospheric region during a severe geomagnetic storm Using a suite of instruments, which included a chain of ground-based dual-frequency GPS receivers, and magnetometers, we have studied the importance of thermospheric meridional wind circulation in controlling the distribution of plasma over the Indian low latitude ionospheric regions during the period of a severe geomagnetic storm. The storm on 15 May 2005, which had its onset coinciding with the local noon time sector for the Indian ionospheric zone, was a severe geomagnetic storm with symH ∼ - 305 nT. A steep increase i ... Ambili, K.; Choudhary, R.; Published by: Advances in Space Research      Published on: oct YEAR: 2022     DOI: 10.1016/j.asr.2022.06.027 Quantification of the role of gravity wave induced TIDs in modulating ESF day to day variability during geomagnetically disturbed periods The control of magnetic disturbance induced seed perturbations on the daily variation in night-time ionization irregularity occurrence is studied using ionosonde data and TIMED/GUVI neutral density data at the magnetic equatorial region, Trivandrum. The study reveals that there is a requisite threshold seed amplitude for ESF to occur at a particular altitude and this requisite seed increases as the altitude decreases. This dependence of requisite seed perturbation on altitude for multiple years, which incorporates the electr ... Sruthi, T.; Manju, G.; Published by: Advances in Space Research      Published on: mar YEAR: 2022     DOI: 10.1016/j.asr.2021.11.038 2021 A Synoptic-Scale Wavelike Structure in the Nighttime Equatorial Ionization Anomaly Both ground- and satellite-based airglow imaging have significantly contributed to understanding the low-latitude ionosphere, especially the morphology and dynamics of the equatorial ionization anomaly (EIA). The NASA Global-scale Observations of the Limb and Disk (GOLD) mission focuses on far-ultraviolet airglow images from a geostationary orbit at 47.5°W. This region is of particular interest at low magnetic latitudes because of the high magnetic declination (i.e., about -20°) and proximity of the South Atlantic magnetic ... Rodríguez-Zuluaga, J.; Stolle, C.; Yamazaki, Y.; Xiong, C.; England, S.; Published by: Earth and Space Science      Published on: YEAR: 2021     DOI: 10.1029/2020EA001529 2020 Modeling the Impact of Metallic Ion Layers on Equatorial Spread With SAMI3/ESF The impact of region metal ion layers on the development of equatorial plasma bubbles is investigated using the SAMI3/ESF model. We find that metal ion layers reduce the growth rate of the generalized Rayleigh-Taylor instability (GRTI) and act to suppress the development of equatorial plasma bubbles. This is consistent with ... Huba, J.; Krall, J.; Drob, D.; Published by: Geophysical Research Letters      Published on: 02/2020 YEAR: 2020     DOI: 10.1029/2020GL087224 2019 Global-scale Observations of the Equatorial Ionization Anomaly Abstract The National Aeronautics and Space Administration Global-scale Observations of the Limb and Disk ultraviolet spectrograph has been imaging the equatorial ionization anomaly (EIA), regions of the ionosphere with enhanced electron density north and south of the magnetic equator, since October 2018. The initial 3 months of observations was during solar minimum conditions, and they included observations in December solstice of unanticipated variability and depleted regions. Depletions are seen on most nights, in contras ... Eastes, R.; Solomon, S.; Daniell, R.; Anderson, D.; Burns, A.; England, S.; Martinis, C.; McClintock, W.; Published by: Geophysical Research Letters      Published on: YEAR: 2019     DOI: https://doi.org/10.1029/2019GL084199 2015 The Morphology of Equatorial Plasma Bubbles - a review Plasma bubbles that occur in the equatorial F-region make up one of the most distinguishing phenomena in the ionosphere. Bubbles represent plasma depletions with respect to the background ionosphere, and are the major source of electron density irregularities in the equatorial F-region. Such bubbles are seen as plasma depletion holes (in situ satellite observations), vertical plumes (radar observations), and emission-depletion bands elongated in the north-south direction (optical observations). However, no technique can o ... Kil, Hyosub; Published by: Journal of Astronomy and Space Sciences      Published on: 03/2013 YEAR: 2015     DOI: 10.5140/JASS.2015.32.1.13 2014 Geomagnetic control of equatorial plasma bubble activity modeled by the TIEGCM with Kp Describing the day-to-day variability of Equatorial Plasma Bubble (EPB) occurrence remains a significant challenge. In this study we use the Thermosphere-Ionosphere Electrodynamics General Circulation Model (TIEGCM), driven by solar (F10.7) and geomagnetic (Kp) activity indices, to study daily variations of the linear Rayleigh-Taylor (R-T) instability growth rate in relation to the measured scintillation strength at five longitudinally distributed stations. For locations characterized ... Carter, B.; Retterer, J.; Yizengaw, E.; Groves, K.; Caton, R.; McNamara, L.; Bridgwood, C.; Francis, M.; Terkildsen, M.; Norman, R.; Zhang, K.; Published by: Geophysical Research Letters      Published on: 08/2014 YEAR: 2014     DOI: 10.1002/2014GL060953 2013 The Ionospheric Bubble Index deduced from magnetic field and plasma observations onboard Swarm In the post-sunset tropical ionospheric F-region plasma density often exhibits depletions, which are usually called equatorial plasma bubbles (EPBs). In this paper we give an overview of the Swarm Level 2 Ionospheric Bubble Index (IBI), which is a standard scientific data of the Swarm mission. This product called L2-IBI is generated from magnetic field and plasma observations onboard Swarm, and gives information as to whether a Swarm magnetic field observation is affected by EPBs. We validate the performance of the L2-IBI ... Park, J.; Noja, M.; Stolle, C.; Lühr, H.; Published by: Earth, Planets and Space      Published on: 11/2014 YEAR: 2013     DOI: 10.5047/eps.2013.08.005 GPS TEC near the crest of the EIA at 95\textdegreeE during the ascending half of solar cycle 24 and comparison with IRI simulations Total electron content (TEC) data obtained from GPS dual frequency measurements during the ascending half of the solar cycle 24 from 2009 to 2012 over Dibrugarh (27.5\textdegreeN, 94.9\textdegreeE; 17.6\textdegreeN MLAT) have been used to study the diurnal, seasonal, annual and solar cycle variation of TEC. The measurements reported here are for the first time from the location situated at the poleward edge of the northern equatorial ionization anomaly (EIA) and within the peak region of the longitudinal wave number 4 (WN ... Bhuyan, Pradip; Hazarika, Rumajyoti; Published by: Advances in Space Research      Published on: 10/2013 YEAR: 2013     DOI: 10.1016/j.asr.2013.06.029 Ion-neutral coupling during deep solar minimum The equatorial ionosphere under conditions of deep solar minimum exhibits structuring due to tidal forces. Data from instruments carried by the Communication/Navigation Outage Forecasting System (C/NOFS) which was launched in April 2008 have been analyzed for the first 2 years following launch. The Planar Langmuir Probe (PLP), Ion Velocity Meter (IVM) and Vector Electric Field Investigation (VEFI) all detect periodic structures during the 2008\textendash2010 period which appear to be tides. However when the tidal features ... Huang, Cheryl; Roddy, Patrick; Sutton, Eric; Stoneback, Russell; Pfaff, Robert; Gentile, Louise; Delay, Susan; Published by: Journal of Atmospheric and Solar-Terrestrial Physics      Published on: 10/2013 YEAR: 2013     DOI: 10.1016/j.jastp.2012.11.009 Are plasma bubbles a prerequisite for the formation of broad plasma depletions in the equatorial F region? Formation of broad plasma depletions (BPDs) at night in the equatorial F region is understood in association with plasma bubbles. However, we report BPDs that do not show a connection with bubbles. The characteristics of BPDs are investigated using the observations of the Communication/Navigation Outage Forecasting System (C/NOFS) satellite on 31 December 2008, 28 July 2010, and 1 February 2011. On those days, BPDs are detected in the longitude regions where C/NOFS did not detect bubbles prior to the detection of ... Kil, Hyosub; Lee, Woo; Published by: Geophysical Research Letters      Published on: 07/2014 YEAR: 2013     DOI: 10.1002/grl.50693 Signatures of equatorial plasma bubbles in VHF satellite scintillations and equatorial ionograms Since their discovery in the 1970s, equatorial plasma bubbles (EPBs) have been invoked to explain the propagation of VHF signals on trans-equatorial circuits at night, and blamed for highly detrimental scintillation of VHF and GHz trans-ionospheric communications signals in equatorial regions. Over the last four decades, the properties of EPBs have been deduced by multiple techniques such as incoherent scatter radar, 630 nm airglow, depletions in GPS total electron content observations, VHF and GHz scintillations, and HF ... McNamara, L.; Caton, R.; Parris, R.; Pedersen, T.; Thompson, D.; Wiens, K.; Groves, K.; Published by: Radio Science      Published on: 03/2013 YEAR: 2013     DOI: 10.1002/rds.v48.210.1002/rds.20025 Impacts of atmospheric ultrafast Kelvin waves on radio scintillations in the equatorial ionosphere We present a statistical analysis of the amplitudes of GPS scintillations (S4 index) observed throughout 2008\textendash2010 using the satellite radio occultation measurements of the Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC). Here, for the first time, periodic variability in the occurrence of S4 is investigated using these data. Significant variations of S4 with periods of 2.5\textendash4 days (quasi-3 days) are identified from the observations during postsunset hours (1900\textendas ... Liu, Guiping; Immel, Thomas; England, Scott; Frey, Harald; Mende, Stephen; Kumar, Karanam; Ramkumar, Geetha; Published by: Journal of Geophysical Research: Space Physics      Published on: 02/2013 YEAR: 2013     DOI: 10.1002/jgra.50139 Nonmigrating tidal signatures in the magnitude and the inter-hemispheric asymmetry of the equatorial ionization anomaly Based on nine years of observations from the satellites CHAMP and GRACE the tidal signatures in the magnitude and the inter-hemisphere asymmetry of the equatorial ionization anomaly (EIA) have been investigated in this study. The EIA magnitude parameters show longitudinal wavenumber 4 and 3 (WN4/WN3) patterns during the months around August and December, respectively, while for different EIA parameters the contributions of the various tidal parameters are different. For the crest- to-trough ratio (CTR) the dominating nonm ... Xiong, C.; Lühr, H.; Published by: Annales Geophysicae      Published on: 01/2013 YEAR: 2013     DOI: 10.5194/angeo-31-1115-2013 2012 Equatorial ionosphere responses to two magnetic storms of moderate intensity from conjugate point observations in Brazil Equatorial ionospheric responses during two magnetic storms of moderate intensity are investigated, for the first time, by conjugate point observations in Brazil. The study focuses on storm-induced changes in the evening prereversal vertical drift, thermospheric trans-equatorial winds, spread F/plasma bubble irregularity development, electron density/plasma frequency heights, the EIA strength, and zonal plasma drifts. It is based on data obtained from five Digisondes operated in Brazil, three of them being part of a conju ... Abdu, M.; Batista, I.; Bertoni, F.; Reinisch, B.; Kherani, E.; Sobral, J.; Published by: Journal of Geophysical Research      Published on: 05/2012 YEAR: 2012     DOI: 10.1029/2011JA017174 2010 Coordinated UV imaging of equatorial plasma bubbles using TIMED/GUVI and DMSP/SSUSI Comberiate, Joseph; Paxton, L.; Published by: Space Weather      Published on: Jan-01-2010 YEAR: 2010     DOI: 10.1029/2009SW000546 Neutral density depletions associated with equatorial plasma bubbles as observed by the CHAMP satellite Using CHAMP observations from 2002 to 2005 we investigate neutral density depletions (NDDs) associated with equatorial plasma bubbles (EPBs). The seasonal–longitudinal distribution of NDDs generally follows that of EPBs. However, there are several important differences between them. The maximum NDD occurrence rate is much smaller than the maximum EPB occurrence. NDDs occur at latitudes north and south of the dip equator with an offset of about 15∘, which is collocated with the Appleton anomaly peaks and slightly poleward ... Park, Jaeheung; Lühr, Hermann; Min, Kyoung; Published by: Journal of Atmospheric and Solar-Terrestrial Physics      Published on: YEAR: 2010     DOI: https://doi.org/10.1016/j.jastp.2009.11.003 2009 Formation of a plasma depletion shell in the equatorial ionosphere An accurate description of the irregularity region defined by a plasma bubble is critically important in understanding the dynamics of the region and its effects on radio scintillation. Here we describe a plasma depletion region as a \textquotedblleftdepletion shell\textquotedblright and show how two-dimensional optical images from space can be used to define the shape of the depletion shell. Our simple model calculation demonstrates that the space-based optical observation can detect the plasma-depleted magnetic flux tub ... Kil, Hyosub; Heelis, Roderick; Paxton, Larry; Oh, Seung-Jun; Published by: Journal of Geophysical Research      Published on: 11/2009 YEAR: 2009     DOI: 10.1029/2009JA014369 2008 Wave structures of the plasma density and vertical E$\times$ B drift in low-latitude F region We investigate the seasonal, longitudinal, local time (LT), and altitudinal variations of the F region morphology at low latitudes using data from the first Republic of China satellite (ROCSAT-1), Global Ultraviolet Imager (GUVI), on board the Thermosphere Ionosphere Mesosphere Energetics and Dynamics (TIMED) satellite, and the Defense Meteorological Satellite Program (DMSP) F13 and F15 satellites. Signatures of the longitudinally periodic plasma density structure emerge before 0900 LT. The wave structure is established befo ... Kil, H.; Talaat, E.; Oh, S.-J.; Paxton, L.; England, S.; Su, S.-Y.; Published by: Journal of Geophysical Research      Published on: Jan-01-2008 YEAR: 2008     DOI: 10.1029/2008JA013106 2006 Ionospheric disturbances during the magnetic storm of 15 July 2000: Role of the fountain effect and plasma bubbles for the formation of large equatorial plasma density depletions We investigate the role of the fountain effect and plasma bubbles for the formation of the large equatorial plasma depletions during the geomagnetic storm of 15 July 2000. The large equatorial plasma depletions are detected in the Atlantic sector on the night of the 15th by the Defense Meteorological Satellite Program (DMSP) F15 and the first Republic of China Satellite (ROCSAT-1). The observations show discontinuous drop of the plasma density at the walls of the depletions, flat plasma density inside the depletions, and ... Kil, Hyosub; Paxton, Larry; Published by: Journal of Geophysical Research      Published on: 12/2006 YEAR: 2006     DOI: 10.1029/2006JA011742 Characteristics of the storm-induced big bubbles (SIBBs) Large equatorial plasma depletions, referred to as storm-induced big bubbles (SIBBs), are detected from the Defense Meteorological Satellite Program F15 and from the first Republic of China Satellite during the large magnetic storms of 31 March 2001, 29 October 2003, and 20 November 2003. They occur in the equatorial region at night, are elongated in the north-south direction, have steep walls, and always coexist with plasma bubbles. These observations are consistent with the SIBB characteristics described in the companio ... Kil, Hyosub; Paxton, L.; Su, Shin-Yi; Zhang, Yongliang; Yeh, Hweyching; Published by: Journal of Geophysical Research      Published on: 10/2006 YEAR: 2006     DOI: 10.1029/2006JA011743

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