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Found 5 entries in the Bibliography.
Showing entries from 1 through 5
| 2018 |
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Storm Time Variation of Radiative Cooling by Nitric Oxide as Observed by TIMED-SABER and GUVI The variation of O/N2 (reference to N2 column density 1017\ cm-2) and nitric oxide radiative emission flux exiting the thermosphere have been studied over the Northern Hemisphere during the superstorm event of 7\textendash12 November 2004. The data have been obtained from Global Ultraviolet Imager (GUVI) and Sounding of the Atmosphere using Broadband Emission Radiometry (SABER) on board the National Aeronautics and Space Administration (NASA)\textquoterights Thermosphere, Ionosphere, Mesosphere Energetics and Dynamics (TIMED) satellite. The NO radiative flux is observed to show an anti-correlation with O/N2 on a global scale. Both NO radiative flux and O/N2 ratio show equatorward motion with maximum penetration in western longitude sectors. A local variation of O, O2, and N2 densities have been calculated using NRLMSISE-00 model over a midlatitude location (55\textdegreeN,180\textdegreeE). On a local scale, model calculated O/O2 and O/N2 ratios are found to follow the observations made by GUVI. The collisional excitation of NO with atomic oxygen is the most dominant process for the total cooling rate. The SABER-retrieved NO cooling rate (CR) at a local site suggests an enhancement during the storm period with the peak emission rate closely correlated to the progression of the storm. The peak emission altitude of NO CR moves upward during the main phase of the storm. The NO abundance has been calculated by using cooling rate and Nitric Oxide Empirical Model (NOEM) model. Both these suggest a vary large (3\textendash15 times) increase in NO density during the storm, which is required to account the changes in NO radiative flux. A similar kind of enhancement in NO abundance is also noticed in Student Nitric Oxide Explorer observations during intense geomagnetic storms. Bharti, Gaurav; Sunil~Krishna, M.; Bag, T.; Jain, Puneet; Published by: Journal of Geophysical Research: Space Physics Published on: 01/2018 YEAR: 2018 DOI: 10.1002/2017JA024576 |
| 2011 |
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Trivedi, Richa; Jain, Amit; Jain, Sudhir; Gwal, A.K.; Published by: Advances in Space Research Published on: Jan-11-2011 YEAR: 2011 DOI: 10.1016/j.asr.2011.08.008 |
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Trivedi, Richa; Jain, Amit; Jain, Sudhir; Gwal, A.K.; Published by: Advances in Space Research Published on: Jan-11-2011 YEAR: 2011 DOI: 10.1016/j.asr.2011.08.008 |
| 2010 |
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EC response during severe geomagnetic storms near the crest of equatorial ionization anomaly The responses of the ionosphere near equatorial anomaly crest as observed at Bhopal (geographic 23.2\textdegreeN, 77.4\textdegreeE, and magnetic latitude 14.2\textdegreeN), India for geomagnetic storms during 15 May 2005 (SSC: 0239 hrs UT, SymH: -305 nT) and 24 August 2005 (SSC: 0615 hrs UT, SymH: -179 nT) has been studied using total electron content (TEC). TEC data is recorded by GPS Ionospheric Scintillation and TEC Monitor (GISTM) GSV4004A at Bhopal. The temporal variations of vertical total electron content (VTEC) during these storms were analysed. Fifteen minute average of VTEC is considered for analysis. More than +68\% and +70\% deviation in VTEC was observed for 15 May 2005 and 24 August 2005 storms, respectively, relative to average of five quiet days of the respective months. Significant deviations in VTEC during the main phase of the storms were found to be associated with the prompt penetration of electric fields which originate due to the under-shielding and over-shielding conditions. Peaks like structure in EIA region were observed for both the storms. Peaks like structure well before the fountain effect in EIA region were observed for 15 May 2005. Latitudinal enhancement of anomaly peak in EIA region was also observed for both the storms. Suppressed equatorial electrojet strength and consequently VTEC, observed on 25 August 2005 during recovery phase of the storm, are mainly due to the thermospheric composition changes and also possibly due to the delayed disturbance dynamo electric fields in this region. The range error is also discussed in the present paper. Jain, A.; Tiwari, S.; Jain, S.; Gwal, A.; Published by: Indian Journal of Radio \& Space Physics Published on: 03/2010 |
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EC response during severe geomagnetic storms near the crest of equatorial ionization anomaly The responses of the ionosphere near equatorial anomaly crest as observed at Bhopal (geographic 23.2\textdegreeN, 77.4\textdegreeE, and magnetic latitude 14.2\textdegreeN), India for geomagnetic storms during 15 May 2005 (SSC: 0239 hrs UT, SymH: -305 nT) and 24 August 2005 (SSC: 0615 hrs UT, SymH: -179 nT) has been studied using total electron content (TEC). TEC data is recorded by GPS Ionospheric Scintillation and TEC Monitor (GISTM) GSV4004A at Bhopal. The temporal variations of vertical total electron content (VTEC) during these storms were analysed. Fifteen minute average of VTEC is considered for analysis. More than +68\% and +70\% deviation in VTEC was observed for 15 May 2005 and 24 August 2005 storms, respectively, relative to average of five quiet days of the respective months. Significant deviations in VTEC during the main phase of the storms were found to be associated with the prompt penetration of electric fields which originate due to the under-shielding and over-shielding conditions. Peaks like structure in EIA region were observed for both the storms. Peaks like structure well before the fountain effect in EIA region were observed for 15 May 2005. Latitudinal enhancement of anomaly peak in EIA region was also observed for both the storms. Suppressed equatorial electrojet strength and consequently VTEC, observed on 25 August 2005 during recovery phase of the storm, are mainly due to the thermospheric composition changes and also possibly due to the delayed disturbance dynamo electric fields in this region. The range error is also discussed in the present paper. Jain, A.; Tiwari, S.; Jain, S.; Gwal, A.; Published by: Indian Journal of Radio \& Space Physics Published on: 03/2010 |
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