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Kavutarapu, Venkatesh
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- PublicationRestrictedPreface: Variability and coupling of the equatorial, low- and mid-latitude mesosphere, thermosphere and ionosphere: Latest developments of monitoring and modeling techniquesPreface of the special issue: "Preface: Variability and coupling of the equatorial, low- and mid-latitude mesosphere, thermosphere and ionosphere: Latest developments of monitoring and modeling techniques"
89 4 - PublicationRestrictedStudies on mesosphere, thermosphere and ionosphere from equatorial to mid latitudes – Recent investigations and improvements – Part 1To bring out the recent findings on mesosphere, thermosphere and ionosphere on a common platform, a special issue has been called for, inviting appropriate articles from scientists all over the world. An overwhelming response has been received with a total of more than 100 submissions with principal authors spread over 28 countries. A rigorous review process has been carried out with most of manuscripts reviewed by more than two reviewers. Due to the large number of papers, it was decided to present the special issue in two parts. A total of 29 papers accepted by 30 June 2017 are presented as Part-1 in this issue. Further accepted papers will be published as Part-2, which is expected to be printed in Vol. 61, 2018.
106 8 - PublicationOpen AccessPreface: Studies on mesosphere, thermosphere and ionosphere from equatorial to mid latitudes – Recent investigations and improvements – Part 2This is the second part of a special issue which obtained a significant success: in fact Part 1 (vol. 60(8), 2017) is formed by 29 papers while this part is formed by 28 papers, but the total number of submitted papers was higher than 100. This means that the subjects of research related to mesosphere, thermosphere and ionosphere, from equatorial to mid latitudes, represent hot topics, especially in light of the consequences they have on both ground-based and satellite-based technologies which have by now a crucial role in our life. As it was for Part 1, a rigorous review process has been carried out for each of the papers forming Part 2 of the special issue with most of the manuscripts reviewed by more than two reviewers. Topics investigated were again various: the variability of the plasma during quiet and disturbed conditions, the equatorial ionospheric anomaly, the plasma vertical drift over the equatorial region, multiple stratifications of the F layer, the E region variation under different geomagnetic conditions, the variability of the sporadic E layer, traveling ionospheric disturbances, the ionospheric scintillation variability, the response of the lower ionosphere when artificially disturbed, thermospheric wind changes during geomagnetic disturbed conditions, the mesopause sodium and potassium layer variability, the variability of the midnight values of the OH* temperature in the mesopause region, whistlers and co-seismic ionospheric perturbations.
101 88 - PublicationRestricted
58 2 - PublicationRestrictedGround and satellite-based observations of ionospheric plasma bubbles and blobs at 5.65° latitude in the Brazilian sector(2021)
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; This investigation uses simultaneous observations from all-sky imager system and an ionosonde collocated at Araguatins (5.65° S, 48.07° W and dip-latitude of 4.1° S), a near-equatorial region in Brazil. These simultaneous observations were used to investigate the occurrence of plasma bubbles and blobs in the field of the imaging system and their association with atypical range Spread-F signature in ionograms. Also, in-situ observation of plasma density from Swarm satellites were used to support the ground-based observations. Using a few cases, a methodology will be established to identify in the plasma blobs (atypical ESF) in the ionograms when there is the simultaneous observation of plasma bubbles and blobs in the field of view of the ionosonde. For this purpose, simultaneous sequence of OI 630.0 nm nightglow images and ionograms are presented for different case studies; 1. when there is the absence of a plasma bubble or blob, 2. when there is only the occurrence of plasma bubbles and 3. when there is the occurrence of plasma bubbles and blobs, in order to compare traces in the ionogram in all these case studies. With these we can cover all kinds of signatures in the ionograms corresponding to no irregularities, plasma bubbles only and plasma bubbles-blobs. These OI 630.0 nm nightglow and ionograms recorded simultaneously make it possible to establish a novel methodology to recognize in ionograms cases when there is the occurrence of Spread-F signature associated with bubble-blob in the FOV of the ionosonde.313 2