Upper_Atmosphere: Recent submissions

Now showing items 241-260 of 941

A statistical study on the local time dependence of Equatorial Spread F (ESF) irregularities and their relation to low‐latitude Es layers under geomagnetic storms

Sripathi, S. (2020)

In this paper, we present a study on the local time dependence of equatorial spread F (ESF) irregularities and their relation to low‐latitude Es layers in response to geomagnetic storms using simultaneous observations of ...
On the Co‐Seismic Ionospheric Disturbances (CIDs) in the rapid run ionosonde observations over Allahabad following Mw 7.8 Nepal earthquake on April 25, 2015

Sripathi, S.; Tiwari, Prabhakar (2020)

We present high‐resolution ionosonde observations at Allahabad (25.43°N, 81.84°E) near anomaly crest location in India along with GPS TEC to investigate the possible signatures of co‐seismic disturbances (CIDs) in the ...
Ionospheric responses to the 21 August 2017 great American solar eclipse – A multi-instrument study

Tulasiram, S. (2020)

Herein, we report on the ionospheric responses to a total solar eclipse that occurred on 21 August 2017 over the US region. Ground-based GPS total electron content (TEC) data along with ground-based measurements (Millstone ...
Variations of ion density and temperature as measured by ROCSAT-1satellite over the Indian region and comparison with IRI-2016

Aggarwal, Malini (2019)

Topside ionospheric parameters-total ion density (Ni) and ion temperature(Ti) have 12 been analysed at low latitude region with changing solar activity (years 1999 to 2003).The Ni and Ti data collected from ROCSAT-1 ...
Characteristics of probability distribution functions of low- and high-latitude current systems during Solar Cycle 24

Kakad, Bharati; Kakad, Amar (2019)

Recent solar cycles (SCs) 21–24 have experienced a gradual decrease in their activity with considerable weakening during current SC 24. This is a unique opportunity to examine the long-term response of Earth’s low-latitude ...
Ionospheric perturbations induced by a Very Severe Cyclonic Storm (VSCS): a case study of Phailin VSCS

Singh, Rajesh (2019)

We investigate F region ionospheric perturbations associated with very severe cyclonic storm Phailin which occurred in Bay of Bengal during 09–12 October 2013. Very severe cyclonic storm Phailin was the most intense ...
Evolution of pitch angle-distributed megaelectron Volt electrons during each phase of the geomagnetic storm

Veenadhari, B. (2019)

Using Relativistic Electron Proton Telescope measurements onboard Van Allen Probes, the evolution of electron pitch angle distributions (PADs) during the different phases of magnetic storms is studied. Electron fluxes are ...
Low Frequency (f < 200 Hz) Polar Plasmaspheric Hiss: coherent and intense

Lakhina, G.S. (2019)

t Low frequency (LF) ~22 Hz to 200 Hz plasmaspheric hiss was studied using a year of Polar plasma wave data occurring during solar cycle minimum. The waves are found to be most intense in the noon and early dusk sectors. ...
Three different episodes of prompt equatorial electric field perturbations under steady southward IMF Bz during St. Patrick's day storm

Tulasiram, S.; Veenadhari, B. (2019)

Three different episodes of prompt penetration electric field (PPEF) disturbances are observed during the main phase of the St. Patrick's Day storm on 17 March 2015 under steady southward interplanetary magnetic field (IMF) ...
Capability of geomagnetic storm parameters to identify severe space weather

Tulasiram, S. (2019)

The paper investigates the capability of geomagnetic storm parameters in the disturbance storm-time (Dst), Kp, and AE indices to distinguish between severe space weather (SvSW) that causes the reported electric power outages ...
Mapping the impact of non tectonic forcing mechanisms on GNSS measured coseismic ionospheric perturbations

Bagiya, Mala S.; Ponraj, S. (2019)

Global Navigation Satellite System (GNSS) measured Total Electron Content (TEC) is now widely used to study the near and far-field coseismic ionospheric perturbations (CIP). The generation of near field (~500–600km surrounding ...
A neural network‐based ionospheric model over Africa from Constellation Observing System for meteorology, ionosphere, and climate and ground Global Positioning System observations

Seemala, Gopi K (2019)

The first regional total electron content (TEC) model over the entire African region (known as AfriTEC model) using empirical observations is developed and presented. Artificial neural networks were used to train TEC ...
Observation of very short period atmospheric gravity waves in the lower ionosphere using very low frequency waves

Singh, Rajesh (2019)

We present observations of very short period (<5 min) wavy fluctuations (WFs) in the lower ionosphere (75–85 km) on the night of 21 January 2016, using subionospherically propagating very low frequency signals. Four out ...
Concurrent effect of Alfven waves and planar magnetic structure on geomagnetic storms

Vichare, Geeta (2019)

Generally, interplanetary coronal mass ejection (ICME) triggers intense and strong geomagnetic storms. It has been established that the ICME sheath-moulded planar magnetic structure enhances the amplitude of the storms. ...
Storm-time mesoscale field-aligned currents and interplanetary parameters

Vichare, Geeta; Sinha, A.K. (2019)

Present paper studies Field aligned currents (FACs) estimated by employing Ampere's law to the magnetic field recorded by CHAMP satellite during 24 geomagnetic storms. Low-pass filtered FACs with a cutoff period of 20 s ...
IpsDst of Dst Storms Applied to Ionosphere‐ Thermosphere Storms and Low‐Latitude Aurora

Tulasiram, S (2019)

Conventionally, the minimum value of Dst (DstMin) and maximum values of Kp and AE (Kpmax and AEmax) representing the geomagnetic storm intensities have been used for investigating space weather in Earth's environment. The ...
What Fraction of the Outer Radiation Belt Relativistic Electron Flux at L ≈ 3‐4.5 Was Lost to the Atmosphere During the Dropout Event of the St. Patrick's Day Storm of 2015?

Sinha, A.K. (2019)

Observations of relativistic energetic electron fluxes in the outer radiation belt can show dropouts, that is, sudden electron flux depletions during the main phase of a geomagnetic storm. Many recent studies show that ...
Resonant instabilities of kinetic Alfven waves in the Earth’s magnetosphere with superthermal electrons

Singh, S V; Lakhina, G.S. (2019)

A theoretical plasma model for the generation of kinetic Alfv en waves (KAWs), having background Maxwellian ions, j-electrons, and drifting Maxwellian beam ions, is discussed. The ion beam streams along the ambient magnetic ...
Comment on “First Observation of Mesosphere Response to the Solar Wind High‐Speed Streams” by W. Yi et al.

Lakhina, G S (2019)

While Yi, Reid, Xue, Younger, Spargo, et al. (2017, http://doi:10.1002/2017JA024446) described the observational results showing solar wind high‐speed stream (HSS) impacts on the mesosphere over Antarctica, the specific ...
Coexistence of a planar magnetic structure and an Alfven wave in the shock-sheath of an interplanetary coronal mass ejection

Shaikh, Zubair; Vichare, Geeta (2019)

The excess speed of coronal mass ejection over the ambient solar wind in interplanetary space generates a highly compressed, heated and turbulent shock-sheath. Here, for the first time, we present in situ observations ...

Now showing items 241-260 of 941

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