Upper_Atmosphere: Recent submissions

Now showing items 201-220 of 941

Holocene climate forcings and lacustrine regime shifts in the Indian summer monsoon realm

Prasad, Sushma; Marwan, Norbert; Goswami, Bedartha; Mishra, Praveen K.; Gaye, Birgit; Anoop, A.; Basavaiah, N.; Stebich, Martina; Jehangir, Arshid (2020)

Extreme climate events have been identified both in meteorological and long‐term proxy records from the Indian summer monsoon (ISM) realm. However, the potential of palaeoclimate data for understanding mechanisms triggering ...
Radio and optical investigations of storm time evolution of post-midnight equatorial plasma bubbles (EPBs) and their drifts over Indian sector

Gurav, O.B.; Sripathi, S.; Ghodpage, R.N. (2020)

We investigated the spatio-temporal evolution of disturbed time post mid-night Equatorial Plasma Bubbles (EPBs) using Canadian Advanced Digital Ionosonde (CADI) located at dip equatorial station, Tirunelveli (8.73 N, 77.7 ...
Multi-wavelength study of energetic processes during solar flare occurrence

Soni, Shirsh Lata; Yadav, Manohar Lal; Gupta, Radhe Shyam; Mishra, Adya Prasad (2020)

This paper is an attempt to understand the physical processes occurring in different layers of the solar atmosphere during a solar flare. For a complete understanding of the flare, we must analyze multiwavelength datasets, ...
Multisatellite MMS analysis of electron holes in the earth's magnetotail: origin, properties, velocity gap, and transverse instability

Lotekar, A.; Vasko, I. Y.; Mozer, F. S.; Hutchinson, I.; Artemyev, A. V.; Bale, S. D.; Bonnell, J. W.; Ergun, R.; Giles, B.; Khotyaintsev, Yu. V.; Lindqvist, P. A.; Russell, C. T.; Strangeway, R. (2020)

We present a statistical analysis of more than 2,400 electrostatic solitary waves interpreted as electron holes (EH) measured aboard at least three Magnetospheric Multiscale (MMS) spacecraft in the Earth's magnetotail. The ...
Daily and monthly variations of the Equatorial Ionization Anomaly (EIA) over the Brazilian sector during the descending phase of the solar cycle 24

Dias, M. A. L.; Fagundes, P. R.; Venkatesh, K.; Pillat, V. G.; Ribeiro, B. A. G.; Seemala, G. K.; Arcanjo, M. O. (2020)

It has been noticed recently that the equatorial ionization anomaly (EIA) in the Brazilian eastern, middle, and western sectors present significant longitudinal variability within a short separation due to the presence of ...
Active (Evolving) phase of equatorial plasma bubbles observed over Tirunelveli

Kakad, Bharati; Gurram, P.; Bhattacharyya, A.; Prasad, D. S. V. V. D (2020)

Usual post-sunset generation of equatorial spread F (ESF) irregularities on quiet days (Q-days) and midnight or post-midnight generation of ESF on magnetically disturbed days (D-days) is widely known. However, the duration ...
Solar wind density control on the prompt penetration electric field and equatorial electrojet

Nilam, B.; Tulasiram, S.; Shiokawa, K.; Balan, N.; Zhang, Q. (2020)

Prompt penetration of convection/over shielding electric fields to equatorial and low latitudes during the southward/northward turnings of interplanetary magnetic field (IMF Bz) have been widely studied in the literature. ...
Storm‐time modeling of the African regional ionospheric total electron content using artificial neural networks

Okoh, Daniel; Habarulema, John Bosco; Rabiu, Babatunde; Seemala, Gopi; Wisdom, Joshua Benjamin; Olwendo, Joseph; Obrou, Olivier; Matamba, Tshimangadzo Merline (2020)

This paper presents the development of a storm‐time total electron content (TEC) model over the African sector for the first time. The storm criterion used was |Dst|≥50 nT and Kp ≥ 4. We have utilized Global Positioning ...
Geomagnetic storm‐induced plasma density enhancements in the southern polar ionospheric region: A comparative study using St. Patrick's Day storms of 2013 and 2015

Shreedevi, P. R.; Choudhary, R. K.; Thampi, Smitha V.; Yadav, Sneha; Pant, T. K.; Yu, Yiqun; McGranaghan, Ryan; Thomas, Evan G.; Bhardwaj, Anil; Sinha, A. K. (2020)

The occurrence of St. Patrick's Day (17 March) geomagnetic storms during two different years(2013 and 2015) with similar solar flux levels but varying storm intensity provided an opportunity to compare and contrast the ...
L-shell and energy dependence of magnetic mirror point of charged particles trapped in Earth’s magnetosphere

Soni, Pankaj K.; Kakad, Bharati; Kakad, Amar (2020)

In the Earth’s inner magnetosphere, there exist regions like plasmasphere, ring current, and radiation belts, where the population of charged particles trapped along the magnetic feld lines is more. These particles keep ...
New class of Ion-acoustic solitons that can exist below critical Mach number

Lakhina, G.S.; Singh, S.V.; Rubia, R (2020)

It is commonly believed that ion-acoustic solitons can only exist above the critical Mach number in a plasma system. A new class of ion-acoustic solitons that can exist below the critical Mach number is reported for the ...
Theory of ion holes in space and astrophysical plasmas

Aravindakshan, Harikrishnan; Yoon, Peter H.; Kakad, Amar; Kakad, Bharati (2020)

Coherent bipolar electric field structures, ubiquitously found in various space and astrophysical plasma environments, play an important role in plasma transport and particle acceleration. Most of the studies found in the ...
Extreme space weather event in 1903 October/November: an outburst from the quiet sun

Hayakawa, Hisashi; Ribeiro, Paulo; Vaquero, José M.; Gallego, María Cruz; Knipp, Delores J.; Mekhaldi, Florian; Bhaskar, Ankush; Oliveira, Denny M.; Notsu, Yuta; Carrasco, Víctor M. S.; Caccavari, Ana; Veenadhari, Bhaskara; Mukherjee, Shyamoli; Ebihara, Yusuke (2020)

While the Sun is generally more eruptive during its maximum and declining phases, observational evidence shows certain cases of powerful solar eruptions during the quiet phase of solar activity. Occurring in the weak Solar ...
Complex space weather events of 2017 September

Hajra, Rajkumar; Tsurutani, Bruce T.; Lakhina, G.S. (2020)

Interplanetary coronal mass ejections (ICMEs), magnetic clouds (MCs), sheaths, corotating interaction regions (CIRs), solar wind high-speed streams (HSSs), fast forward shocks (FSs), reverse waves (RWs), stream interfaces, ...
Oxygen torus and its coincidence with EMIC wave in the deep inner magnetosphere: Van Allen Probe B and Arase observations

Nosé, M.; Matsuoka, A.; Kumamoto, A.; Kasahara, Y.; Teramoto, M.; Kurita, S.; Goldstein, J.; Kistler, L.M.; Singh, S.; Gololobov, A.; Shiokawa, K.; Imajo, S.; Oimatsu, S.; Yamamoto, K.; Obana, Y.; Shoji, M.; Tsuchiya, F.; Shinohara, I.; Miyoshi, Y.; Kurth, W.S.; Kletzing, C.A.; Smith, C.W.; MacDowall, R.J.; Spence, H.; Reeves, G.D. (2020)

We investigate the longitudinal structure of the oxygen torus in the inner magnetosphere for a specifc event found on 12 September 2017, using simultaneous observations from the Van Allen Probe B and Arase satellites. It ...
Randomness in sunspot number: a clue to predict solar cycle 25

Kakad, Bharati; Kumar, Raj; Kakad, Amar (2020)

Forecasting of solar activity is extremely important, due to its impact on our space-based technology. In recent years, we have observed a continuous decline in the peak sunspot number for Solar Cycles (SCs) 21 to 24. We ...
Study of flux-rope characteristics at sub-astronomical-unit distances using the Helios 1 and 2 spacecraft

Raghav, Anil; Gaikwad, Sandesh; Wang, Yuming; Shaikh, Zubair I.; Mishra, Wageesh; Zao, Ake (2020)

Magnetic flux ropes observed as magnetic clouds near 1 au have been extensively studied in the literature and their distinct features are derived using numerous models. These studies summarize the general characteristics ...
Ionospheric disturbances in a large area of the terrestrial globe by two strong solar flares of September 6, 2017, the strongest space weather events in the last decade

Fagundes, P.R.; Pezzopane, M.; Habarulema, J.B.; Venkatesh, K.; Dias, M.A.L.; Tardelli, A.; de Abreu, A.J.; Pillat, V.G.; Pignalberi, A.; Bolzan, M.J.A.; Ribeiro, B.A.G.; Vieira, F.; Raulin, J.P.; Denardini, C.M.; Arcanjo, M.O.; Seemala, G.K. (2020)

On September 6, 2017, the solar active region AR 2673 emitted two solar flares: the first at 08:57 UT (X2.2) and the second at 11:53 UT (X9.3); both were powerful enough to black-out high and low frequency radio waves ...
Electromagnetic ion cyclotron waves pattern recognition based on a deep learning technique: bag-of-features algorithm applied to spectrograms

Medeiros, Claudia; Souza, V.M.; Vieira, L.E.A.; Sibeck, D.G.; Remya, B.; Da Silva, L.A.; Alves, L.R.; Marchezi, J.P.; Jauer, P.R.; Rockenbach, M.; Dal Lago, A.; Kletzing, C.A. (2020)

Several studies have shown the importance of electromagnetic ion cyclotron (EMIC) waves to the pitch angle scattering of energetic particles in the radiation belt, especially relativistic electrons, thus contributing to ...
Nonresonant instability of kinetic Alfvén waves with κ-electrons

Barik, K.C.; Singh, S.V.; Lakhina, G.S. (2020)

A nonresonant instability of kinetic Alfvén waves (KAWs) is studied in a three-component plasma system consisting of background cold ions, an ion beam, and hot electrons with a κ-distribution. The nonresonant KAW instability ...

Now showing items 201-220 of 941

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