scholarly journals JGR: Space Physics Seeks Submissions on Underrepresented Topics

Eos ◽  
2020 ◽  
Vol 101 ◽  
Author(s):  
Michael Balikhin
Keyword(s):  
Numerical Models ◽  
Solar Physics ◽  
Space Physics ◽  
Space Instrumentation ◽  
Geophysical Research ◽  
Scientific Papers

Under a new editor in chief, the Journal of Geophysical Research: Space Physics is encouraging more scientific papers on space instrumentation, numerical models, and solar physics.

scholarly journals Astronomical Research and Outreach in Georgia

2018 ◽  
Vol 2 (1) ◽  
pp. 115-123
Author(s):  
M. Todua ◽  
Keyword(s):  
Solar Physics ◽  
Space Physics ◽  
State University ◽  
Research Education ◽  
Research Institution ◽  
Near Space ◽  
Wide Range ◽  
Solar System Bodies ◽  
Astronomical Research ◽  
Under Construction

Interest in astronomy has been significantly increased in Georgia. As a result, the development of astronomical research, education and public outreach are in progress. In Abastumani Astrophysical Observatory - a research institution at Ilia State University - the observational and theoretical studies comprise a wide range of topics in astronomy and adjacent fields: solar system bodies, solar physics, stellar and extragalactic astronomy, theoretical astrophysics, cosmology, atmospheric and near space physics. Georgian scientists are involved in wide international collaboration and participate in a number of networks and projects. Astronomical education at bachelor, master and doctoral levels are held at Ilia University. PhD programs are also offered at other universities. In 2018, under the financial support of the World Bank and Georgian government, the renovation of Abastumani Observatory has been started. International conferences and workshops have been carried out in Georgia. Excursions at the Observatory and public lectures in astronomy throughout the country are carried out. Amateur astronomers organize astronomical events. A private observatory is under construction near Tbilisi. All these puts better perspective for future development of astronomy in Georgia.

Impact of salt marsh and seagrass beds on the sediemnt buget and resilience of coatsal areas

2020 ◽  
Author(s):  
Nicoletta Leonardi ◽  
Carmine Donatelli ◽  
Xiahoe Zhang ◽  
Neil Ganju ◽  
Sergio Fagherazzi
Keyword(s):  
Salt Marsh ◽  
Water Resources ◽  
Salt Marshes ◽  
Numerical Models ◽  
Sediment Budget ◽  
Coastal Protection ◽  
Seagrass Beds ◽  
Geophysical Research ◽  
Coastal System ◽  
Depositional Patterns

<p>Salt marshes and seagrass beds can offer sustainable coastal protection solutions and several ecosystem co-benefits. The delicate balance regulating salt marsh stability depends on several factors including the sediment added to and removed from the coastal system (<em>Donatelli et al., 2018, 2019; Zhang et al., 2019</em>).  Despite the importance of these sediment budget dynamics, many feedbacks between salt marsh presence and sediment availability are still unclear. Here, we use numerical models to simulate changes in depositional patterns of six estuaries along the U.S. coastline to investigate how salt marsh and seagrass beds removal and restoration can alter the sediment budget and resilience of coastal environments. </p><p><em>Donatelli, C., Ganju, N.K., Kalra, T.S., Fagherazzi, S. and Leonardi, N., 2019. Changes in hydrodynamics and wave energy as a result of seagrass decline along the shoreline of a microtidal back-barrier estuary. Advances in Water Resources, 128, pp.183-192.</em></p><p><em>Zhang, X., Leonardi, N., Donatelli, C. and Fagherazzi, S., 2019. Fate of cohesive sediments in a marsh-dominated estuary. Advances in water resources, 125, pp.32-40.</em></p><p><em>Donatelli, C., Ganju, N.K., Fagherazzi, S. and Leonardi, N., 2018. Seagrass impact on sediment exchange between tidal flats and salt marsh, and the sediment budget of shallow bays. Geophysical Research Letters, 45(10), pp.4933-4943.</em></p>

scholarly journals QUATERNARY PALAEOGEOGRAPHY AT THE LVIV UNIVERSITY: MAIN ACHIEVEMENTS IN THE XXI CENTURY AND PROSPECTS

2020 ◽  
pp. 30-70 ◽  
Author(s):  
Andriy Bogucki ◽  
Olena Tomeniuk ◽  
Andriy Yatsyshyn ◽  
Roman Dmytruk
Keyword(s):  
River Valley ◽  
Quaternary Sediments ◽  
Geophysical Research ◽  
Quaternary Period ◽  
River Terraces ◽  
Scientific Papers ◽  
National University ◽  
Western Ukraine ◽  
History Of ◽  
Close Cooperation

The Department of Geomorphology and Palaeogeography of the Faculty of Geography at the Ivan Franko National University of Lviv employs a group of palaeogeographers (A. Bogucki, O. Tomeniuk, A. Yatsyshyn, R. Dmytruk), which comprehensively studies Quaternary sediments in Western Ukraine and other territories of the country. The thematic focus of palaeogeographic research is very diversified: the study of key sections of Quaternary sediments; conditions of formation and structure of periglacial loess-palaeosol sequences; research of the deposits of the glacial complex; periglacial processes and forms; the role of tectonics in the formation of Quaternary sediments; interdisciplinary research of the Palaeolithic; engineering and geological investigations; geophysical research; mineralogical research; weathering of anhydrite; study of the Holocene stage of the formation of the Dnister River valley; river terraces; lithology of alluvium; study of the Vyshnia River valley; malacological research; research of travertines, history of geography, etc. The selected issues are a priority research topic of the palaeogeographic group of the Department of Geomorphology and Palaeogeography. On the occasion of the 70th anniversary of the department, an attempt to summarize the scientific achievements of palaeogeographers over the past twenty years, particularly in thematic directions of research, was made. A large amount of new original factual material has been received, a significant number of international and Ukrainian scientific grants have been implemented, ten PhD students have defended their theses and received a PhD degree, more than 500 scientific papers have been published, more than half of which are in European Union languages. Due to the limited scope of this article, the greatest attention among all of the publications is paid to selected monographic works, collections of scientific papers prepared by researchers, papers in the journals from Scopus and Web of Science databases, and some others. It is worth mentioning the close cooperation of palaeogeographers of the Faculty of Geography with researchers from Ukraine, Poland, Belarus, Lithuania, France, Belgium and other countries. Without doubts, there are all the reasons to talk about a progressive palaeogeographic school at the Faculty of Geography, whose work is gaining momentum. Key words: palaeogeography; key sections; loess-palaeosol sequence; Quaternary period; periglacial processes; Palaeolithic.

Global structure and properties of ULF waves in the ion foreshock observed in a Hybrid-Vlasov simulation.

2021 ◽  
Author(s):  
Kun Zhang ◽  
Seth Dorfman ◽  
Urs Ganse ◽  
Lucile Turc ◽  
Chen Shi
Keyword(s):  
Space Physics ◽  
Ulf Waves ◽  
Ion Distribution ◽  
Geophysical Research ◽  
Energetic Ions ◽  
Ultralow Frequency ◽  
Ulf Wave ◽  
Wave Normal ◽  
The Waves ◽  
Wave Properties

<p>Energetic ions reflected and accelerated by the Earth’s bow shock travel back into the solar wind, forming the ion foreshock, and generate ultralow frequency (ULF) waves. Such ULF waves have been extensively studied over the past few decades using satellite measurements. However, the spatial variations of the wave properties cannot be well resolved by satellite observations due to the limited number of available spacecraft simultaneously inside the ion foreshock. Therefore, we conduct a global survey of the ULF wave properties in the ion foreshock through analysis of a Vlasiator (a hybrid-Vlasov code) simulation. Previous studies validated that this simulation well reproduced Earth’s foreshock and the ULF waves in it [e.g., Palmroth et al., 2015; Turc et al., 2018]. Here we focus on the wave properties, including frequency, ellipticity, polarization, wave normal angle and growth rate, of the well-known 30-sec wave and its multiple harmonics. We report that the ULF waves near the edge of the foreshock are very different from the waves in the center of the foreshock. We also show the related ion distribution and discuss the connection between the observed ion beams and ULF waves, aiming at understanding the cause of the observed differences in wave properties.</p><p> </p><p>This study is supported by NASA grant 80NSSC20K0801. Vlasiator is developed by the European Research Council Starting grant 200141-QuESpace, and Consolidator grant GA682068-PRESTISSIMO received by the Vlasiator PI. Vlasiator has also received funding from the Academy of Finland. See www.helsinki.fi/vlasiator</p><p> </p><p>Palmroth, M., et al. (2015), ULF foreshock under radial IMF: THEMIS observations and global kinetic simulation Vlasiator results compared, J. Geophys. Res. Space Physics, 120, 8782–8798, doi:10.1002/2015JA021526.</p><p>Turc, L., Ganse, U., Pfau-Kempf, Y., Hoilijoki, S., Battarbee, M., Juusola, L., et al. (2018). Foreshock properties at typical and enhanced interplanetary magnetic field strengths: results from hybrid-Vlasov simulations. Journal of Geophysical Research: Space Physics, 123, 5476–5493. doi:10.1029/2018JA025466.</p>

Atmospheric Escape Processes and Planetary Atmospheric Evolution: from misconceptions to challenges

2020 ◽  
Author(s):  
Guillaume Gronoff ◽  
Phil Arras ◽  
Suleiman Baraka ◽  
Jared M Bell ◽  
Gael Cessateur ◽  
...  
Keyword(s):  
A Priori ◽  
Careful Analysis ◽  
Space Physics ◽  
Habitable Zone ◽  
M Dwarfs ◽  
Geophysical Research ◽  
Atmospheric Evolution ◽  
Atmospheric Escape ◽  
Surface Location ◽  
New Criteria

<p>The recent discoveries of telluric exoplanets in the habitable zone of different stars have led to questioning the nature of their atmosphere, which is required to determine their habitability. Atmospheric escape is one of the challenging problems to be solved: simply adapting what is currently observed in the solar system is doomed to fail due to the large variations in the conditions encountered around other stars. A better strategy is to review the different processes that shaped planetary atmospheres and to evaluate their importance depending upon the stellar conditions. This approach allowed us to show that processes like ion-pickup were a more important way to lose atmosphere at Mars in the past. </p> <p>We reviewed the different escape mechanisms and their magnitude in function of the different conditions. This led us to discover discrepancies in the current literature concerning problems such as the Xenon paradox or the importance of a magnetic field in protecting an atmosphere.<br />This shows that one should be very careful before claiming the presence of an atmosphere on planets in the habitable zone of their M-dwarfs: new criteria such as the Alfven surface location with respect to the planet should be taken into account a-priori.<br />Overall, the habitability of a planet should not be claimed only on by its location in the habitable zone but also after careful analysis of the interaction between its atmosphere and its parent star [Gronoff et al. 2020]. </p> <p> </p> <p><br /> Gronoff, G., Arras, P., Baraka, S., Bell, J. M., Cessateur, G., Cohen, O., et al. ( 2020). Atmospheric Escape Processes and Planetary Atmospheric Evolution. Journal of Geophysical Research: Space Physics, 125, e2019JA027639. https://doi.org/10.1029/2019JA027639 </p>

scholarly journals VisAn MHD: a toolbox in Matlab for MHD computer model data visualisation and analysis

2007 ◽  
Vol 25 (3) ◽  
pp. 779-784 ◽  
Author(s):  
P. Daum
Keyword(s):  
Observational Data ◽  
Numerical Models ◽  
Space Physics ◽  
Space Environment ◽  
Complex Structures ◽  
Mhd Simulations ◽  
Analysis Package ◽  
Point To Point ◽  
The Many

Abstract. Among the many challenges facing modern space physics today is the need for a visualisation and analysis package which can examine the results from the diversity of numerical and empirical computer models as well as observational data. Magnetohydrodynamic (MHD) models represent the latest numerical models of the complex Earth's space environment and have the unique ability to span the enormous distances present in the magnetosphere from several hundred kilometres to several thousand kilometres above the Earth surface. This feature enables scientist to study complex structures of processes where otherwise only point measurements from satellites or ground-based instruments are available. Only by combining these observational data and the MHD simulations it is possible to enlarge the scope of the point-to-point observations and to fill the gaps left by measurements in order to get a full 3-D representation of the processes in our geospace environment. In this paper we introduce the VisAn MHD toolbox for Matlab as a tool for the visualisation and analysis of observational data and MHD simulations. We have created an easy to use tool which is capable of highly sophisticated visualisations and data analysis of the results from a diverse set of MHD models in combination with in situ measurements from satellites and ground-based instruments. The toolbox is being released under an open-source licensing agreement to facilitate and encourage community use and contribution.

On the flow of geomagnetically induced currents in an electric power transmission network

2010 ◽  
Vol 88 (5) ◽  
pp. 357-363 ◽  
Author(s):  
Risto J. Pirjola
Keyword(s):  
Electric Power ◽  
Power Transmission ◽  
Power Grid ◽  
Space Physics ◽  
Practical Significance ◽  
Test Model ◽  
Geomagnetically Induced Currents ◽  
Geophysical Research ◽  
Model Calculations ◽  
Induced Currents

Geomagnetically induced currents (GICs) in conductor networks are among the ground-level effects of space weather. GICs are a possible source of problems to the system. Today, electric power transmission grids are the most important concern regarding GICs, which may in the worst cases lead to blackouts in large areas and permanent damage to transformers. The evaluation of GIC risks and the design of possible countermeasures require estimation of expected GIC magnitudes in transformers. This can be achieved by model calculations supplemented by GIC recordings at some sites. Although in principle GICs can flow all over a large galvanically-connected power grid, which should thus be included as a whole in a GIC calculation, the network must usually be restricted somehow in practical computations of GICs. By using a power grid test model, this paper provides a systematic numerical investigation showing that GICs do not flow over very long distances in a power grid, which is a good result and justifies the neglect of the parts of the network that lie far away from the area of primary interest. Besides practical significance in electric power engineering, studies of GICs can be used for space physics and geophysical research as well. It is also important to understand the features of the flow pattern of GICs in a network.

scholarly journals Astrophysical processes on the Sun

2012 ◽  
Vol 370 (1970) ◽  
pp. 3043-3048
Author(s):  
Clare E. Parnell
Keyword(s):  
Plasma Physics ◽  
Spectral Resolution ◽  
Spectroscopic Data ◽  
Numerical Models ◽  
Solar Physics ◽  
Parallel Computers ◽  
Space Missions ◽  
The Sun ◽  
Theme Issue ◽  
The Past

Over the past two decades, there have been a series of major solar space missions, namely Yohkoh, SOHO, TRACE, and in the past 5 years, STEREO, Hinode and SDO, studying various aspects of the Sun and providing images and spectroscopic data with amazing temporal, spatial and spectral resolution. Over the same period, the type and nature of numerical models in solar physics have been completely revolutionized as a result of widespread accessibility to parallel computers. These unprecedented advances on both observational and theoretical fronts have led to significant improvements in our understanding of many aspects of the Sun's behaviour and furthered our knowledge of plasma physics processes that govern solar and other astrophysical phenomena. In this Theme Issue, the current perspectives on the main astrophysical processes that shape our Sun are reviewed. In this Introduction, they are discussed briefly to help set the scene.

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