Favorable Conditions for Magnetic Reconnection at Ganymede's Upstream Magnetopause

AbstractThe clear evidence of water erosion on the surface of Mars suggests an early climate much more clement than the present one. Using a model for the origin of inner planet atmospheres by icy planetesimal impact, it is possible to reconstruct the original volatile inventory on Mars, starting from the thin atmosphere we observe today. Evidence for cometary impact can be found in the present abundances and isotope ratios of gases in the atmosphere and in SNC meteorites. If we invoke impact erosion to account for the present excess of129Xe, we predict an early inventory equivalent to at least 7.5 bars of CO2. This reservoir of volatiles is adequate to produce a substantial greenhouse effect, provided there is some small addition of SO2(volcanoes) or reduced gases (cometary impact). Thus it seems likely that conditions on early Mars were suitable for the origin of life – biogenic elements and liquid water were present at favorable conditions of pressure and temperature. Whether life began on Mars remains an open question, receiving hints of a positive answer from recent work on one of the Martian meteorites. The implications for habitable zones around other stars include the need to have rocky planets with sufficient mass to preserve atmospheres in the face of intensive early bombardment.

Download Full-text

A large rotating structure around AB Doradus A at VLBI scale

Proceedings of the International Astronomical Union ◽

10.1017/s1743921319009785 ◽

2019 ◽

Vol 15 (S354) ◽

pp. 189-194

Author(s):

J. B. Climent ◽

J. C. Guirado ◽

R. Azulay ◽

J. M. Marcaide

Keyword(s):

Magnetic Reconnection ◽

Main Sequence ◽

Complex Structure ◽

Main Sequence Star ◽

Polar Cap ◽

Vlbi Observations ◽

Rotating Structure ◽

Source Structure ◽

Expected Position

AbstractWe report the results of three VLBI observations of the pre-main-sequence star AB Doradus A at 8.4 GHz. With almost three years between consecutive observations, we found a complex structure at the expected position of this star for all epochs. Maps at epochs 2007 and 2010 show a double core-halo morphology while the 2013 map reveals three emission peaks with separations between 5 and 18 stellar radii. Furthermore, all maps show a clear variation of the source structure within the observing time. We consider a number of hypothesis in order to explain such observations, mainly: magnetic reconnection in loops on the polar cap, a more general loop scenario and a close companion to AB Dor A.

Download Full-text

Magnetic Reconnection in Plasmas

10.1017/cbo9780511599958 ◽

2000 ◽

Cited By ~ 520

Author(s):

Dieter Biskamp

Keyword(s):

Magnetic Reconnection

Download Full-text

Theoretical sources of the Great White Brotherhood

Ukrainian Religious Studies ◽

10.32420/1997.5.94 ◽

1997 ◽

pp. 20-32

Author(s):

Valeriy Grynko

Keyword(s):

Complex Processes ◽

Local Origin ◽

Favorable Conditions

Complex processes that accompany the formation and development of Ukrainian statehood have created favorable conditions for the spread of neo-religious churches, currents and trends. Most of them are mentally rooted, are spread predominantly owing to the activity of foreign missionaries. Therefore, given the local origin and social resonance, the Great White Brotherhood's phenomenon, whose propagation of faith was carried out and had some success in most of the post-Soviet countries, needs special attention.

Download Full-text

The role of graining in ensuring food security

Agrarian science ◽

10.32634/0869-8155-2020-335-2-75-79 ◽

2020 ◽

pp. 75-79

Author(s):

R. M. Gambarova

Keyword(s):

Food Security ◽

Comparative Analysis ◽

Systems Approach ◽

Point Of View ◽

Government Support ◽

Grain Production ◽

The Government ◽

Favorable Conditions ◽

Grain Farms

Relevance. Grain is the key to strategic products to ensure food security. From this point of view, the creation of large grain farms is a matter for the country's selfsufficiency and it leading to a decrease in financial expense for import. Creation of such farms creates an abundance of productivity from the area and leads to obtaining increased reproductive seeds. The main policy of the government is to minimize dependency from import, create abundance of food and create favorable conditions for export potential.The purpose of the study: the development of grain production in order to ensure food security of the country and strengthen government support for this industry.Methods: comparative analysis, systems approach.Results. As shown in the research, if we pay attention to the activities of private entrepreneurship in the country, we can see result of the implementation of agrarian reforms after which various types of farms have been created in republic.The role of privateentrepreneurshipinthedevelopmentofproduction is great. Тhe article outlines the sowing area, production, productivity, import, export of grain and the level of selfsufficiency in this country from 2015 till 2017.

Download Full-text