The distant future of solar activity: A case study of Beta Hydri. II - Chromospheric activity and variability

1993 ◽  
Vol 403 ◽  
pp. 396 ◽  
Author(s):  
D. Dravins ◽  
P. Linde ◽  
K. Fredga ◽  
G. F. Gahm
Keyword(s):  
Solar Activity ◽  
Distant Future ◽  
Chromospheric Activity

The distant future of solar activity: A case study of Beta Hydri. III - Transition region, corona, and stellar wind

1993 ◽  
Vol 403 ◽  
pp. 412 ◽  
Author(s):  
D. Dravins ◽  
P. Linde ◽  
T. R. Ayres ◽  
J. L. Linsky ◽  
B. Monsignori-Fossi ◽  
...  
Keyword(s):  
Solar Activity ◽  
Transition Region ◽  
Stellar Wind ◽  
Distant Future

scholarly journals Postmidnight equatorial plasma irregularities on the June solstice during low solar activity – a case study

2019 ◽  
Vol 37 (4) ◽  
pp. 657-672
Author(s):  
Claudia M. N. Candido ◽  
Jiankui Shi ◽  
Inez S. Batista ◽  
Fabio Becker-Guedes ◽  
Emília Correia ◽  
...  
Keyword(s):  
Solar Activity ◽  
Low Latitude ◽  
Plasma Irregularities ◽  
Fabry Perot ◽  
June Solstice ◽  
Spread F ◽  
Plasma Depletions ◽  
Dip Angle ◽  
Layer Peak

Abstract. We present a case study of unusual spread-F structures observed by ionosondes at two equatorial and low-latitude Brazilian stations – São Luís (SL: 44.2∘ W, 2.33∘ S; dip angle: −6.9∘) and Fortaleza (FZ: 38.45∘ W, 3.9∘ S; dip angle: −16∘). The irregularity structures observed from midnight to postmidnight hours of moderate solar activity (F10.7 < 97 sfu, where 1 sfu = 10−22 W m−2 s−1) have characteristics different from typical post-sunset equatorial spread F. The spread-F traces first appeared at or above the F-layer peak and gradually became well-formed mixed spread F. They also appeared as plasma depletions in the 630.0 nm airglow emissions made by a wide-angle imager located at the nearby low-latitude station Cajazeiras (CZ: 38.56∘ W, 6.87∘ S; dip angle: −21.4∘). The irregularities appeared first over FZ and later over SL, giving evidence of an unusual westward propagation or a horizontal plasma advection. The drift-mode operation available in one of the ionosondes (a digital portable sounder, DPS-4) has enabled us to analyze the horizontal drift velocities and directions of the irregularity movement. We also analyzed the neutral wind velocity measured by a Fabry–Pérot interferometer (FPI) installed at CZ and discuss its possible role in the development of the irregularities.

Impact of solar activity on the growth of pine trees: case study

2014 ◽  
Vol 133 (4) ◽  
pp. 639-648 ◽  
Author(s):  
Ivan Dorotovič ◽  
José Luis Louzada ◽  
José Carlos Rodrigues ◽  
Vladimír Karlovský
Keyword(s):  
Solar Activity ◽  
Pine Trees

scholarly journals  Expected impacts of climate change on forests: Czech Republic as a case study

2011 ◽  
Vol 57 (No. 10) ◽  
pp. 422-431 ◽  
Author(s):  
T. Hlásny ◽  
J. Holuša ◽  
ŠtěpánekP ◽  
TurčániM ◽  
SitkováZ ◽  
...  
Keyword(s):  
Czech Republic ◽  
Forest Tree ◽  
Forest Vegetation ◽  
Limiting Factor ◽  
The Czech Republic ◽  
Distant Future ◽  
Vegetation Season ◽  
Fundamental Information ◽  
Near Future

&nbsp; We provide fundamental information about the future development of selected climate elements in relation to anticipated threat to forests in the Czech Republic. All analyses were carried out in relation to four elevation zones with specific potential forest vegetation &ndash; up to 350 m a.s.l. (oak dominance), 350&ndash;600 m a.s.l. (beech dominance), 600&ndash;900 m a.s.l. (beech-fir dominance), 900&ndash;1,100 m a.s.l. (spruce dominance). We found out that while the projected increase in mean annual air temperature is almost constant over the Czech Republic (+3.25&ndash;3.5&deg;C in the distant future), the frequency of heat spells at lower elevations is expected to increase dramatically compared to higher elevations. The precipitation totals during the vegetation season are projected to increase in the near future by up to 10% and to decrease in the distant future by up to 10% over all vegetation zones. In general, drought is presumed to become a key limiting factor at lower elevations, while increased temperature along with the prolonged vegetation season at higher elevations can be beneficial to forest vegetation. Consequently, northward progression of forest tree species and retraction of the species lower distribution range are a generic response pattern. Such impacts are presumed to be accompanied by changes in the distribution and population dynamics of pests and pathogens. Mainly the impacts on two key forest pests, Ips typographus and Lymantria dispar, are discussed. &nbsp;

scholarly journals Emerging Nigerian Megacities and Sustainable Development: Case Study of Lagos and Abuja

2016 ◽  
Vol 9 (2) ◽  
pp. 27 ◽  
Author(s):  
Ajah Ekpeni Obia
Keyword(s):  
New York ◽  
Urban Design ◽  
Green Building ◽  
The Other ◽  
Distant Future ◽  
Economic Productivity ◽  
Two Cities ◽  
Sustainability Principles ◽  
Global Energy Consumption

<p>It is estimated that by 2020 half of Nigerians shall live in urban centres. Nigeria has scores of such centres, with many showing the tendency of becoming megacities in a no distant future. One of these cities, Lagos (already a megacity), shall by projection, have a population of 24 million persons by 2020. The other, Abuja, is one of the fastest growing cities on earth. Generally, the world is now known to parade far larger cities than history has ever recorded. Some of these cities are quite magnificent and glorious - London, Paris, Tokyo and New York. On the other hand, Lagos and Mumbai are classic examples of urban failures. What separate the two classes of cities are the approaches to the design of their urban fabrics and management of their ecology. Whereas the former cities have adopted robust sustainability principles in their architecture and urban design/regeneration as well as efficient urban management programmes, the latter appear to be partially or totally non-committal. This paper examines the evolving Nigerian mega cities and their potentials for sustainable survival, with particular reference to Lagos and Abuja, using indices of economic productivity, social equity and environmental concerns. The result shows that the two cities failed these sustainability tests. The cause is traceable to unsustainable architecture being practiced. About half of the total global energy consumption comes from buildings. Eco-design prescriptions of the architect would guarantee urban sustainability. Thus, this paper recommends a national green building code for Nigeria.</p>

scholarly journals Temporality of agency in regional development

2021 ◽  
pp. 096977642110288
Author(s):  
Markus Grillitsch ◽  
Bjørn Asheim ◽  
Hjalti Nielsen
Keyword(s):  
Regional Development ◽  
Economic Geography ◽  
Regional Studies ◽  
Distant Future ◽  
Different Types ◽  
Short And Long Term ◽  
Long Term Consequences ◽  
Development Outcomes

The temporality of agency plays a fundamental role in regional development but has received little attention in economic geography and regional studies. This paper zooms in on two aspects of temporality: the temporality of intentions and the temporality of consequences. The former refers to actors’ perception and valuation of opportunities in the near and distant future, whereas the latter refers to the short- and long-term consequences of actions. This paper studies the temporality of agency in the context of regional development. It investigates how short- and long-term intentions motivate different types of agency, how different types of agency affect short- and long-term regional development outcomes and which conditions enable or constrain different types of agency. We illustrate our arguments with an in-depth case study covering the regional development of a labour market in Norway over the last 20 years.

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