scholarly journals Lagrange point stability for a rotating host mass binary

2020 ◽  
Vol 102 (2) ◽  
Author(s):  
Martin D. Strong ◽  
Michael Crescimanno
Keyword(s):  
Lagrange Point

Prediction of the Dst Geomagnetic Index Using Adaptive Methods

2021 ◽  
Vol 3 ◽  
pp. 38-46
Author(s):  
I. N. Myagkova ◽  
◽  
V. R. Shirokii ◽  
R. D. Vladimirov ◽  
O. G. Barinov ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Neural Networks ◽  
Time Series ◽  
Solar Wind ◽  
Artificial Neural Networks ◽  
Adaptive Methods ◽  
Gradient Boosting ◽  
Multilayer Perceptrons ◽  
Lagrange Point ◽  
Geomagnetic Index

The potential is investigated of predicting the time series of the Dst geomagnetic index using various adaptive methods: artificial neural networks (classical multilayer perceptrons), decision trees (random forest), gradient boosting. The prediction is based on the parameters of the solar wind and interplanetary magnetic field measured at the Lagrange point L1 in the ACE spacecraft experiment. It is shown that the best prediction skill of the three adaptive methods is demonstrated by gradient boosting.

scholarly journals Space-based geoengineering: Challenges and requirements

2009 ◽  
Vol 224 (3) ◽  
pp. 571-580 ◽  
Author(s):  
C R McInnes
Keyword(s):  
Climate Change ◽  
Carbon Dioxide ◽  
Large Scale ◽  
Climate Model ◽  
Carbon Dioxide Concentration ◽  
Complex Solution ◽  
Lagrange Point ◽  
Simple Climate Model ◽  
Earth’S Climate

The prospect of engineering the Earth's climate (geoengineering) raises a multitude of issues associated with climatology, engineering on macroscopic scales, and indeed the ethics of such ventures. Depending on personal views, such large-scale engineering is either an obvious necessity for the deep future, or yet another example of human conceit. In this article a simple climate model will be used to estimate requirements for engineering the Earth's climate, principally using space-based geoengineering. Active cooling of the climate to mitigate anthropogenic climate change due to a doubling of the carbon dioxide concentration in the Earth's atmosphere is considered. This representative scenario will allow the scale of the engineering challenge to be determined. It will be argued that simple occulting discs at the interior Lagrange point may represent a less complex solution than concepts for highly engineered refracting discs proposed recently. While engineering on macroscopic scales can appear formidable, emerging capabilities may allow such ventures to be seriously considered in the long term. This article is not an exhaustive review of geoengineering, but aims to provide a foretaste of the future opportunities, challenges, and requirements for space-based geoengineering ventures.

Sign in / Sign up

Export Citation Format

Share Document