scholarly journals From Sun to Earth: Multiscale MHD Simulations of Space Weather

2013 ◽  
pp. 169-176 ◽  
Author(s):  
Tamas I. Gombosi ◽  
Darren L. Dezeeuw ◽  
Clinton P. T. Groth ◽  
Kenneth G. Powell ◽  
C. Robert Clauer ◽  
...  
Keyword(s):  
Space Weather ◽  
Mhd Simulations

Reply to Comments by Tsurutani et al. on “Modeling Extreme ‘Carrington-Type’ Space Weather Events Using Three-Dimensional Global MHD Simulations”

2018 ◽  
Vol 123 (2) ◽  
pp. 1393-1395 ◽  
Author(s):  
Chigomezyo M. Ngwira ◽  
Antti Pulkkinen ◽  
Maria M. Kuznetsova ◽  
Alex Glocer
Keyword(s):  
Space Weather ◽  
Three Dimensional ◽  
Type Space ◽  
Mhd Simulations ◽  
Weather Events

scholarly journals A new technique for observationally derived boundary conditions for space weather

2018 ◽  
Vol 8 ◽  
pp. A26 ◽  
Author(s):  
Paolo Pagano ◽  
Duncan Hendry Mackay ◽  
Anthony Robinson Yeates
Keyword(s):  
Magnetic Field ◽  
Magnetic Flux ◽  
Boundary Conditions ◽  
Space Weather ◽  
Weather Forecasting ◽  
Interplanetary Space ◽  
Time Dependent ◽  
Magnetic Flux Ropes ◽  
Mhd Simulations ◽  
Flux Ropes

Context. In recent years, space weather research has focused on developing modelling techniques to predict the arrival time and properties of coronal mass ejections (CMEs) at the Earth. The aim of this paper is to propose a new modelling technique suitable for the next generation of Space Weather predictive tools that is both efficient and accurate. The aim of the new approach is to provide interplanetary space weather forecasting models with accurate time dependent boundary conditions of erupting magnetic flux ropes in the upper solar corona. Methods. To produce boundary conditions, we couple two different modelling techniques, MHD simulations and a quasi-static non-potential evolution model. Both are applied on a spatial domain that covers the entire solar surface, although they extend over a different radial distance. The non-potential model uses a time series of observed synoptic magnetograms to drive the non-potential quasi-static evolution of the coronal magnetic field. This allows us to follow the formation and loss of equilibrium of magnetic flux ropes. Following this a MHD simulation captures the dynamic evolution of the erupting flux rope, when it is ejected into interplanetary space. Results.The present paper focuses on the MHD simulations that follow the ejection of magnetic flux ropes to 4 R⊙. We first propose a technique for specifying the pre-eruptive plasma properties in the corona. Next, time dependent MHD simulations describe the ejection of two magnetic flux ropes, that produce time dependent boundary conditions for the magnetic field and plasma at 4 R⊙ that in future may be applied to interplanetary space weather prediction models. Conclusions. In the present paper, we show that the dual use of quasi-static non-potential magnetic field simulations and full time dependent MHD simulations can produce realistic inhomogeneous boundary conditions for space weather forecasting tools. Before a fully operational model can be produced there are a number of technical and scientific challenges that still need to be addressed. Nevertheless, we illustrate that coupling quasi-static and MHD simulations in this way can significantly reduce the computational time required to produce realistic space weather boundary conditions.

scholarly journals Modeling extreme “Carrington-type” space weather events using three-dimensional global MHD simulations

2014 ◽  
Vol 119 (6) ◽  
pp. 4456-4474 ◽  
Author(s):  
Chigomezyo M. Ngwira ◽  
Antti Pulkkinen ◽  
Maria M. Kuznetsova ◽  
Alex Glocer
Keyword(s):  
Space Weather ◽  
Three Dimensional ◽  
Type Space ◽  
Mhd Simulations ◽  
Weather Events

scholarly journals A note on using thermally driven solar wind models in MHD space weather simulations

2010 ◽  
Vol 6 (S274) ◽  
pp. 102-104 ◽  
Author(s):  
Jens Pomoell ◽  
Rami Vainio
Keyword(s):  
Solar Wind ◽  
Space Weather ◽  
Weather Forecasting ◽  
Weather Conditions ◽  
Polytropic Index ◽  
Shock Physics ◽  
Space Weather Forecasting ◽  
Mhd Simulations ◽  
Thermally Driven ◽  
Inner Heliosphere

AbstractOne of the challenges in constructing global magnetohydrodynamic (MHD) models of the inner heliosphere for, e.g., space weather forecasting purposes, is to correctly capture the acceleration and expansion of the solar wind. In many current models, the solar wind is driven by varying the polytropic index so that a desired heating is obtained. While such schemes can yield solar wind properties consistent with observations, they are not problem-free. In this work, we demonstrate by performing MHD simulations that altering the polytropic index affects the properties of propagating shocks significantly, which in turn affect the predicted space weather conditions. Thus, driving the solar wind with such a mechanism should be used with care in simulations where correctly capturing the shock physics is essential. As a remedy, we present a simple heating function formulation by which the polytropic wind can be used while still modeling the shock physics correctly.

scholarly journals Large Scale GPU Accelerated PPMLR-MHD Simulations for Space Weather Forecast

2016 ◽  
Author(s):  
Xiangyu Guo ◽  
Binbin Tang ◽  
Jian Tao ◽  
Zhaohui Huang ◽  
Zhihui Du
Keyword(s):  
Space Weather ◽  
Large Scale ◽  
Weather Forecast ◽  
Mhd Simulations

scholarly journals Comment on “Modeling Extreme “Carrington-Type” Space Weather Events Using Three-Dimensional Global MHD Simulations” by C. M. Ngwira, A. Pulkkinen, M. M. Kuznetsova, and A. Glocer”

2018 ◽  
Vol 123 (2) ◽  
pp. 1388-1392 ◽  
Author(s):  
Bruce T. Tsurutani ◽  
Gurbax S. Lakhina ◽  
Ezequiel Echer ◽  
Rajkumar Hajra ◽  
Chinmaya Nayak ◽  
...  
Keyword(s):  
Space Weather ◽  
Three Dimensional ◽  
Type Space ◽  
Mhd Simulations ◽  
Weather Events

Parametric Study of ICME Properties Related to Space Weather Disturbances via a Series of Three-Dimensional MHD Simulations

Solar Physics ◽  
2019 ◽  
Vol 294 (10) ◽  
Author(s):  
Junmo An ◽  
Tetsuya Magara ◽  
Keiji Hayashi ◽  
Yong-Jae Moon
Keyword(s):  
Space Weather ◽  
Parametric Study ◽  
Three Dimensional ◽  
Mhd Simulations

Europe's First Space Weather Think Tank

Space Weather ◽  
2004 ◽  
Vol 2 (4) ◽  
pp. n/a-n/a ◽  
Author(s):  
Anna Belehaki ◽  
Jean Lilensten ◽  
Toby Clark
Keyword(s):  
Space Weather ◽  
Think Tank

The Space Weather Journal: How It Began

Space Weather ◽  
2003 ◽  
Vol 1 (1) ◽  
pp. n/a-n/a ◽  
Author(s):  
Robert Robinson
Keyword(s):  
Space Weather
Sign in / Sign up

Export Citation Format

Share Document