Naslov
The Drag-Based Modeling

Autori
Žic, Tomislav

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Skup
Heliophysics 2050 Workshop 2021

Mjesto i datum
Houston (TX), Sjedinjene Američke Države, 03.05.2021. - 07.05.2021

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
fizika Sunca ; interplanetarni prostor ; svemirska prognostika
(solar physics ; heliophysics ; inteplanetary space ; space weather)

Sažetak
The space weather tools are used for forecasting the spreading and arrival of Interplanetary Coronal Mass Ejections (ICMEs) at designated positions in the interplanetary (IP) space. Many of models are developed or still in a development phase. The drag-based model employs the hypothesis that after CME launch the Lorentz force ceases in the upper corona and that drag between solar wind and CME dominates in the interplanetary space. The basis of the hypothesis relies on the fact that the CME which is faster than the solar wind decelerates, whereas slower one accelerates. The drag-based kinematics is depended on the CME speed relative to the solar wind speed. It is expected to be the case in the interplanetary collisionless environment. The simple drag-based model utilizes the assumption of constant solar-wind speed and constant drag parameter. Under these assumptions, the drag-based kinematics can be solved analytically. The analytical solution gives fast forecasting calculation of the arrival time and speed of CME to any coordinate in the heliosphere. The basic DBM model forecasts only straightforward motion of the ICME in the IP environment. Further development included geometric expansion using constant cone-like ICME shape. In that case the initial shape only broadens during its propagation. The continuation of my work introduced analysis in which initial cone-like shape flattens during its kinematics. The leading edge flattens under the influence of the perturbed and radially dependent solar wind to the ICME leading rim. Next step was the introduction of a time dependent and perturbed IP environment into the model. The enhancement examines the possibility of application in various cases, such as automatic least-square fitting on initial CME kinematic data suitable for a real-time forecasting of CME kinematics, or combining the DBM into advanced numerical simulations of the interplanetary ambient conditions.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

POVEZANOST RADA