Preliminary Study of The MHD Waves In The Earth's Magnetosheath
Ashgan Mohamed Tawfik Ahmed;
Abstract
It is important to study the interaction of the solar wind with the Earth's magnetosphere; the intended aim of this research was to understand this interaction and its effects on space weather phenomena. Particular attention is paid to the effect of the upstream 3-s waves on the Earth's magnetic field, and the waves propagate in the magnetosheath.
In Chapter ( l) a brief historical overview on the topic, basic concepts and nomenclature are summarized. We reviewed m details the main components of the Earth's magnetosphere and end up the Chapter with summary and open problems.
In Chapter (2) we have constructed a computer code to calculate the strength, the direction, the rotation, and the main variance direction of the data on the components of the Earth's magnetic field using filtered 3-s waves data. The results showed that the eigen-values are all positive and real values. For the global interval and the highly oscillated wave packets (5 samples), these waves are circularly polarized waves with well defined vector (in minimum variance direction u3). They have also parallel propagation, although the angle between (u3 and B) is not zero.
In Chapter (3) we investigated the interaction of the magnetosheath with the rnagnetopause in terms of waves. The function of these waves is to reconfigure the solar wind flow and its frozen-in magnetic field frorn the solar wind state to the state specified by the magnetopause boundary condition.
For simplicity, we calculated the periodicity of one eigen-mode waves
(Alfven waves). These calculations are carried out for two hypothetical cases
In Chapter ( l) a brief historical overview on the topic, basic concepts and nomenclature are summarized. We reviewed m details the main components of the Earth's magnetosphere and end up the Chapter with summary and open problems.
In Chapter (2) we have constructed a computer code to calculate the strength, the direction, the rotation, and the main variance direction of the data on the components of the Earth's magnetic field using filtered 3-s waves data. The results showed that the eigen-values are all positive and real values. For the global interval and the highly oscillated wave packets (5 samples), these waves are circularly polarized waves with well defined vector (in minimum variance direction u3). They have also parallel propagation, although the angle between (u3 and B) is not zero.
In Chapter (3) we investigated the interaction of the magnetosheath with the rnagnetopause in terms of waves. The function of these waves is to reconfigure the solar wind flow and its frozen-in magnetic field frorn the solar wind state to the state specified by the magnetopause boundary condition.
For simplicity, we calculated the periodicity of one eigen-mode waves
(Alfven waves). These calculations are carried out for two hypothetical cases
Other data
| Title | Preliminary Study of The MHD Waves In The Earth's Magnetosheath | Other Titles | دراسة اولية للموجات الهيدروديناميكية المغناطيسة فى منطقة غلاف المجال المغناطيسى الارضى | Authors | Ashgan Mohamed Tawfik Ahmed | Issue Date | 2003 |
Attached Files
| File | Size | Format | |
|---|---|---|---|
| B14514.pdf | 1 MB | Adobe PDF | View/Open |
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