ヴォイジャー1号は,ターミネーションショック領域と,その向こうのヘリオシートを探査しています
E C Stone1, A C Cummings, F B McDonald
1California Institute of Technology, Pasadena, CA 91125, USA. ecs@srl.caltech.edu
まとめ
ヴォイジャー1号はヘリオシェイターに入り,低エネルギー陽子の源である終結ショックを明らかにした. 異常な宇宙線ヘリウムは衝撃時にピークに達せず,以前の予測に異議を唱えた.
科学分野:
- 宇宙物理学の宇宙物理学
- ヘリオフィジックス ヘリオフィジックス
- 惑星科学は惑星科学である.
背景:
- ヴォイジャー1号は2004年12月に太陽の終結ショックを通過した.
- これは,ヘリオスフィアの外層であるヘリオシート (heliosheath) の探査の始まりとなった.
研究 の 目的:
- 終止ショックの性質を分析するために.
- 異常な宇宙線 (ACR) の源を調査する.
主な方法:
- Voyager 1宇宙船によるインシトゥ測定.
- 陽子,電子,ACR,銀河宇宙線のエネルギースペクトルの分析.
主要な成果:
- ターミネーションショックは,特定のエネルギースペクトルを持つ低エネルギー陽子の安定した源 (0.53.5 MeV) である.
- 異常な宇宙線ヘリウムの強度は,衝撃時にピークに達しなかった.
- ~10 MeVの電子,ACR,銀河系宇宙線の強度は,太陽の調節が減少したため,2004年以来増加しています.
結論:
- 終止ショックは弱いショック (速度ジャンプ比 r=2.6) である.
- ACR源は,ボイジャー1号近くの衝撃領域に位置していない.
- ヴォイジャー1号のデータは,ヘリオスフィアの外界と宇宙線の拡散に関する新しい洞察を提供します.
関連する概念動画
Escape Velocity
The escape velocity of an object is defined as the minimum initial velocity that it requires to escape the surface of another object to which it is gravitationally bound and never to return. For example, what would be the minimum velocity at which a satellite should be launched from the Earth's surface such that it just escapes the Earth's gravitational field?
To calculate the escape velocity, it is assumed that no energy is lost to any frictional forces. In practice, a satellite launched from...
To calculate the escape velocity, it is assumed that no energy is lost to any frictional forces. In practice, a satellite launched from...
Travelling Waves
A wave is a disturbance that propagates from its source, repeating itself periodically, and is typically associated with simple harmonic motion. Mechanical waves are governed by Newton's laws and require a medium to travel. A medium is a substance in which a mechanical wave propagates, and the medium produces an elastic restoring force when it is deformed.
Water waves, sound waves, and seismic waves are some examples of mechanical waves. For water waves, the wave propagation medium is water;...
Water waves, sound waves, and seismic waves are some examples of mechanical waves. For water waves, the wave propagation medium is water;...
Zones of Protection
In power systems, the entire setup is divided into protective zones to isolate faults and protect the rest of the network. These zones include generators, transformers, buses, transmission lines, distribution lines, and motors. Each zone can be visualized as a separate room in a house, with each room protected by its own circuit breaker.
Protective zones are defined by closed dashed lines, containing one or more components. A key characteristic of these zones is the strategic placement of...
Protective zones are defined by closed dashed lines, containing one or more components. A key characteristic of these zones is the strategic placement of...
Transition Zone
The transition zone in concrete is a critical area where aggregate meets cement paste, marked by a distinct porosity and weakness compared to the surrounding material. The adhesion around the aggregates is primarily due to Van Der Waals forces. The voids within this zone influence its robustness; initially, it is less durable than the surrounding bulk mortar due to larger voids. Initially, when concrete is compacted, a higher water-cement ratio near the aggregates leads to the formation of...
Survival Tree
Survival trees are a non-parametric method used in survival analysis to model the relationship between a set of covariates and the time until an event of interest occurs, often referred to as the "time-to-event" or "survival time." This method is particularly useful when dealing with censored data, where the event has not occurred for some individuals by the end of the study period, or when the exact time of the event is unknown.
Building a Survival Tree
Constructing a survival tree begins...
Building a Survival Tree
Constructing a survival tree begins...
Planes in Space
A plane in three-dimensional space is fundamentally characterized by a point that lies on the plane and a normal vector that is perpendicular to its surface. This normal vector uniquely determines the orientation of the plane, making it an essential geometric descriptor. In architectural applications, such as the installation of a sloped glass panel on a building façade, this mathematical model provides a precise representation of the panel’s position and orientation in space.Let r₀ be the...


