关于火星对星际冠状质量弹射反应的MAVEN观测
B M Jakosky1, J M Grebowsky2, J G Luhmann3
1University of Colorado, Boulder, CO, USA. bruce.jakosky@lasp.colorado.edu.
概括
由于大气合和离子损失, 火星失去了大气层. 火星大气和挥发性进化 (MAVEN) 任务研究了太阳事件期间的离子逃逸,揭示了可能解释火星薄薄大气的损失率.
科学领域:
- 星球科学
- 大气科学
- 太空物理
背景情况:
- 火星的薄,冷,干燥的大气是由于大气的合和离子流失而造成的.
- 了解持续的离子损失对于理解火星大气的演变至关重要.
研究的目的:
- 通过火星大气和挥发性进化 (MAVEN) 飞船的全面测量来调查离子损失.
- 对火星上层大气层和离子层的星际冠状质量喷射的影响进行分析.
主要方法:
- 火星大气和挥发性进化 (MAVEN) 飞船收集了上层大气和电离层的现场数据.
- 测量是在2015年3月的一次星际冠状物质弹射撞击期间进行的.
- 观察与建模结合以评估离子逃逸率.
主要成果:
- 这项研究观察到弓冲击和磁层的显著变化.
- 形成了广泛的极光,并增强了采集离子.
- 在太阳事件中, 离子逃逸的速度增加.
结论:
- 在太阳活动中,离子流失可能对火星大气层的长期演变作出了重大贡献.
- 早期的太阳活动可能在塑造火星当前大气条件方面发挥了重要作用.
相关概念视频
Momentum And Radiation Pressure
2.6K
An object absorbing an electromagnetic wave would experience a force in the direction of propagation of the wave. This force occurs because electromagnetic waves contain and transport momentum. The force accounts for the wave's radiation pressure exerted on the object. Maxwell's prediction was confirmed in 1903 by Nichols and Hull by precisely measuring radiation pressures with a torsion balance. The measuring instrument had mirrors suspended from a fiber kept inside a glass container.
2.6K
Thomson's e/m Experiment
7.7K
In a beam of charged particles created by a heated cathode, the particles move at different speeds. However, many applications need a beam with uniform particle speeds. An arrangement known as a velocity selector uses electric and magnetic fields to pick particles with a particular speed from the beam.
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The magnetic...
A particle with charge q, speed v, and mass m enters an area from the top, where the magnetic and electric fields are perpendicular both to the particle's motion and to one another. The magnetic...
7.7K
Inductively Coupled Plasma–Mass Spectrometry (ICP–MS): Overview
2.7K
In inductively coupled plasma–mass spectrometry (ICP–MS), an inductively coupled plasma (ICP) torch is used as an atomizer and ionizer. Solid samples are dissolved and volatilized before being introduced into the high-temperature argon plasma, while solution samples are nebulized and passed through the high-temperature argon plasma. Plasma dissociates the analytes and ionizes their component atoms to form a mixture of positive ions and molecular species. The positive ions are then...
2.7K
Impact: Problem Solving
533
In an experiment conducted during a Mars mission, a rover propels a projectile with an initial velocity, and the projectile rebounds after colliding with the Martian surface. To ascertain the maximum height attained by the projectile after this collision, the known restitution coefficient and acceleration due to gravity are employed.
By designating the launch point as the origin and utilizing kinematic equations, the vertical component of the projectile's velocity at the point of impact is...
By designating the launch point as the origin and utilizing kinematic equations, the vertical component of the projectile's velocity at the point of impact is...
533
Schwarzschild Radius and Event Horizon
3.0K
No object with a finite mass can travel faster than the speed of light in a vacuum. This fact has an interesting consequence in the domain of extremely high gravitational fields.
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape...
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape...
3.0K
Acceleration due to Gravity on Other Planets
5.2K
The gravitational acceleration of an object near the Earth's surface is called the acceleration due to gravity. It can be measured by conducting simple experiments on Earth. However, such an experiment is impossible to conduct on the surface of other planets.
Astronomical observations are thus used to measure the acceleration due to gravity on other planets. This can be determined by observing the effect of a planet's gravity on objects close to it. The crucial factor that helps in this...
Astronomical observations are thus used to measure the acceleration due to gravity on other planets. This can be determined by observing the effect of a planet's gravity on objects close to it. The crucial factor that helps in this...
5.2K


