Video Experimental Relacionado
Updated: Jul 8, 2026
11:34
Scattering And Absorption of Light in Planetary Regoliths
Published on: July 1, 2019
Los resultados de las imágenes atmosféricas de los rovers de exploración de Marte: Spirit y Opportunity
M T Lemmon1, M J Wolff, M D Smith
1Texas A&M University, College Station, TX 77843, USA. lemmon@tamu.edu
Science (New York, N.Y.)
|December 4, 2004
Resumen
Los rovers marcianos Spirit y Opportunity midieron el polvo atmosférico, encontrando que la profundidad óptica disminuyó con el tiempo. La distribución del polvo fue uniforme, con una altura de escala de aproximadamente 11.6 km.
Área de la Ciencia:
- Ciencias planetarias Ciencias planetarias.
- Ciencias de la atmósfera Ciencias atmosféricas.
- Exploración de Marte La exploración de Marte.
Sus antecedentes:
- La comprensión de las condiciones atmosféricas marcianas es crucial para la planificación de la misión y la interpretación de las observaciones de superficie.
- Estudios anteriores han monitoreado el polvo atmosférico de Marte, pero la distribución vertical detallada y los datos de tamaño de partícula son valiosos.
Objetivo del estudio:
- Para medir y analizar la profundidad óptica atmosférica y las propiedades del polvo en el cráter Gusev y Meridiani Planum utilizando datos del rover.
- Para determinar la distribución vertical y el tamaño de partícula del polvo atmosférico en Marte.
Principales métodos:
- Utilizó datos de los rovers Spirit y Opportunity para medir la profundidad óptica atmosférica visible.
- Analizó las tendencias de profundidad óptica en las misiones primarias de 90 sol.
- Cálculo de la altura de la escala de polvo y el radio medio de las partículas a partir de las mediciones atmosféricas.
Principales resultados:
- Se registró una profundidad óptica atmosférica visible de 0,9 tanto en el cráter Gusev como en Meridiani Planum.
- La profundidad óptica atmosférica disminuyó en 0.60.7% por sol durante las misiones.
- La distribución vertical del polvo en el cráter Gusev indicó una mezcla uniforme con una altura de escala de 11,56 ± 0,62 km.
- Se determinó que el radio medio de las partículas de polvo era de aproximadamente 1,5 micrómetros en ambas ubicaciones.
- Se calculó una relación de profundidad óptica visible-infrarrojo de 2.0 ± 0.2.
Conclusiones:
- La atmósfera marciana exhibió una disminución medible en la profundidad óptica del polvo durante las duraciones de la misión principal.
- La distribución vertical del polvo sugiere una atmósfera bien mezclada en el cráter Gusev.
- Las propiedades del polvo determinadas proporcionan datos valiosos para los modelos climáticos y futuras misiones a Marte.
Videos de Conceptos Relacionados
01:25IR Spectrometers
There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
01:29Assessment of Ventilation II: Respiratory Depth and Rhythm
Respiratory Depth
Respiratory depth measures the volume of air inhaled or exhaled during a breath. It can vary from shallow to deep and typically remains consistent when a person is at rest or asleep. Occasionally, individuals will automatically inhale deeply, known as sighing, which inflates the lungs with more air than normal breathing.
To assess respiratory depth, observe the degree of chest excursion or movement:
Respiratory depth measures the volume of air inhaled or exhaled during a breath. It can vary from shallow to deep and typically remains consistent when a person is at rest or asleep. Occasionally, individuals will automatically inhale deeply, known as sighing, which inflates the lungs with more air than normal breathing.
To assess respiratory depth, observe the degree of chest excursion or movement:
01:18Variation of Atmospheric Pressure
Change in atmospheric pressure with height is particularly interesting. The decrease in atmospheric pressure with increasing altitude is due to the decreasing gravitational force per unit area as we move away from the surface of the earth.
Assuming the air temperature is constant at a given altitude and that the ideal gas law of thermodynamics describes the atmosphere to a good approximation, one can find the variation of atmospheric pressure with height.
Let p(y) be the atmospheric pressure at...
Assuming the air temperature is constant at a given altitude and that the ideal gas law of thermodynamics describes the atmosphere to a good approximation, one can find the variation of atmospheric pressure with height.
Let p(y) be the atmospheric pressure at...
01:13Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview
Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
The ATR process begins by directing a beam...
01:16Flame Photometry: Lab
In a flame photometer, when a solution like potassium chloride is aspirated into the flame, the solvent evaporates, leaving behind dehydrated salt. This salt dissociates into free gaseous atoms in their ground state. Some of these atoms absorb energy from the flame, leading to their excitation. The excited atoms return to the ground state, emitting photons at characteristic wavelengths. Because only electronic transitions are involved, the resulting emission lines are very narrow. The intensity...
01:26Impact: Problem Solving
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...