Video Experimental Relacionado
Updated: Jul 29, 2026

13:29
Production and Measurement of Organic Particulate Matter in a Flow Tube Reactor
Published on: December 15, 2018
Evento de protones solares: influencia en el ozono estratosférico
Resumen
Un importante evento de protones solares en 1972 causó un agotamiento significativo del ozono en la estratosfera polar. Esta pérdida de ozono fue el resultado de la destrucción catalítica por los óxidos de nitrógeno (NOx) generados por el evento solar.
Área de la Ciencia:
- Ciencias de la atmósfera ciencia atmosférica.
- La ingeniería aeroespacial es la ingeniería aeroespacial.
- Física solar Física solar es la física de la energía solar.
Sus antecedentes:
- La capa de ozono de la Tierra protege la vida de las radiaciones ultravioletas dañinas.
- Los niveles de ozono estratosférico están influenciados por varios fenómenos atmosféricos y solares.
Objetivo del estudio:
- Para investigar el impacto del evento de protones solares del 4 de agosto de 1972 en el ozono estratosférico polar.
- Determinar el mecanismo detrás de las reducciones de ozono observadas.
Principales métodos:
- Se utilizaron los datos del experimento de la retrodispersión de rayos ultravioleta (UV).
- Se analizaron las mediciones del satélite Nimbus 4.
Principales resultados:
- Se observaron reducciones a gran escala en el contenido de ozono en la estratosfera media y superior sobre las regiones polares.
- El agotamiento del ozono correlacionado con el mayor evento de protones solares.
Conclusiones:
- La reducción de ozono observada se atribuye a la destrucción catalítica del ozono.
- Los compuestos de nitrógeno impar (NOx) producidos por el evento de protones solares son responsables del agotamiento del ozono.
Videos de Conceptos Relacionados
Global Climate Change
Throughout its ~4.5 billion year history, the Earth has experienced periods of warming and cooling. However, the current drastic increase in global temperatures is well outside of the Earth’s cyclic norms, and evidence for human-caused global climate change is compelling. Paleoclimatology, the study of ancient climate conditions, provides ample evidence for human-caused global climate change by comparing recent conditions with those in the past.
Hess's Law
There are two ways to determine the amount of heat involved in a chemical change: measure it experimentally, or calculate it from other experimentally determined enthalpy changes. Some reactions are difficult, if not impossible, to investigate and make accurate measurements for experimentally. And even when a reaction is not hard to perform or measure, it is convenient to be able to determine the heat involved in a reaction without having to perform an experiment.
SN1 Reaction: Mechanism
Kinetic studies of ionization of a tertiary halide in a protic solvent suggest that only the substrate participates in the rate-determining step (slow step). The nucleophile is involved only after the slowest step. The SN1 reaction takes place in a multiple-step mechanism.
Firstly, the haloalkane ionizes to generate a carbocation intermediate and a halide ion. This heterolytic cleavage is highly endothermic with large activation energy. The ionization of the substrate, facilitated by a polar...
Firstly, the haloalkane ionizes to generate a carbocation intermediate and a halide ion. This heterolytic cleavage is highly endothermic with large activation energy. The ionization of the substrate, facilitated by a polar...
Mutations
Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Radiation Pressure: Problem Solving
The radiation pressure applied by an electromagnetic wave on a perfectly absorbing surface equals the energy density of the wave. The wave's momentum also gets transferred to the surface when an electromagnetic wave is entirely absorbed by it. The rate at which momentum is transmitted to an absorbing surface perpendicular to the propagation direction equals the force on the surface.
The average value of the rate of momentum transfer divided by the absorbing area represents the average force per...
The average value of the rate of momentum transfer divided by the absorbing area represents the average force per...
Origin of Photosynthesis
Photosynthesis represents a fundamental biological process that transformed Earth's atmosphere and paved the way for complex life. Emerging roughly 3.4–3.8 billion years ago, the earliest photosynthetic organisms harnessed light energy to produce organic compounds. These anoxygenic phototrophs used electron donors like hydrogen sulfide (H₂S) or ferrous iron (Fe²⁺), rather than water, and did not release molecular oxygen (O₂) as a byproduct. Various groups, including green sulfur and purple...

