Glossary A

The term Above ground level is used in aviation, atmospheric sciences and broadcasting, and is the height above ground level (AGL) measured with respect to the underlying ground surface.

The term Absolute humidity describes the water content of air and is expressed in either grams per cubic meter (m³) or grams per kilogram.

English: Absorber / Deutsch: Absorber / Español: Absorbente / Português: Absorvedor / Français: Absorbeur / Italiano: Assorbitore /

An absorber is a device or material that absorbs a particular type of energy, such as sound waves, electromagnetic radiation, or heat.

In the aerospace context, absorption refers to the process by which a substance absorbs or takes in another substance. This can occur through chemical reactions, physical processes, or a combination of both.

In the dynamic and demanding field of aerospace, precise measurement of motion is essential for various applications, ranging from aircraft stability control to spacecraft navigation. One of the key tools used for this purpose is the accelerometer.

In the aerospace industry, "access" can refer to the ability to enter, approach, or use something, such as an aircraft, spacecraft, or facility. Access can be restricted or limited for various reasons, such as safety, security, or maintenance.

Deutsch: Zugang zum Luftraum im Kontext der Raumfahrtindustrie / Español: Acceso al espacio aéreo en el contexto de la industria espacial / Português: Acesso ao espaço aéreo no contexto da indústria espacial / Français: Accès à l'espace aérien dans le contexte de l'industrie spatiale / Italiano: Accesso allo spazio aereo nel contesto dell'industria spaziale

Access to airspace in the space industry context refers to the ability to utilize and traverse the Earth's atmosphere and outer space for purposes of launching and operating spacecraft, satellites, and other space-related technologies. This encompasses regulatory, legal, and logistical considerations that ensure safe and coordinated use of airspace by different entities, including governmental space agencies, private space companies, and international collaborators.

An accident is an unintended, normally unwanted event that was not directly caused by humans.

Deutsch: Genauigkeit / Español: Precisión / Português: Precisão / Français: Précision / Italiano: Precisione /

Accuracy and precision are two measures of observational error. Accuracy is how close a given set of measurements (observations or readings) are to their true value, while precision is how close the measurements are to each other.

In the aerospace context, achievement refers to a significant accomplishment or progress in the field of aerospace technology and exploration.

In the aerospace context, acquisition refers to the process of acquiring or obtaining something, such as a product, service, or technology. This process can involve a variety of activities, such as identifying a need, researching potential solutions, negotiating a price or terms, and finalizing the purchase or acquisition.

In the aerospace context, ACS stands for "Attitude Control System." This system is responsible for controlling the orientation or attitude of a spacecraft or aircraft.

The term "active" can have various meanings depending on the specific application. Generally, it refers to a system or component that is actively controlled or adjusted in real-time to achieve a desired outcome.

Deutsch: Aktive Geräuschkontrolle / Español: Control activo de ruido / Português: Controle ativo de ruído / Français: Contrôle actif du bruit / Italiano: Controllo attivo del rumore

Active Noise Control (ANC) in the space industry context refers to the technology used to reduce unwanted sound through the addition of a second sound specifically designed to cancel the first. This technique is especially relevant in spacecraft and space station modules, where the control of noise levels is critical for the comfort and health of astronauts. ANC systems work by detecting the ambient noise with microphones, processing the sound to determine the appropriate cancellation signal, and then emitting this counter-sound through speakers, effectively neutralizing the unwanted noise.

Active space refers to the region of space where a spacecraft or satellite can maneuver and maintain its position or orbit. It is an important concept in aerospace engineering because it defines the operational limits of a spacecraft and influences mission planning and spacecraft design. In this article, we will explore what active space is and provide examples of its application in different aerospace scenarios.

Deutsch: Aktive Temperaturkontrolle / Español: Control térmico activo / Português: Controle térmico ativo / Français: Contrôle thermique actif / Italiano: Controllo termico attivo

Active Thermal Control in the space industry context refers to systems designed to maintain the temperature of spacecraft, satellites, and space stations within safe operational limits through active management. These systems dynamically regulate the internal and external temperature of space vehicles to protect sensitive equipment and ensure the comfort and safety of astronauts. Active thermal control involves the use of mechanical, electrical, and fluid-based technologies to transfer heat from warmer to cooler areas or vice versa, depending on the thermal requirements of the mission.

In the aerospace industry, "activity" can refer to a wide range of tasks, processes, and operations that are related to the design, development, manufacturing, testing, and maintenance of aircraft and spacecraft, as well as the operation and support of these systems.

Actuation refers to the process of activating or controlling a device or system by means of an external force or signal. Actuation systems are used in a variety of aerospace applications to control the movement or position of mechanical components, such as flaps slats, and other control surfaces.

In the aerospace context, an actuator is a device that converts energy into motion in order to perform a specific task. Actuators are used to control and move various parts of aircraft and spacecraft, such as flaps, rudders, and landing gear. They are typically powered by hydraulic, pneumatic, or electrical systems, and may be controlled by electronic or mechanical means.