| Abnormal Operation |
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Encompasses unforeseen circumstances that are not handled via established contingency plans and operational states such as anomalous conditions or failures. |
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| Absolute Time Commands |
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Stored Commands that have a time tag containing an absolute spacecraft time. |
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| Absolute Time Command Buffer |
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An allocated memory area used to store the absolute time commands. |
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| Absolute Time Sequence |
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Sequence of commands executed at the absolute time tag associated with each command in the sequence. |
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| Accepted Risk |
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A risk (an unplanned event) that is understood and agreed to by the program, organization partners, sponsors, stakeholders, and customer(s) sufficient to achieve the defined success criteria within the approved level of resources. A risk is accepted when its impact is deemed “acceptable” (does not drive a change to the baseline), and/or no additional resources are expended to mitigate the risk. In other words, it is decided that no further action will be taken to reduce the risk. |
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| Acceptance Tests |
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Tests that establish the basis for delivery of an item under terms of a contract. |
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| Access Point |
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The Ground Segment interface from which authorized users can request and access GOES-R products, data, and information. |
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| Accuracy |
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Refers to the error in a measurement that is the difference between the measured and true value. It includes both systematic and random errors. Systematic errors must be estimated from an analysis of the experimental conditions and techniques. Random errors can be determined, and reduced, through repeated measurements under identical conditions and a Standard Deviation calculated. The magnitude of a random error is taken as three standard deviations (3σ). |
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| Activation and Characterization Test (ACT) |
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The Activation and Characterization Test period is the phase of post-launch test consisting of functional verification of spacecraft and instrument operation. |
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| Ad hoc request |
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In the context of a GOES product request, indicates a one-time request for a specific product(s). Not a product subscription. |
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| Advanced Baseline Imager (ABI) |
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A multi-spectral channel, two-axis scanning radiometer designed to provide variable area imagery and radiometric information of the Earth’s surface as well as the capability for star sensing. The ABI measures emitted and solar reflected radiance simultaneously in all spectral channels. Data availability, radiometric quality, simultaneous data collection, coverage rates, scan flexibility, and minimizing data loss due to the sun, are prime capability requirements of the ABI system. |
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| Affiliated Organization |
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Other Government agencies, other NOAA facilities, or research institutions that provide support (acquisition, design, development, financial resources, facilities, materials, procedures, equipment and personnel) to or are otherwise associated with the GOES-R Series Program, Flight or Ground Segment Projects, or contractors. |
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| Algorithm Maturity |
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When expressed as a percentage (e.g., 80%, 100%), represents a metric of both the completeness of a data processing algorithm and the creator’s confidence in the algorithm’s ability to meet quality requirements for all expected input data. |
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| Algorithm Theoretical Basis Document (ATBD) |
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A document delivered for each product generation algorithm that describes the algorithm such that it can be implemented and tested in the Ground System. |
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| Ancillary data |
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Data from a source other than a GOES-R satellite required to perform an instrument's data processing |
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| Anomaly |
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A discrepancy or deviation from the expected behavior. Anomalies can result from a variety of sources such as system faults, failures, incorrect configurations, unexpected events, and operator errors. |
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| Applicable documents |
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Documents to be used as though they were included within the citing document. |
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| Archive (Ground Segment) |
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Capability at a Data Center for maintaining a permanent electronic record of designated files, data, and documentation. |
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| Assembly |
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An integrated set of components and/or subassemblies that comprise a defined part of a subsystem. |
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| Attitude Knowledge |
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Attitude knowledge is the difference between the true attitude and estimated attitude. |
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| Audit |
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A review of the Prime Contractor’s, or subcontractor's documentation, software or hardware to verify that it complies with project requirements. |
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| Authorized user |
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Users authorized to have access to GOES-R ground segment distribution function and associated products, data, and information. |
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| Autonomy |
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The ability to implement an automatic pre-defined response to a stimulus and / or condition that results in a change of the operational mode and / or status of a piece of hardware and /or software independent of external intervention. |
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| Availability |
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The probability that a system can provide functionality meeting requirements. |
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| Availability, operational |
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See Operational Availability |
