wannalancit stairs, lowell (1830) ivan galkin university of massachusetts lowell department of...
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Wannalancit Stairs, Lowell (1830)
Ivan GalkinUniversity of Massachusetts Lowell • Department of PhysicsCenter for Atmospheric Research
Domain Ontology for ESPAS
Acknowledge: GIRO data repositories, RPI BinBrowser, DIDBase SAO Explorer
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Terminology
ONTOLOGY(computer science): a list of domain concepts and their relationships• Domain = Space Physics
Fields, Particles, Waves• Concepts = Space Physics phenomena
Events and data features (characteristics)• Relationships = Generic vs Specific
Waves – Waves.Radio – Waves.Radio.VLF Dictionary-controlled versus free-text
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Definition
ESPAS Ontology is a comprehensive, dictionary-controlled description of all physical observations and … (characteristics and events) that can be retrieved from the ESPAS data resources.
ESPAS Ontology should not contain aspects related to the measurement specifics (e.g., type of instrumentation or measured quantity).
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Acknowlegements
SPASE data model• Ontology of space physics
Shing Fung and Bob Benson (NASA Virtual Wave Observatory)• Ontology of wave domain
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Introduction: Data Analysis Challenges
Executive summary: DATA AVALANCHE• Multi-petabyte raw data capability is NOW• Impossible to download• Even downloaded, no standard tools to
explore data• Even with tools, no time to explore massive
data volumes• Steep learning curves at each step of the
process ANSWER – infrastructure for
dissemination of the expert knowledge derived from raw data
Targeted search by content (phenomena)
1.2 M images at 5 s/image for 20 hr/week = 2 years of life More realistically, 10K images per summer student = 30 student-years
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Introduction: Challenges of Wave Data
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FUV on IMAGE showing brightening of aurora emissions
Hinode telescope showing multiple solar flares
RPI dynamic spectrogram in 3-1000 kHz showing… err… hmm… what the heck is this
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Solar Type IIIRadio BurstSolar Type IIIRadio Burst
KCKC
AKRAKR
MagnetosheathNoiseMagnetosheathNoise
Upper HybridResonance
Upper HybridResonance
Continuum
Radiation
Continuum
Radiation(n+½)
Gyroharmonics(n+½)Gyroharmonics
PHPH PHPH
AKRAKR
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Fundamental gyrofrequencyFundamental gyrofrequency
Upper Hybrid frequencyUpper Hybrid frequency
Plasma frequencyPlasma frequency
AKRAKRW
his
tler
mode e
mis
sions
Whis
tler
mode e
mis
sions
FAP trace X modeFAP trace X modeFAP trace O modeFAP trace O mode
Direct echoesDirect echoesZ mode cutoffZ mode cutoff
X mode cutoffX mode cutoff
FAP traceZ-mode
FAP traceZ-mode
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BinBrowserOntology ofPhenomena inRPI plasmagrams
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This ontology is a list
Epsilon and Ducted may apply simultaneously
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Adding Relationships to Ontology
Resonance• Resonance.Plasma• Resonance.Unmatch
ed Ducted
• Ducted.Epsilon• Ducted.PolarCap
SolarRadioBurst.TypeIII RadioBurst
• RadioBurst.Solar RadioBurst..Solar.TypeIII
Earth.Plasmashere.Hiss
Radiation.Auroral.Kilometric
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RPI Plasmagrams: RPI Spectrograms:
Parent-child relationship does not work!
Attributes of phenomena are grouped in independent categories
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Early work to introduce relationships
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WRONG APPROACH
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Defining Attributes of Wave Phenomena
AKR• Radio Emission (class)• Auroral (origin)• Kilometric (spectral range)
Plasmaspheric Hiss• Radio Emission (class)• Plasmasphere (observed
region)• Hiss (frequency character)
Solar Radio Burst Type III• Solar (origin)• Radio Emission (class)• Burst (temporal character)• Type III (subclass of bursts)
Plasmagram Epsilon• Traces (class)• Ducted (propagation)• Multi-Hop (qualifier)
Electron Cyclotron Resonance• Resonance (class)• Electron Cyclotron
(propagation mode) Atmospheric
Gravity Wave 13
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Ontology components for ESPAS
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Phenomenon
Name
Description Class
Subclass
QualifierQuantity
Observed Region
Origin
Propagation
Spectral Range
Frequency Character
Temporal-Spatial
Character
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Ontology document is open for editing
15https://docs.google.com/spreadsheet/ccc?key=0AgtjeBUrLLGLdHJ4ckRxZjFsX19raTlfRWxGenRLQnc#gid=0
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Examples: NmF2 Name = NmF2 Description = Peak plasma density of
F2 layer Class = Particle.Charged Subclass = Electron Qualifier = Profile.Altitude, Maximum Quantity = NumberDensity ObservedRegion =
Earth.NearSurface.Ionosphere.F-region.2
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Examples: foF2 Name = foF2 Description = Critical frequency of F2 layer Class = Wave.Plasma Subclass = Electromagnetic Qualifier = Stimulated, Derived Quantity = Frequency.Cutoff ObservedRegion =
Earth.NearSurface.Ionosphere.F-region.2 SpectralRange = HF Origin = ActiveInstrument Propagation = Trapped PropagationMode = 0 FrequencyCharacter = Line
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Use of common names
Expert adding the annotation• Looks up common name in the master list• If the name found
Translator uses given common name to retrieve full ontology specification
• If the name is not found Expert specifies all components of ontology and
adds new row to the master list
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Use of common names
User looking for annotations. Two possibilities:• Looks up common name in the master list• Specifies come or all components of the
phenomenon description
Example: look for wideband emissions in magnetosphere• Class = Radio Emission• Frequency Character = Wideband• Observed Region = Earth.Magnetosphere 19