VSO Keyword Lookup : PHYSOBS

Physical Observables

This list provides the detailed description of each of the physical observable keywords used to describe data products served by VSO. Please contact the VSO Project maintainers if you cannot accurately describe your holdings using these terms.

COMPOSITION
a notion of relative abundance, such as relative number densities of solar wind particles as a ratio
EQUIVALENT_WIDTH
differences between intensities measured at nearby wavelengths, typically in line cores, wings, and nearby continuum, whether measured as an intensity difference or an equivalent width
INTENSITY
the direct intensity, either integrated over the spectral observing range or as a function of wavelength (spectral density)
LOS_MAGNETIC_FIELD
Line of sight magnetic field; may be in situ or inferred from the frequency/wavelength Zeeman splitting between opposite circular polarizations of a magnetically-sensitive line
LOS_VELOCITY
the displacement of line center from rest wavelength/frequency in an arbitrary polarization state
NUMBER_DENSITY
the number of particles per unit volume
OSCILLATION_MODE_PARAMETERS
solar internal or atmospheric acoustic-gravity wave measurements. The mode parameters could include frequencies, splittings, amplitudes, widths, etc.
PARTICLE_FLUX
the number of particles passing through a unit area per unit time per unit energy
PARTICLE_VELOCITY
the average velocity or velocity distribution of a group of particles
POLARIZATION_VECTOR
the net linear polarization
STOKES_PARAMATERS
I, Q, U, V - equivalent to observables of net circular, linear and total polarization, and polarization angle
THERMAL_VELOCITY
a characterization of the relationship between the temperature and mass of a distribution of particles
VECTOR_MAGNETIC_FIELD
Vector magnetic field; may be in situ or inferred from Stokes polarimetry
VECTOR_VELOCITY
two- or three-dimensional velocities, typically inferred from helioseismic inversion or from directly measured velocities transverse to the line of sight, possibly combined with Doppler velocities
WAVE_PHASE
solar internal or atmospheric acoustic-gravity wave measurements. The mode parameters could include frequencies, splittings, amplitudes, widths, etc.
WAVE_POWER
solar internal or atmospheric acoustic-gravity wave measurements. The mode parameters could include frequencies, splittings, amplitudes, widths, etc.

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