enumeration 
Anisotropy 
Directiondependent property. 

enumeration 
Array 
A sequence of values corresponding to the
elements in a rectilinear, ndimension matrix.
Each value can be referenced by a unique index. 

enumeration 
Average 
The statistical mean; the sum of a set of
values divided by the number of values in
the set. 

enumeration 
Characteristic 
A quantity which can be easily identified
and measured in a given environment. 

enumeration 
Circular 
Relative to polarization, righthand circularly
polarized light is defined such that the electric
field is rotating clockwise as seen by an
observer towards whom the wave is moving.
Lefthand circularly polarized light is defined
such that the electric field is rotating counterclockwise
as seen by an observer towards whom the wave
is moving. The polarization of magnetohydrodynamic
waves is specified with respect to the ambient
mean magnetic field : righthand polarized
waves have a transverse electric field component
which turns in a righthanded sense (that
of the gyrating electrons) around the magnetic
field. 

enumeration 
Column 
A twodimensional measure of a quantity. The
column is the area over which the quantity
is measured. 

enumeration 
Component 
Projection of a vector along one of the base
axes of a coordinate system. 

enumeration 
Component.I 
Projection of a vector along the first named
axis of a coordinate system. Typically the
X axis, but could be the R axis for an RTN
coordinate system. 

enumeration 
Component.J 
Projection of a vector along the second named
axis of a coordinate system. Typically the
Y axis, but could be the T axis for an RTN
coordinate system. 

enumeration 
Component.K 
Projection of a vector along the third named
axis of a coordinate system. Typically the
Z axis, but could be the N axis for an RTN
coordinate system. 

enumeration 
CrossSpectrum 
The Fourier transform of the cross correlation
of two physical or empirical observations. 

enumeration 
Deviation 
The difference between an observed value and
the expected value of a quantity. 

enumeration 
Differential 
A flux measurement within a given energy and
solidangle range. 

enumeration 
Direction 
The spatial relation between an object and
another object, the orientation of the object
or the course along which the object points
or moves. 

enumeration 
DirectionAngle 
The angle between a position vector or measured
vector (or one of its projections onto a plane)
and one of the base axes of the coordinate
system. 

enumeration 
DirectionAngle.AzimuthAngle 
The angle between the projection into the
ij plane of a position or measured vector
and the iaxis of the coordinate system. Mathematically
defined as arctan(j/i). 

enumeration 
DirectionAngle.ElevationAngle 
The angle between the position or measured
vector and the ij plane of the coordinate
system. Mathematically defined as arctan(k/SQRT(i^2+j^2)). 

enumeration 
DirectionAngle.PolarAngle 
The angle between the position or measured
vector and the kaxis of the coordinate system.
Mathematically defined as arctan([SQRT(i^2+j^2)]/k). 

enumeration 
FieldAligned 
The component of a quantity which is oriented
in the same direction of a field. 

enumeration 
Fit 
Values that make an model agree with the data. 

enumeration 
Group 
An assemblage of values that a certain relation
or common characteristic. 

enumeration 
Integral 
The summation of values above a given threshold
and over area or solidangle range. 

enumeration 
Integral.Area 
Integration over the extent of a planar region,
or of the surface of a solid. 

enumeration 
Integral.Bandwidth 
Integration over the width a frequency band. 

enumeration 
Integral.SolidAngle 
Integration over the angle in threedimensional
space that an object subtends at a point. 

enumeration 
LineOfSight 
The line of sight is the line that connects
the observer with the observed object. This
expression is often used with measurements
of Doppler velocity and magnetic field in
magnetograms, where only the component of
the vector field directed along the line of
sight is measured. 

enumeration 
Linear 
Polarization where the Efield vector is confined
to a given plane 

enumeration 
Magnitude 
A measure of the strength of a vector quantity
or length of its representational vector. 

enumeration 
Moment 
Parameters determined by integration over
a distribution function convolved with a power
of velocity. 

enumeration 
Parallel 
Having the same direction as a given direction 

enumeration 
Peak 
The maximum value for the quantity in question,
over a period of time which is usually equal
to the cadence. 

enumeration 
Perpendicular 
At right angles to a given direction. 

enumeration 
Perturbation 
Variations in the state of a system. 

enumeration 
Phase 
A point or portion in a recurring series of
changes. 

enumeration 
PhaseAngle 
Phase difference between two or more waves,
normally expressed in degrees. 

enumeration 
Projection 
A measure of the length of a position or measured
vector as projected into a plane of the coordinate
system. 

enumeration 
Projection.IJ 
A measure of the length of a position or measured
vector projected into the ij (typically XY)
plane of the coordinate system. 

enumeration 
Projection.IK 
A measure of the length of a position or measured
vector projected into the ik (typically XZ)
plane of the coordinate system. 

enumeration 
Projection.JK 
A measure of the length of a position or measured
vector projected into the jk (typically YZ)
plane of the coordinate system. 

enumeration 
Pseudo 
Similar to or having the appearance of something
else. Can be used to indicate an estimation
or approximation of a particular quantity. 

enumeration 
Ratio 
The relative magnitudes of two quantities. 

enumeration 
Scalar 
A quantity that is completely specified by
its magnitude and has no direction. 

enumeration 
Spectral 
Characterized as a range or continuum of frequencies 

enumeration 
StandardDeviation 
The square root of the average of the squares
of deviations about the mean of a set of data.
Standard deviation is a statistical measure
of spread or variability. 

enumeration 
StokesParameters 
A set of four parameters (usually called I,Q,
U and V) which describe the polarization state
of an electromagnetic wave propagating through
space. 

enumeration 
Symmetric 
Equal distribution about one or more axes. 

enumeration 
Tensor 
A generalized linear "quantity" or "geometrical
entity" that can be expressed as a multidimensional
array relative to a choice of basis of the
particular space on which it is defined. 

enumeration 
Total 
The summation of quantities over all possible
species. 

enumeration 
Trace 
The sum of the elements on the main diagonal
(the diagonal from the upper left to the lower
right) of a square matrix. 

enumeration 
Uncertainty 
A statistically defined discrepancy between
a measured quantity and the true value of
that quantity that cannot be corrected by
calculation or calibration. 

enumeration 
Variance 
A measure of dispersion of a set of data points
around their mean value. The expectation value
of the squared deviations from the mean. 

enumeration 
Vector 
A set of parameter values each along some
independent variable (e.g., components of
a field in three orthogonal spatial directions;
atmospheric temperature values at several
altitudes, or at a given latitude and longitude;). 
