THEMIS Particle Moments (Ground)

Density, velocity, and temperature for ESA electrons.

A variety of data products can be derived by computing the moments of measured THEMIS particle data. Moments are produced after selecting a spacecraft, particle data type, and time range. Some products also require a magnetic field variable.

For command line usage see:

/projects/THEMIS/examples/basic/thm_crib_part_products.pro

Products

Products marked with a * require magnetic field data to be loaded. All "vector" data types are 3-vectors. Symmetric tensors are stored in six dimensions: xx, yy, zz, xy, xz, yz.

Variable Name	Description	Units	Data type
density	Density	1/cm3	scalar
current	Current		scalar
flux	Number flux	1/(s·cm2)	vector
eflux	Energy flux	eV/(s·cm2)	vector
velocity	Velocity	km/s	vector
t3	Diagonalized temperature	eV	vector
magt3	Magnetic field aligned temperature*	eV	vector
avgtemp	Average temperature	eV	scalar
vthermal	Thermal velocity	km/s	vector
mftens	Momentum flux tensor	eV/cm3	symmetric tensor
ptens	Pressure tensor	eV/cm3	symmetric tensor
symm	Direction of pressure tensor symmetry	n/a	vector
symm_phi	Phi (longitude) direction of symmetry vector	°	scalar
symm_theta	Theta (latitude) direction of symmetry vector	°	scalar
symm_ang	Angle between symmetry vector and magnetic field*	°	scalar

Resources

ESA instrument page

SST instrument page