Ring Diagram Analysis Products
Ring diagrams are obtained from a time series of Dopplergrams of a specific
area of the Sun, generally tracked with the mean rotation velocity. The three
dimensional Fourier transform of this time series gives a power spectrum which
is referred to as a "Ring diagram".
Ring-diagram analysis is used to infer the speed and direction of
horizontal flows below the solar surface by observing the Doppler shifts of
ambient acoustic waves from power spectra of solar oscillations computed over
patches of the solar surface. Data analysis pipelines are used to produce
spatially-resolved data describing the fluid motions and thermal structure in
the sub-surface regions of the solar convection zone. Two pipelines are
operational, one producing synoptic views of the flows and structure on regular
spatial grids, and the other producing detailed flow and structure anomalies
associated with specific target regions.
Available products:
- Ring Fits c: Fit parameters for a multi-parameter model for line
and background characteristics of a 3-d solar acoustic power spectra of
(tracked) (mapped) data cubes using the procedure of Basu and Antia
(ApJ 512, 458; Solar Phys 192, 469).
- Ring Fits f: Fit parameters for transverse advective terms and
other line background characteristics to a 3-d solar acoustic power spectra
of (tracked) (mapped) data cubes using the procedure of Haber et al.
(ApJ 570, 855; Solar Phys 192, 335).
- Full 3-dimensional power spectra
- Tracked Cubes:
- Sub Surface Flow Maps:
Modules
- rdcover
rdcover generates estimates of the effective duty cycle (coverage)
in its input data source for a time range, cadence, and selection
criteria identical to those that would be supplied to mtrack.
It is intended for use in filtering front ends for pipeline scripts
that automatically process data over extended time ranges.
- datavg
datavg averages the data from a selected segment in a set of DRMS records,
constructing "images" (hypercubes of the same dimensionality as the input
segment) of the mean value, the standard deviation, and the number of valid
values for each pixel over the set.
- mtrack:
mtrack takes as its input a dataset of records representing solar
image data observed at a uniform temporal cadence, and produces as
its output a set of records representing mapped cubes at selected
heliographic coordinates, tracked at selected rates for the duration
of the input data interval. The tracked data cubes provide the input
to pspec3 and all subsequent ring-diagram analysis procedures; they
also provide input to the time-distance analysis pipeline and possibly
other local analysis procedures. They may also be used for animations.
- pspec3:
pspec3 is designed to calculate the full 3-dimensional power spectra of
a set of time series of 2-dimensional images. The input data are optionally
apodized by a (1-x^2)^2 taper operating between specified inner and
outer radii of the images and a similar taper operating on the time axis
(image number).
- rdfitf:
rdfitf implements the procedure of Haber et al. (ApJ 570, 855;
Solar Phys 192, 335) for fitting 3-d solar acoustic power spectra
to a model for transverse advective terms and other line background
characteristics.
- rdfitc:
rdfitc implements the procedure of Basu and Antia (ApJ 512, 458;
Solar Phys 192, 469) for fitting 3-d solar acoustic power spectra to
a multi-parameter model for line and background characteristics.
- rdvinv:
rdvinv performs an OLA inversion on a set of ring-fit parameters Ux and Uy
for transverse velocity functions of depth.
For more information regarding HMI Ring Diagram pipeline modules,
see Pipeline Modules and
Pipeline Descriptions.
Joint Science Operations Center (JSOC)
JSOC Processing Status
