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).
- hmi.rdVfitsc_fd05: Ring fits to power spectra of 5-deg HMI Doppler cubes on ring-diagram synoptic grid tracked 1/72 CR.
- hmi.rdVfitsc_fd15: Ring fits to power spectra of 15-deg HMI Doppler cubes on ring-diagram synoptic grid tracked 1/24 CR.
- hmi.rdVfitsc_fd30: Ring fits to power spectra of 30-deg HMI Doppler cubes on ring-diagram synoptic grid tracked 1/12 CR.
- 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).
- hmi.rdVfitsf_fd05: Ring fits to power spectra of 5-deg HMI Doppler cubes on ring-diagram synoptic grid tracked 1/72 CR.
- hmi.rdVfitsf_fd15: Ring fits to power spectra of 15-deg HMI Doppler cubes on ring-diagram synoptic grid tracked 1/24 CR.
- hmi.rdVfitsf_fd30: Ring fits to power spectra of 30-deg HMI Doppler cubes on ring-diagram synoptic grid tracked 1/12 CR.
- Full 3-dimensional power spectra
- hmi.rdVpspec_fd05: Power spectra of 15-deg HMI Doppler cubes on ring-diagram synoptic grid tracked 1/24 CR.
- hmi.rdVpspec_fd15: Power spectra of 15-deg HMI Doppler cubes on ring-diagram synoptic grid tracked 1/24 CR.
- hmi.rdVpspec_fd30: Power spectra of 30-deg HMI Doppler cubes on ring-diagram synoptic grid tracked 1/12 CR.
- Tracked Cubes:
- hmi.rdVtrack_fd05: 5-deg Doppler cubes on ring-diagram synoptic grid tracked 1/72 CR.
- hmi.rdVtrack_fd15: 15-deg Doppler cubes on ring-diagram synoptic grid tracked 1/24 CR.
- hmi.rdVtrack_fd30: 30-deg Doppler cubes on ring-diagram synoptic grid tracked for 1/12 CR .
- Sub Surface Flow Maps:
- hmi.rdVflows_fd15_frame: Flow inversions of fits to ring-diagram power spectra of 15-deg HMI Doppler cubes on ring-diagram synoptic grid tracked 1/24 CR .
- hmi.rdVflows_fd30_frame: Flow inversions of fits to ring-diagram power spectra of 30-deg HMI Doppler cubes on ring-diagram synoptic grid tracked 1/12 CR5-deg Doppler cubes on ring-diagram synoptic grid tracked 1/72 CR.
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 rdcover.
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. .
<
li> pspec3: .
- 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.
.
- rdsinv:rdsinv performs an asymptotic sound-speed inversion of the differences between
a set of target and comnparison ring-fit frequencies for the profile of sound-
speed differences as a function of depth. .
For more information regarding HMI Ring Diagram pipeline modules, see Pipeline Modules and Pipeline Descriptions.
Joint Science Operations Center (JSOC)
