##
vdt: Site Dependent Day Complex SHT Time Series

vdp: Site Dependent Day m-nu Power Spectrum

vdl: Site Dependent Day l-nu Diagram Image (Power Spectrum)

**DNSPIPE**
creates the site day mode coefficient time series, power spectra and l-nu diagrams
from calibrated velocity images (the *vzi* files output from **VMBICAL**.)
The images are registered in heliographic coordinates, temporally detrended using
a 2-point backward difference filter, then run through a spherical harmonic transform
to generate the time series images from L=0 to L=200. The y axis of the time series
images represents the m value (M=0 to M=L) with the imaginary part of the SHT (M=L
to M=-L) in the third pixel dimension (*vdt*[*,*,2].) There are two window functions,
each in the L+2 row of both the real and imaginary parts of the time series. The
[*,L+2,1] is the observed window function, and the [*,L+2,2] represents the window
after gapfilling. The x axis represents time in minutes.
TS_START
and TS_END
correspond to the date/time of the first and last pixel column in the time series.

Before the time series is gapfilled, **TSCLEAN**
is called to remove anomalous time samples in the L=0 to L=19 images. This will alter
the observed window when abnormally high data points are found. **PSERIES**
is called to generate the power spectra from the gapfilled time series (no longer
archived.) The site day l-nu diagrams are produced from the power spectra and are
available online.

- Sample Time Series
- Sample M-Averaged vdl Image
- Sample Rotation Corrected vdl Image
- Sample Prograde vdl Image
- Sample Retrograde vdl Image
- Sample Zonal vdl Image
- Sample FITS header

Revision: $Id: vdt.html,v 1.3 2004/10/08 22:27:44 khanna Exp $