MESSENGER RSS Spherical Harmonics ASCII Data Record (SHADR)

SHADR – Spherical Harmonics ASCII Data Record

Instrument: MESSENGER Radio Science Experiment

PDS Data Set ID: MESS-H-RSS/MLA-5-SDP-V1.0

For more information about RSS SHADR products, see the SHADR Product SIS.

The Radio Science Subsystem (RSS) Spherical Harmonics ASCII Data Record (SHADR) data products are intended to be general and may contain coefficients for spherical harmonic expansions of gravity, topography, magnetic, and other fields.

SHADR files are created from radio tracking, vertical sounding, in situ, and/or other measurements at the institution conducting the scientific data analysis. Each model requires data with complete sampling (in terms of longitude and latitude coverage on the planet), so that SHADR files will be issued infrequently and on schedules which cannot be predicted at this time.

Due to the scope of the product, information specific to each SHADR is found in its respective detached label.

RSS SHADR products have the following file names:

GtMES_nnVxx_SHA.TAB (with detached PDS label)

where:

G = generating institution

J = Jet Propulsion Laboratory

G = Goddard Space Flight Center

C = Centre National d’Etudes Spatiales

M = Massachusetts Institute of Technology

d = type of data represented

G = gravity field

T = topography

M = magnetic field

MES = 3-character spacecraft modifier

nn = 2- or 3-digit maximum degree and order of the solution

Vxx = 2-digit version number

In ODE, SHADR products have the following product IDs:

GDMES_NNVXX_SHA

Two products have product IDs different from their product names:

HGM004B.SHA, for GGMES_50V06_SHA.TAB

HGM007A.SHA, for GGMES_100V07_SHA.TAB