urn:nasa:pds:mgs-rss:data-sri:9153x24a 1.0 1.22.0.0 Product_Observational 2025 MGS RSS This file contains a 2-D array in image format showing power vs frequency and time near a Mars Global Surveyor radio occultation. A nominal image is made from 300 512-point power spectra where the spacing between spectra is 0.2048 s and the frequency spanned is 2500 Hz (4.88 Hz resolution). Images show the spacecraft carrier emerging from occultation (egress) or disappearing as the spacecraft goes behind the limb (ingress). Near the occultation time there may be a weak surface echo racing away from the carrier to lower frequencies (egress) or coming in from higher frequencies to merge with the carrier at occultation (ingress). Richard Simpson 1 Stanford University https://ror.org/00f54p054 2025-02-18 1.0 This product, 9153X24A.SRI, was originally released as part of the PDS3 MGS-M-RSS-5-SDP-V1.0 data set. The metadata have been migrated to PDS4. The data themselves are unchanged. 1999-06-02T23:24:00Z 1999-06-02T23:36:00Z Science Derived Mars Global Surveyor Surface Reflection Geometry Mars Global Surveyor Mission urn:nasa:pds:context:investigation:mission.mars_global_surveyor data_to_investigation Mars Global Surveyor Host urn:nasa:pds:context:instrument_host:spacecraft.mgs is_instrument_host Radio Science Subsystem (RSS) Instrument urn:nasa:pds:context:instrument:mgs.rss is_instrument Mars Planet urn:nasa:pds:context:target:planet.mars data_to_target Array_2D_Image display_settings_to_array Sample Left to Right Line Top to Bottom MGS-M-RSS-5-SDP-V1.0:9153X24A.SRI:9153X24A.SRI data_to_derived_source_product 10.17189/1519757 PDS Planetary Plasma Interactions Node This is the first version converted to PDS4. The DOI references the source PDS3 data set. 9153X24A.SRI 2001-03-21T09:50:08 307200 0415e671d0f8b9a85926e90f8a43f578 File names are of the form ydddHmmC.SRI where y is the one-digit year, ddd is the 3-digit day-of-year, H is a letter denoting the hour (A=00, B=01, ..., X=23), and mm is the 2-digit minute of the first data in the file. C indicates version of the file; C='A' is the first version, 'B' is the second version, etc. ydddHmm in these files is intended to be similar to ydddHmm in TPS and TPH occultation file names and in SRT and SRI surface scattering file names. However, because SRI files are produced independently, this correspondence cannot be guaranteed. Further, mm in the other files can sometimes include a letter -- if data were collected simultaneously at two antennas; and the version indicators (C) may be entirely different. Array_2D_Image 0 2 Last Index Fastest This image contains values of received signal power versus frequency and time in units of decibels relative to one watt. Values can be obtained by multiplying the sample in the image by the scaling factor and then adding the offset. Each line in the image corresponds to one power spectrum. The first line in the file is the LAST spectrum. The first point in a line corresponds to the lowest frequency (0 Hz). SignedMSB2 dB 0.01 Line 300 1 Sample 512 2