Data Used in Plot
8358d4a.lbl and 8358d47a.eds
MGS Radio Science Data
The reduced Electron Density dataset contains the entire collection of radio occultation ionospheric electron density (EDS) profiles derived from Mars Global Surveyor (MGS) data during the MGS mission. The aareadme.txt file provides an introduction to the reduced data set while raw data are available online or by request.
Derived Data - Occultation Electron Density
The data are located at mors_1102. This data set is comprised of data products, each derived from an individual ingress or egress occultation. Each product lists observing parameters and a table including latitude, longitude, electron density and standard deviation as a function of radius (distance from the center of mass of the planet) or altitude.
The EDS directory contains 12 subdirectories with names of the form yyyy_ddd giving the year (yyyy) and day-of-year (ddd) of the first electron density file within it. The subdirectory coverage does not overlap and there are often days or weeks between the last file in one directory and the first file in the next.
Raw Data (EDR)Volumes mors_0101 - mors_0156 contain Mars Global Surveyor Radio Science Cruise Data. Volume mors_0156 is available on-line. Request other volumes if required.
Volumes mors_0210 - mors_0359 contain Mars Global Surveyor Radio Science Mars Orbit Insertion (MOI) Data. Volume mors_0210 is available on-line. Request other volumes if required.
Volumes mors_0401 - mors_0584 contain Mars Global Surveyor Radio Science Mapping Data. Volume mors_0410 is available on-line. Request other volumes if required.
Volumes mors_0601 - mors_08xx contain Mars Global Surveyor Radio Science Mapping Data. Volume mors_0610 is available on-line. Request other volumes if required.
Assessing the data
The following index (xlsx, txt) can be used to select desired files. A more complete index is available.
The Software Interface Specification (SIS) document provides a more detailed description of the data set while catalogue files in mors_1102 define the mission, spacecraft and instrument.