*** MOM DATA IS AVAILABLE FROM PERIOD 24 SEP 2014 TO 23 SEP 2016 ONLY FOR REGISTERED USERS. ***

Welcome to Mars Orbiter Mission Data Archive

MARS orbiter mission is carrying instruments with well-defined scientific objectives. The orbit considered for the Mars mission is 500km x 80,000km around Mars. Choice of such a highly elliptical orbit is facilitating both localized observations with higher spatial resolution as well as observations with large coverage and high radiometric and temporal resolutions. From the apogee the full Martian disc can be imaged even with a sensor having moderate field of view (FOV) and any target on mars can be continuously observed for more than ten hours providing large integration times that allow detection of very faint signals.

Mars Orbiter Mission science data processing activities include, transforming telemetry data comprising both primary and ancillary into different levels of science data products processed for radiometry and geometry aspects following established universal standards to incorporate all acquisition, calibration information, processing context details to be archived for long term use.

PDS DATA OBJECTS

Instrument Description PDS Data Object DATA TYPE
MCC Mars color camera (MCC) is a CMOS image sensor of 2K×2K area array providing color images of Mars. BINARY IMAGE RAW RAD
TIS A Thermal Infrared grating spectrometer (TIS) Makes use of an un-cooled micro-bolometer array as the detector. Suitable for moderate to coarse spatial and spectral resolutions. BINARY QUBE RAW RAD
MSM Methane Sensor for Mars (MSM) is a differential radiometer based on Fabry‐Perot Etalon filters which measures reflected solar radiance in two channels in the SWIR spectral region. ASCII TABLE RAW RAD
MENCA Mars Exospheric Neutral Composition Analyzer (MENCA) for in-situ measurement of neutral composition and distribution of the Martian exosphere. ASCII ARRAY RAW
LAP Measurement of “Deuterium/Hydrogen Ratio” in the Martian upper atmosphere. Works on the principle of “Resonant Scattering and at Lyman-a wavelengths corresponding to H and D. Resonant Absorption” at Martian upper atmosphere. ASCII SPREADSHEET RAW RAD

For MCC, MSM, LAP and TIS both RAW data and RAD data available.
For MENCA only RAW data available.

The ground segment for planetary missions comprises four major elements, namely Deep Space Network (DSN), Spacecraft Control Center (SCC), Indian Space Science Data Center (ISSDC) and Payload Operations Centre (POC). The ground segment is responsible for making the data available for the scientists along with auxiliary information, in addition to storage of payload, spacecraft data and product to identified users.

Science and housekeeping telemetry arrives at the ISSDC in form of telemetry packets. Within the ISSDC the raw science data is transformed into Level-0 data product that is uncalibrated in PDS compatible files. Spacecraft transmits data both primary (instrument data) and auxiliary (house keeping data) in a manner through onboard hardware and received using identified specialized ground systems known as Payload Data Acquisition System (PACQ) . If the primary data or science data is compressed onboard for reducing data rates,then it is decompressed in ground processing. Both primary and ancillary data is placed to the storage identified at data archive centre ISSDC.

LEVELS OF DATA SETS

Type Description CODMAC Level
Raw Data Telemetry data with instrument data embedded. Edited Data Split or decommutated into a data set for a given instrument. Sometimes called Experimental Data Record. Data are also tagged with time and location of acquisition. 2
Calibrated Data Edited data that are still in units produced by instrument, but that have been corrected so that values are expressed in or are proportional to some physical unit such as radiance. No resampling, so edited data can be reconstructed. 3

MARS ORBITER MISSION SCIENCE DATA

LONG TERM ARCHIVE

ISSDC BENGALURU

issdc@istrac.gov.in

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