urn:nasa:pds:mex_marsis_optim:ionosphere_data:columns_ionosphere 1.0 1.16.0.0 Product_Observational 2007-12-23T17:54:47.7325Z 2021-05-28T06:18:41.0348Z MARS EXPRESS Mission urn:esa:psa:context:investigation:mission.mars_express data_to_investigation MARS EXPRESS Host urn:esa:psa:context:instrument_host:spacecraft.mex is_instrument_host MARSIS Instrument urn:esa:psa:context:instrument:mex.marsis is_instrument Mars Planet urn:nasa:pds:context:target:planet.mars data_to_target columns_ionosphere.tab 0 PDS DSV 1 Column headings of ionosphere data tables containing estimated ionospheric properties for each radargram frame. 1 Carriage-Return Line-Feed Comma 17 0 Frame 1 ASCII_String Radargram frame Ephemeris Time 2 ASCII_String Ephemeris time of observation Time 3 ASCII_String UTC date and time of observation Lat 4 ASCII_String Degree Spacecraft footprint latitude on ellipsoid Lon 5 ASCII_String Degree Spacecraft footprint longitude on ellipsoid Alt 6 ASCII_String Km Spacecraft altitude above ellipsoid SZA 7 ASCII_String Solar zenith angle Channel 1 8 ASCII_String MHz Central frequency used by channel 1 Channel 2 9 ASCII_String MHz Central frequency used by channel 2 Delay 1 10 ASCII_String Microsecond Channel 1 time delay estimate Delay 2 11 ASCII_String Microsecond Channel 2 time delay estimate Channel 1 TEC1 12 ASCII_String Channel 1 TEC1 estimate Channel 1 TEC2 13 ASCII_String Channel 1 TEC2 estimate Channel 1 TEC3 14 ASCII_String Channel 1 TEC3 estimate Channel 2 TEC1 15 ASCII_String Channel 2 TEC1 estimate Channel 2 TEC2 16 ASCII_String Channel 2 TEC2 estimate Channel 2 TEC3 17 ASCII_String Channel 2 TEC3 estimate