urn:nasa:pds:vl_seis_derived:data_derived:event_wind_summary 1.0 1.21.0.0 Product_Observational 2024-05-02 1.0 Initial Version. 1976-09-04T00:53:01Z 1978-03-17T06:52:23Z Viking Mission urn:nasa:pds:context:investigation:mission.viking data_to_investigation Viking Lander 2 Host urn:nasa:pds:context:instrument_host:spacecraft.vl2 is_instrument_host Seismometer for VL2 Instrument urn:nasa:pds:context:instrument:seis.vl2 is_instrument Mars Planet urn:nasa:pds:context:target:planet.mars data_to_target event_mode Primary_Mission Extended_Mission 0 560 event_wind_summary.tab 2016-12-12 0 256087 This file is a summary of the Viking Seismometer Data Event mode records, intended as a high-level index to events of interest, and for large-scale correlation with meteorological data. In Event mode, raw readings were compressed in the instrument itself by recording the number of positive-going zero crossings in a 1.01s interval, and recording an envelope value generated by digital filtering. For details see VPDS_EVENT_WINDS_FORMAT.TXT in the DOCUMENT directory. Time is Local Lander Time. Carriage-Return Line-Feed 24 0 152 archived_record_number 1 1 ASCII_Integer 6 An ordinal number indicating the record in the present file and in the corresponding archive files (VPDS_EVENT_XAMP.CSV etc.) Note that those files only carry the records with 51 readings, hence there are fewer records in the archive file than in the present summary. seismic_time_sols 2 7 ASCII_Real 12 The mission time in decimal Sols (i.e. sol+(hr*3600.0+min*60.0+sec)/88775.0). original_file_number 3 19 ASCII_Integer 6 The file number of the original data (i.e. file number 0101 corresponds to VUSA.0101). original_record_number 4 25 ASCII_Integer 7 The line number in the original VUSA file to which the present record corresponds. data_acquisition_sol 5 32 ASCII_Integer 4 The sol number on which the data were acquired. Landing day is sol 0. data_acquisition_hour 6 36 ASCII_Integer 4 The hour of acquisition end. data_acqusition_minute 7 40 ASCII_Integer 4 The minute of acquisition end. data_acquisition_second 8 44 ASCII_Integer 4 The second of acquisition end. Note that the data in the VUSA file are reported at 1Hz, thus the end of acquisition is typically 51 seconds after this time. median_x_axis 9 48 ASCII_Integer 5 The median X-axis reading. 1 digital unit (DU) corresponds roughly to 2nm at 3Hz (see seismic_dataset.txt). first_x_axis 10 53 ASCII_Integer 5 The first X-axis reading in the record. maximum_x_axis 11 58 ASCII_Integer 5 The maximum X-axis reading in the record. minimum_x_axis 12 63 ASCII_Integer 5 The minimum X-axis reading in the record. rms_x_axis_x100 13 68 ASCII_Integer 6 100 times the RMS X-axis reading. rms_y_axis_x100 14 74 ASCII_Integer 6 100 times the RMS Y-axis reading. rms_z_axis_x100 15 80 ASCII_Integer 6 100 times the RMS Z-axis reading. mean_x_axis_crossings 16 86 ASCII_Integer 5 The mean number of X-axis zero-crossings in the record. mean_y_axis_crossings 17 91 ASCII_Integer 5 The mean number of Y-axis zero-crossings in the record. mean_z_axis_crossings 18 96 ASCII_Integer 5 The mean number of Z-axis zero-crossings in the record. meteo_time_sols 19 101 ASCII_Real 11 The mission time in decimal Sols (i.e. sol+(hr*3600.0+min*60.0+sec)/88775.24) of the meteorological data windspeed 20 112 ASCII_Real 7 m/sec nearest windspeed (m/s) value. pressure 21 119 ASCII_Real 7 mbar pressure (mbar). wind_direction 22 126 ASCII_Real 8 deg wind direction (degrees clockwise from North towards which the wind is blowing). air_temperature 23 134 ASCII_Real 8 K Measured air temperature (K). Note that this value has not been screened for possible lander thermal contamination (see Hess et al. 1977; doi:10.1029/JS082i028p04559). wind_seismic_interval 24 142 ASCII_Integer 9 sec Time in seconds between closest wind measurement and the end of the seismic record (for the first and last sol of the file, this value should be ignored). Positive means seismic data obtained after meteorology. event_wind_summary.lbl 0 PDS3 Original PDS3 label. Carriage-Return Line-Feed