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# BULLETIN SASIN2 CREATED: 06/12/81 10:51:02 BY ARCALL
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# ATMOSPHERE STRUCTURE EXPERIMENT DATA TAKEN DURING ENTRY OF THE DAY AND NIGHT
# PROBES (SMALL PROBES 2 AND 3) IN THE ALTITUDE RANGE FROM 137 KM TO 70 KM ARE
# NOW ENTERED IN THE SED FILE, AS OF 6/12/81.  NARRATIVE ACCOMPANIES NIGHT PROBE DATA. 
#
# ATMOSPHERE STRUCTURE EXPERIMENT (LAS, SAS)
# ALVIN SEIFF, PRINCIPAL INVESTIGATOR
# DATA DERIVED FROM DECELERATIONS DURING ENTRY OF THE FOUR PIONEER VENUS
# PROBES INTO THE ATMOSPHERE OF VENUS.                                                                             
# 1. LISTED POINTS CORRESPOND TO ACCELEROMETER SAMPLING TIMES.
# 2. ALL ALTITUDES ARE MEASURED RELATIVE TO THE 6052.0 KM RADIUS.
# 3. ATMOSPHERIC STATE PROPERTIES ARE GIVEN IN THE LAST THREE COLUMNS.
# DENSITY IS DERIVED FROM DECELERATION MEASUREMENTS; PRESSURE, FROM INTEGRATION
# OF MEASURED DENSITIES IN THE EQUATION OF HYDROSTATIC EQUILIBRIUM;
# AND TEMPERATURE FROM THE EQUATION OF STATE.  SELECTED MEAN MOLECULAR WEIGHTS
# VARY WITH ALTITUDE, AND WERE DERIVED FROM ONMS AND BNMS DATA (SEIFF AND KIRK, 1981).
# 4. PROBE TRAJECTORY VARIABLES ARE GIVEN IN COLUMNS 3, 4, AND 5.  PROBE
# VELOCITY, PATH ANGLE BELOW HORIZONTAL (GAM,DEG), AND ALTITUDE WERE CALCULATED  
# FROM THE EQUATIONS OF MOTION AND THE MEASURED DECELERATIONS, STARTING FROM
# THE INITIAL VELOCITY AND PATH ANGLE AT ENTRY DETERMINED BY RADIO TRACKING
# PRIOR TO PROBE ENTRY.  ALTITUDE AND VELOCITY AT MODE CHANGE FROM ENTRY
# TO DESCENT WERE CONSTRAINED TO MATCH ALTITUDE AND VELOCITY DERIVED FROM
# DESCENT MODE DATA.  SMALL ADJUSTMENTS WERE MADE TO (A) THE TIME OF ENTRY
# AND (B) THE ACCELEROMETER SCALE-FACTOR RATIO ON THE 600G RANGE TO ACHIEVE THIS MATCH.
#
# STATE PROPERTIES OF THE MIDDLE ATMOSPHERE OF VENUS
# PIONEER VENUS NIGHT PROBE
# THE ALTITUDE REFERENCE IS THE SOUNDER PROBE LANDING SITE AT 6052.0 KM,
# WHERE G = 8.8694 M/SEC**2
# GRT(HR MIN),GRT(SEC),ALT(KM),V(KM/S),GAM(DEG),RHO(KG/M3),P(MB),T(DEGK),COMMENT