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left arrowarrow leftTable X m -  Page 81
Airport in Calhoun, Georgia;  October 7, 1987;    
(Magnetic Declination = 2°W:  Subtract 2° for True Bearing, True Heading and True Wind Direction)
Num.    Species    Time Flight Behavior Weather Field Notes
    I         II     III IV Va Vb Part 1 Part 2 Part 3
 Est.
Alt.
Type
of Flt.
Horiz.
Flt.
Vert.
Flt.
Mag.
Bear.
Mag.
Head.
Wind
Dir.
 Wind 
Vel.
Amb.
Temp
Thrm.
Act.
Cloud 
Types 
- - 4:32 - - - - - - - - - yes - WW:  Radar showed that there were multiple targets in a thermal that was 1.6 km in diameter and 1.6 km high.
- - 4:35 - - - - - - - - - yes - Vultures were soaring.
- - 4:43 - - - - - - - - - - - WW:  A blue sky thermal (no cumulus cloud) was approaching.
382 D. plexippus 4:48 30 m soar circle level 103° - 340° 2.2 m/s - yes - Butterfly drifted downwind while soaring in circles at 30 m.  A swift approached the butterfly then turned away.
383 D. plexippus 4:53 7 m soar,
glide,
soar
circle,
straight,
circle
descend,
climb
140° right 318° 1.8 m/s - yes - John Westbrook's observation:  Butterfly was circling in a thermal when it left and glided down to 7 m, encountered a second thermal, began to circle and soar again and climbed to 12 m.  Vultures were soaring
384 D. plexippus 5:04 15 m soar circle,
straight,
circle
level 157° 210° 323° 2.2 m/s - yes - Alton Spark's observation:  Butterfly soared in circles and soared straight, but stayed at the same altitude.  John Westbrook reported that air sonde measured an ambient temperature of 2 °C at an altitude of 2 km .