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York Soaring Association Glider Field, Arthur East, West Garafraxa Co., Ontario;  September 6, 1998;
Co-ordinates = 4350'N, 8025'W;  Altitude = 474 m;  
Magnetic Declination = 9W (Subtract 9 for True);  Magnetic Inclination = 72.50;  
Observer:  David Gibo, Marilyn Hanna
Num.    Species    Time Flight Behaviour Weather Field Notes
I     II     III IV Va Vb Part 1 Part 2 Part 3
Est.
 Alt.
  
Type
of Flt.
Horiz.
Path
Vert.
Path
Mag.
Bear.
Mag.
Head.
Wind
Dir.
 Wind 
Vel.
Amb.
Temp.
Thrm.
Act.
Cloud 
Types 
1 Danaus plexippus 4:56 45 m glide, soar straight,
circle
descend
climb
157 approx.
90
right
324 3 m/s 26.0C yes cumulus Observations were made at SE end of the main runway.  Butterfly glided down from 45 m, encountered a thermal and began circling and climbing.  An Anax junius  was seen briefly in the field of view about 10 minutes after D. plexippus.  Wind had veered from W in the morning to NW by late afternoon in advance of an approaching cold front.  A large dragonfly (Anax junius) was seen about 10 minutes after butterfly.
Quit

-

5:36 - - - - - - 323 1.3 m/s 23.0C yes cumulus

Gliders were soaring.