AIP for Mongolia (section ENR-5.3) valid from 09 MAR 2023

ENR 5.3 Other activities of a dangerous nature and other potential hazards

1. Other activities of a dangerous nature

1.1 Launching a weather balloon

1.1.1 National Agency for Meteorology and Environment Monitoring is launching weather observation balloons in regular hours a daily basis for the purpose of observation of meteorological elements in the upper layer of atmosphere.

1.1.2 The balloons are filled with hydrogen and carry suspended radiosonde equipment. In average, observations last for 100-120min and the direction of release and location where it burst depend on the weather conditions of the launch day.

Weight of balloons: 500-750gr
Weight of radiosonde equipment: 130gr
Rate of climb: 280-550m/min (in the direction of the wind)
Travel distance: 100-200km

1.1.3 List of sites from which balloons are launched is provided in the table below.

Name of station	Location	Elevation /m/	Type of radiosonde	Balloon’s Weight /gr/	Range/km/	Time of activity (UTC)	Average height /km/	Maximum height /km/
Ulaanbaatar	475507N 1065052E	1310	M-10	600	120-130	daily 00:00, 12:00	25	45
Dalanzadgad	433703N 1042509E	1470	GTS1-2	750	100-130	daily 00:00, 12:00	33	43
Ulaangom	494800N 920407E	939.4	RS41-SG	500	180-200	daily 12:00	27	36
Muren	493812N 1000912E	1288	RS41-SG	500	200	daily 00:00	30	38.2

2. Other potential hazards

NIL