Radiosonde measurements from station Boulder, SURFRAD (2019-12)

Start location: Denver, CO; Distance from radiation site: 40 km; If launch time is exactly 00Z or 12Z, the actual launch time is likely unknown起始位置：美国科罗拉多州丹佛市；与辐射站点的距离：40千米；若发射时间恰好为00Z或12Z，则实际发射时间大概率未知。