# BALLOON
m_pl = 10.0  # payload mass in [kg]
m_film = 1.0  # mass balloon film in [kg]
m_gas = 1.7645  # 1.60391061452  # lifting gas mass in [kg]
V_max = 9999999  # maximum fillable balloon volume in [m^3]

# THERMO-OPTICAL
alpha_VIS = 0.024
r_VIS = 0.06
tau_VIS = 0.916
epsilon = 0.1
alpha_IR = 0.1
tau_IR = 0.86
r_IR = 0.04

c_f = 2092  # [J/(kg*K)]

epsilon_ground = 0.9
Albedo = 0.2
T_ground = 273.15

# DRAG
c_d = 0.47       # drag coefficient balloon (spherical) [-]

c_virt = 0

# SIMULATION
t_end = 10000                          # maximum simulation time in [s]
dt = 0.1                              # simulation time step in [s]
start_height = 0.0                     # start altitude in [m]
start_lat = 0.0                       # start latitude in [deg]
start_lon = 0.0                        # start longitude in [deg]
start_utc = '2020-12-13 12:00:00.000'  # start date and time in UTC
p_0 = 1013.25  # sea-level pressure