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lcx366 / ATMOS

A python package to estimate the atmosphere parameters
MIT License
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Welcome to ATMOS

PyPI version shields.io PyPI pyversions PyPI status GitHub contributors Maintenance GitHub license Documentation Status

This package is an archive of scientific routines that estimates the vertical structure of atmosphere with various atmospheric density models, such as Exponential(-0.611\~1000 km), COESA76(-0.611\~1000 km), NRLMSISE-00(0\~2000 km), and JB2008(90\~2500 km).

The NRLMSISE-00 model was developed by the US Naval Research Laboratory. It is based on mass spectrometry and incoherent radar scatter data, also incorporates drag and accelerometer data, and accounts for anomalous oxygen at high altitudes(>500 km). It is recommended by the International Committee on Space Resarch (COSPAR) as the standard for atmospheric composition. Two indices are used in this model: F10.7 (both the daily solar flux value of the previous day and the 81-day average centred on the input day) and $A_p$ (geomagnetic daily value).

The JB2008 (Jacchia-Bowman) model is a newer model developed by Space Environment Technologies(SET) and the US Air Force Space Command. The model accounts for various phenomena related to EUV heating of the thermosphere and uses the DST index as the driver of global density changes. The model is complementary to the NRLMSISE00 model and is more accurate during times of high solar activity and geomagnetic storms. It is recommended by COSPAR as the standard for thermospheric density in satellite drag calculations. Four solar indices and two geomagnetic activity indices are used in this model: F10.7 (both tabular value one day earlier and the 81-day average centred on the input time); S10.7 (both tabular value one day earlier and the 81-day average centred on the input time); M10.7 (both tabular value five days earlier and the 81-day average centred on the input time); Y10.7 (both tabular value five days earlier and the 81-day average centred on the input time); $a_p$ (3 hour tabular value); and DST (converted and input as a dTc temperature change tabular value on the input time).

The Exponential returns

The COESA76 returns

The NRLMSISE-00 returns

The JB2008 returns

How to install

On Linux, macOS and Windows architectures, the binary wheels can be installed using pip by executing one of the following commands:

pip install pyatmos
pip install pyatmos --upgrade # to upgrade a pre-existing installation

How to use

Exponential

>>> from pyatmos import expo
>>> expo_geom = expo([0,20,40,60,80]) # geometric altitudes by default
>>> print(expo_geom.rho) # [kg/m^3]
>>> # expo_geop = expo([0,20,40,60,80],'geopotential') # geopotential altitudes

[1.22500000e+00 7.76098911e-02 3.97200000e-03 3.20600000e-04
 1.90500000e-05]

COESA 1976

>>> from pyatmos import coesa76
>>> coesa76_geom = coesa76([0,20,40,60,80]) # geometric altitudes by default
>>> print(coesa76_geom.rho) # [kg/m^3]
>>> print(coesa76_geom.T) # [K]
>>> print(coesa76_geom.P) # [Pa]
>>> # coesa76_geop = coesa76([0,20,40,60,80],'geopotential') # geopotential altitudes

[1.22499916e+00 8.89079563e-02 3.99535051e-03 3.09628985e-04
 1.84514759e-05]
[288.15       216.65       250.35120115 247.01740767 198.63418825]
[1.01325000e+05 5.52919008e+03 2.87122194e+02 2.19548951e+01
 1.05207648e+00]

NRLMSISE-00

Before using NRLMSISE-00, the space weather data needs to be prepared in advance.

>>> from pyatmos import download_sw_nrlmsise00,read_sw_nrlmsise00
>>> # Download or update the space weather file from www.celestrak.com
>>> swfile = download_sw_nrlmsise00() 
>>> # Read the space weather data
>>> swdata = read_sw_nrlmsise00(swfile) 
>>> from pyatmos import nrlmsise00
>>> # Set a specific time and location
>>> t = '2014-07-22 22:18:45' # time(UTC) 
>>> lat,lon,alt = 25,102,600 # latitude, longitude in [degree], and altitude in [km]
>>> nrl00 = nrlmsise00(t,(lat,lon,alt),swdata)
>>> print(nrl00.rho) # [kg/m^3]
>>> print(nrl00.T) # [K]
>>> print(nrl00.nd) # composition in [1/m^3]

1.714115212984513e-14
765.8976564552341
{'He': 645851224907.2849, 'O': 456706971423.5056, 'N2': 531545420.00015724, 'O2': 2681352.1654067687, 'Ar': 406.9308900607773, 'H': 157249711103.90558, 'N': 6759664327.87355, 'ANM O': 10526544596.059282}

JB2008

Before using JB2008, the space weather data needs to be prepared in advance.

>>> from pyatmos import download_sw_jb2008,read_sw_jb2008
>>> # Download or update the space weather file from https://sol.spacenvironment.net
>>> swfile = download_sw_jb2008() 
>>> # Read the space weather data
>>> swdata = read_sw_jb2008(swfile) 
>>> from pyatmos import jb2008
>>> # Set a specific time and location
>>> t = '2014-07-22 22:18:45' # time(UTC) 
>>> lat,lon,alt = 25,102,600 # latitude, longitude in [degree], and altitude in [km]
>>> jb08 = jb2008(t,(lat,lon,alt),swdata)
>>> print(jb08.rho) # [kg/m^3]
>>> print(jb08.T) # [K]

1.2991711750265394e-14
754.2803276187265

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