Module: msisAtmosphere

Executive Summary

Atmosphere class used to calculate temperature / density above a body using multiple models. This class is used to hold relevant atmospheric properties and to compute the density for a given set of spacecraft relative to a specified planet. Planetary parameters, including position and input message, are settable by the user. Internal support is provided for Venus, Earth, and Mars. In a given simulation, each planet of interest should have only one MsisAtmosphere model associated with it linked to the spacecraft in orbit about that body. For more information see the PDF Description.

Message Connection Descriptions

The module is a sub-class of the Module: atmosphereBase base class. See that class for the nominal messages used and general instructions.

The following table lists all the module specific input and output messages. The module msg connection is set by the user from python. The msg type contains a link to the message structure definition, while the description provides information on what this message is used for.

Module I/O Messages

Msg Variable Name

Msg Type




vector of 23 space weather data input messages

Regarding the vector swDataInMsgs, the order of these 23 messages must follow this message order:

0 - ap_24_0
1 - ap_3_0
2 - ap_3_-3
3 - ap_3_-6
4 - ap_3_-9
5 - ap_3_-12
6 - ap_3_-15
7 - ap_3_-18
8 - ap_3_-21
9 - ap_3_-24
10 - ap_3_-27
11 - ap_3_-30
12 - ap_3_-33
13 - ap_3_-36
14 - ap_3_-39
15 - ap_3_-42
16 - ap_3_-45
17 - ap_3_-48
18 - ap_3_-51
19 - ap_3_-54
20 - ap_3_-57
21 - f107_1944_0
22 - f107_24_-24

class MsisAtmosphere : public AtmosphereBase
#include <msisAtmosphere.h>

MSIS athomsphere model.

Public Functions


This method initializes some basic parameters for the module.







Public Members

std::vector<ReadFunctor<SwDataMsgPayload>> swDataInMsgs

Vector of space weather input message names.

int epochDoy

[day] Day-of-Year at epoch

std::string epochInMsgName

epoch input msg name

BSKLogger bskLogger

&#8212; BSK Logging

Private Functions

void customWriteMessages(uint64_t CurrentClock)

This method is used to write the output densities whose names are established in AddSpacecraftToModel.


CurrentClock – The current time used for time-stamping the message



bool customReadMessages()

This method is used to read the incoming command message and set the associated spacecraft positions for computing the atmosphere.



void customReset(uint64_t CurrentClock)

This method is used to reset the module.



bool ReadInputs()
void updateInputParams()
void updateSwIndices()
void evaluateAtmosphereModel(AtmoPropsMsgPayload *msg, double currentTime)
void customSetEpochFromVariable()

Custom customSetEpochFromVariable() method. This allows specifying epochDoy directly from Python. If an epoch message is set then this variable is not used.



Private Members

Eigen::Vector3d currentLLA

[-] Container for local Latitude, Longitude, Altitude geodetic position; units are rad and km respectively.

std::vector<SwDataMsgPayload> swDataList

Vector of space weather messages.

nrlmsise_input msisInput

Struct containing NRLMSISE-00 input values; see their doc for details.

nrlmsise_output msisOutput

Struct containing NRLMSISE-00 output values; see their doc for details.

nrlmsise_flags msisFlags
ap_array aph
double ap
double f107
double f107A