I am working on a project that requires extracting solar heat flux, a derived variable that does not appear in the standard list of available responses in my simulation software.

I am following the ACU-T: 3201 / SL-2130 tutorial on solar radiation and thermal shell. I am considering using a "User Defined Response" to obtain this specific variable. I need guidance on how to invoke a specific result and write it into the "User Defined Response." Additionally, I would like to know if there is a list of commands available to perform this task and how to handle different time steps when calculating solar heat flux. I am looking forward to a prompt response to proceed with my project.