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[hongxuekai]

	hongxuekai
hongx...@mail.dlut.edu.cn

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Hello,

Thank you very much for your Mie scattering simulation software. Recently, I have encountered a problem. I used the aerosol particle spectrum provided by NASA-AERONET, the complex refractive index input to MieSimulatorGUI to get the phase function and the NASA-AERONET phase function comparison, and found that their trend is more consistent. However, there are differences in intensity. Then, it is found that MieSimulatorGUI does not satisfy the normalization condition of the phase function, and that NASA-AERONET satisfies the phase function. My question is, why are they so different? As shown in the attachment. Looking forward to your reply.

thanks!

[hongxuekai]

	hongxuekai
hongx...@mail.dlut.edu.cn

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Hello,

Thank you very much for your Mie scattering simulation software. Recently, I have encountered a problem. I used the aerosol particle size distribution provided by NASA-AERONET, the complex refractive index input to MieSimulatorGUI to get the phase function and the NASA-AERONET phase function comparison, and found that their trend is more consistent. However, there are differences in intensity. Then, it is found that MieSimulatorGUI does not satisfy the normalization condition of the phase function, and that NASA-AERONET satisfies the normalization condition of the phase function.

[Janaka]

Hi Hongxuekai,

Thanks for your question.

I am not familiar with the underlying code of AERONET.  However, I found a document in the AERONET site that says " Aerosol particles are assumed to be partitioned into two components: spherical and non-spherical. The spherical component is modeled by an ensemble of polydisperse, homogeneous spheres (complex index of refraction is the same for particles of all sizes). The non-spherical component is a mixture of polydisperse, randomly-oriented homogeneous spheroids"

 https://aeronet.gsfc.nasa.gov/new_web/Documents/Inversion_products_for_V3.pdf

Our Mie simulator GUI software considers only spherical particles in monodisperse and poly disperse distributions. 

We normalized |S1| + |S2|  by 2 π (xParameter) (xParameter) (Qsca) to calculate the phase function. AERONET could have used a different factor. { Σ(|S1| + |S2|)?}  Different normalization factors have been used in phase function normalizations. Read https://miepython.readthedocs.io/en/latest/03a_normalization.html

Best

Janaka

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[hongxuekai]

Thank you for the Janaka,

So that is your normalization software?

	hongxuekai
hongx...@mail.dlut.edu.cn

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[Janaka]

Hi 

Your question is not clear to me.

For more information, see

https://github.com/VirtualPhotonics/MieSimulatorGUI

Best

Janaka

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[hongxuekai]

The kind of normalization that your software takes.

	hongxuekai
hongx...@mail.dlut.edu.cn

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[Janaka]

We normalized |S1| + |S2|  by 2 π (xParameter) (xParameter) (Qsca) to calculate the phase function. 

Janaka

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[hongxuekai]

Ok, thank you very much!

	hongxuekai
hongx...@mail.dlut.edu.cn

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