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HUOM! OPINTOJAKSOJEN TIETOJEN TÄYTTÄMISTÄ KOORDINOIVAT KOULUTUSSUUNNITTELIJAT HANNA-MARI PEURALA JA TIINA HASARI

 

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1. Course title

Sähkömagneettinen sironta ja absorptio
Elektromagnetisk spridning och absorption
Electromagnetic scattering and absorption


2. Course code

PAP314

Aikaisemmat leikkaavat opintojaksot 53864 Sähkömagneettinen sironta ja absorptio, 5 op


3. Course status: optional

-Which degree programme is responsible for the course?
Master’s Programme in Particle Physics and Astrophysical Sciences

-Which module does the course belong to?
PAP300 Advanced Studies in Particle Physics and Astrophysical Sciences (optional for Study Track in Astrophysical Sciences)
ATM300 Advanced Studies in Atmospheric Sciences (optional for Study Track in Meteorology)

-Is the course available to students from other degree programmes?
Yes


4. Course level (first-, second-, third-cycle/EQF levels 6, 7 and 8)

Master’s level, degree programmes in medicine, dentistry and veterinary medicine = secondcycle
degree/EQF level 7
Doctoral level = third-cycle (doctoral) degree/EQF level 8

-Does the course belong to basic, intermediate or advanced studies (cf. Government Decree
on University Degrees)?
Advanced studies


5. Recommended time/stage of studies for completion


The theoretical astrophysics package in the B.Sc. programme for physical sciences.


6. Term/teaching period when the course will be offered


The course is offered in the spring term, in IV period, every other year.

7. Scope of the course in credits

5 cr

8. Teacher coordinating the course

Karri Muinonen and Dmitri Moisseev

9. Course learning outcomes

Electromagnetic Scattering and Absorption" is the first advanced course on elastic electromagnetic scattering by arbitrary objects (usually called particles). As compared to the wavelength, the sizes of the objects can be small or large, or of the order of the wavelength.  As to the shape of the objects, the main emphasis is on spherical particles and, subsequently, on the so-called Mie scattering. The optical properties of the objects are typically described by the refractive index. During the course, the student will become familiar with the concepts of electromagnetic scattering and will learn how to use existing computer codes in astronomical and atmospheric applications.

10. Course completion methods


The course can also be taken individually with flexible timing after a discussion and planning session with the lecturers.

11. Prerequisites

Theoretical astrophysics package in the B.Sc. programme for physical sciences.

12. Recommended optional studies


Electromagnetic Scattering I & II

13. Course content

In the beginning, classical electromagnetics is reviewed, intrododucing the Maxwell equations. Then follows the necessary framework for the classical scattering theory with the definitions for the Stokes parameters and Mueller matrices, as well as for the 2 x 2 scattering amplitude matrix and the 4 x 4 scattering matrix.

During the first three weeks, an introduction is offered to homogeneous plane waves, Fresnel reflection and refraction on a planar interface, as well as Mie scattering. During the second three weeks, the Rayleigh approximation (sphere and spheroid), the Rayleigh-Gans approximation, and the effective media approximation are assessed. Finally, applications are introduced in astronomy and radar meteorology.

The project and the exercises on the course will concern ray optics, Mie scattering, comparison of Rayleigh and Mie scattering in terms of applicability range, basic polarisation variables from the Rayleigh spheroid, and effective media approximation (scattering from snowflakes or melting particles, for example).

Towards the end of the course, the student will learn about the free existing softwares for scattering by nonspherical particles, such as the Amsterdam Discrete-Dipole Approximation code ADDA and the Superposition T-Matrix Method code MSTM (Multiple-Sphere T-Matrix).

14. Recommended and required literature

Set reading:

K. Muinonen, Electromagnetic Scattering I, Lecture Notes, 2012 (latest draft)

C. F. Bohren & D. R. Huffman, Absorption and Scattering of Light by Small Particles, Wiley & Sons, 2010

J. D. Jackson, Classical Electrodynamics, Wiley & Sons, 1998

Supplementary reading:

H. C. van de Hulst, Light Scattering by Small Particles, Wiley & Sons, 1957 (Dover, 1981)

M. I. Mishchenko, J. W. Hovenier, \& L. D. Travis, Light Scattering by Nonspherical Particles, Academic Press, 2000

M. I. Mishchenko, L. D. Travis & A. A. Lacis, Scattering, Absorption, and Emission of Light by Small Particles, Cambridge University Press, 2002

A. Doicu, Y. Eremin & T. Wriedt, Acoustic & Electromagnetic

Scattering Analysis Using Discrete Sources, Academic Press, 2000

15. Activities and teaching methods in support of learning

The course is composed of exercises, a project, and a final exam.

16. Assessment practices and criteria, grading scale

The grading scale for accepted outcomes is 1-5 based on the final exam and the bonus points obtained from the exercises and the project work.

17. Teaching language

English


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