SIO229: Geomagnetism 2013

Instructor: Bob Parker

Prolog

This is the new website for Part 2 of SIO229, Geomagnetism. I will post information about the class on this site, most importantly, notes covering my lectures, and homework, in PDF form. You should consult this site before each class to download the notes, and for news about room changes, etc.

Notes

These are the notes that form the basis of the class.
Notes 1; pp 1-14
Notes 2; pp 15-37
Notes 3; pp 38-55
Notes 4; pp 56-63
Notes 5; pp 64-71

Diary

2/25/2013 Lecture 4
Gauss's theory of the main field; separation into internal and external parts; upward and downward continuation. Notes, pp 16-21.
Homework set 1. Due next Monday.
In your answers explain what you are doing in English. Homework consisting entirely of pages of algebra will be given no credit.

2/27/2013 Lecture 5
Geomagnetic field modeling; the Lowes spectrum. Notes, pp 22-33.

Having completed the homework myself, I conclude it is probably a bit too much work. So to reduce the burden I ask now that everyone do Question 3, and choose either Question 1 or Question 2. Please don't all select the same one.

3/01/2013 Lecture 6
Toroidal and Poloidal fields, Notes, pp 34-37.

I should mention that if you need to map geomagnetic fields on the surface or at the top of the core based on the IGRF or other models, or you need values at a point, these can easily be generated by magmap, a Fortran based system found on my website.

3/04/2013 Lecture 7
Magnetohydrodynamics and the core, Notes pp 38-43.

The first homework set of Geomagnetism is due today. No late subsmissions, please.
Homework set 2. You will also need this table of IGRF coefficients for 2010. Due next Monday.

3/05/2013 I have been asked today to invite you to visit the course evaluation website for obvious reasons.

3/06/2013 Lecture 8
More on secular variation, Notes pp 43-52.

Here is my solution to the first homework set.

3/07/2013 I found this link to a picture of the Glatzmaier-Roberts dynamo model in action. By way of contrast, here is picture of the geomagnetic field at the other end of the content-glitz spectrum.

3/08/2013 Lecture 9
The Frozen Flux hypothesis; tests, Notes pp 44-55.

I think the derivation of Alfven's theorem was a bit opaque, so here is picture to help see it. Also here is a little diagram for the Frozen Flux condition.

3/09/2013 Here is Homework set 3, the last one. Since there is no class on March 18, the homework is due on Friday, 3/15/2013.

3/11/2013 Lecture 10
Crustal magnetic fields, Notes 56-63.

Here are some additional notes on crustal magnetic anomalies.

3/13/2013 Lecture 11
The magnetic annihilator; filter theory for marine anomalies, Intro to EM induction, Notes 60-66.

I have now posted the solution to Homework set 2.

3/15/2013 Lecture 12
Electromagnetic induction in the Earth, Notes 64-71

In class today I referred to Medin, A. E., Parker, R. L., and Constable, S., Physics of the Earth and Planetary Interiors, 160, 51-9, doi:10.1016/j.pepi.2006.09.001, 2007. Here is a reprint for those interested.

Thank you for your hard work in this course.

3/22/2013 Here is my solution to homework set 3. I will give your papers to Dr Borsa if you wish to collect them, since I am only infrequently at IGPP.

4/5/2013 I have removed files linked to homework and solutions. If you need anything I have deleted, please get in touch with me directly.