# Prosiectau Ffiseg ar gyfer myfyrwyr bl.3 a bl.4

### The geomagnetic field of an equatorial station

#### (supervisor: Heather McCreadie)

Nature of project: data analysis, theory

Available to students on full-time physics degree schemes or joint students.

#### Project description and methodology

A magnetic station called Huancayo sits near the geomagnetic equator. Some of the data have never been digitised from the year books. The data will be digitised for 1981. Simple data validation techniques will be used to make sure the input is correct. The data analysis will then focus on separating the signals from each source.

What is contained within this geomagnetic measurement? How many magnetic sources are within the Geospace and internal Earth environment? For the position of the station what is the expectation within the measurements over one year? Can the secular variation from the internal dynamo be seen? Is the Sq variation visible? If not, why? Are some questions which could be answered.

This project will allow the student to create a set of routines to read a specific set of data. Using these routines some analysis will be performed.

A successful project will develop beyond the above in one/some of the following directions:
Digitising the data for more than one year so a long term analysis can be completed would benefit this area of work.

A theoretical aspect may be employed if a forecasting model were to be implemented. This would require analysis of other sources.

When considering where to take your project, please bear in mind the time available. It is preferable to do fewer things well than to try many and not get conclusive results on any of them. However, sometimes it is useful to have a couple of strands of investigation in parallel to work on in case delays occur.

Additional scope or challenge if taken as a Year-4 project: Data analysis techniques involving statistical methods and signal processing techniques may be employed. The student can choose to focus on one current source or an event within the data if one exists.

Please speak to Heather McCreadie (hem18) if you consider doing this project.

Initial literature for students:

1. Archana, R. K., Phani Chandrasekhar, N., Arora, K., & Nagarajan, N. (2018). Constraints on scale lengths of equatorial electrojet and counter electrojet phenomena from the Indian sector. Journal of Geophysical Research: Space Physics, 123. https://doi.org/10.1029/2018JA025213
2. J. Jankowski and C. Sucksdorff IAGA Guide for Magnetic Measurements and Observatory Practice(1996) ISBN: 0-9650686-2-5 Electronic version
3. S. Chapman and Bartells, J. (1962) Geomagnetism, Volume 1, Clarendon Press
4. C. Agodi Onwumechili. (1997) The equatorial electrojet, Amsterdam : Gordon and Breach, c1997. ISBN : 9056990691

#### Novelty, degree of difficulty and amount of assistance required

Digiting the data is a skill which needs to be learned. Full assistance will be given.

Learning Matlab.

#### Project milestones and deliverables (including timescale)

milestoneto be completed by
Digitised the data and checked it end of October
Matlab expertise shown in creating some plots.Christmas
Elements of each source identified within the dataend of February
Choose the area of specialisation (e.g. an event or signal type) and analyse it.Easter