### Examination of the Dst Index

#### (supervisor: Heather McCreadie)

Nature of project: **data analysis**, theory

Available to
students on full-time physics degree schemes only.

#### Project description and methodology

Dst is a geomagnetic index that is used to identify when a magnetic storm is occurring. In this project the student will delve into the methodology of the index. Sudden commencements will also be researched because they are part of the Dst index. This will include all methodologies presented over the period of the index's life. The current systems that are included in the index will be described and the student will try and reproduce the index using their own algorithm. Part of the ratification process is that anyone should be able to exactly reproduce the Dst index from scratch.

The outcome of this will be the student will have a thorough knowledge of the terrestrial ionosphere/magnetosphere system. The student will be able to use Matlab to program algorthms and analyse data.

*A successful project will develop beyond the above in one/some of the following directions:*

A comparison of the ASY/ASM index with Dst will also be done to develop this project.

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.

*This project is only available as a Y3 project.*

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

*Initial literature for students:*

- http://isgi.unistra.fr/
- P.N. Mayaud, Derivation, Meaning and Use of Geomagnetic Indices, Geophysical Monograph 22, Am. Geophys. Union, Washington D.C., 1980; for a complete review of the present IAGA indices
- IAGA bulletin 40: http://wdc.kugi.kyoto-u.ac.jp/dstdir/dst2/onDstindex.html
- G.K. Rangarajan, Indices of magnetic activity, in Geomagnetism, edited by I.A. Jacobs, Academic, San Diego, 1989

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

Initial help with matlab programming will be given

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

milestone | to be completed by |

understanding of data given shown | end of October |

initial progamming begun. | Christmas |

finalisation of data presentation | end of February |

discussion | Easter |