SAIP2014

Polarity changes of small-amplitude ion-acoustic and electron-acoustic solitons in multi-fluid space plasmas

8 Jul 2014, 10:20

20m

D Les 204

Oral Presentation Track D2 - Space Science Space

Speaker

Dr Carel Olivier (South African National Space Agency)

Would you like to <br> submit a short paper <br> for the Conference <br> Proceedings (Yes / No)?

No

Apply to be<br> considered for a student <br> &nbsp; award (Yes / No)?

No

Main supervisor (name and email)<br>and his / her institution

Dr. Shimul Maharaj smaharaj@sansa.org.za

Level for award<br>&nbsp;(Hons, MSc, <br> &nbsp; PhD)?

N/A

Abstract content <br> &nbsp; (Max 300 words)<br><a href="http://events.saip.org.za/getFile.py/access?resId=0&materialId=0&confId=34" target="_blank">Formatting &<br>Special chars</a>

The properties of ion-acoustic and electron-acoustic solitons are studied for fluid models describing three-component and four-component space plasmas. Each plasma model is composed of one or two (different temperatures but same mass) ion species and one or two (different temperatures) electron species. We use a reductive perturbation method to derive Korteweg- deVries equations that describe small-amplitude solitons for each model. The results are shown to be in good agreement with arbitrary amplitude soliton results available in the literature. A comparison of the results for the different models will provide insight into how polarity changes in the observed soliton structures are related to the plasma composition.