12,000

We have over 12,000 students, from over 100 countries, within one of the safest campuses in the UK

93%

93% of Lancaster students go into work or further study within six months of graduating

Home > Research > Publications & Outputs > Magnetosphere response to high-speed solar wind...
View graph of relations

« Back

Magnetosphere response to high-speed solar wind streams: A comparison of weak and strong driving and the importance of extended periods of fast solar wind

Research output: Contribution to journalJournal article

Published

???articleNumber???A00L05
Journal publication date05/2012
JournalJournal of Geophysical Research
Volume117
Number of pages19
Original languageEnglish

Abstract

Much attention has been focused on the reaction of the magnetosphere to the solar wind during the recent extended solar minimum (2006–2010). Although this period was exceptionally quiet when categorized by some parameters (e.g., the number of sunspots) the solar wind still contained features which impacted the Earth's magnetosphere and caused geomagnetic disturbances. Recurrent corotating interaction regions (CIRs) and associated high-speed solar wind streams (HSSs) are typically associated with the declining phase of the solar cycle and were a regular feature of the solar wind during the most recent solar minimum. Here we compare and contrast strong and weak HSSs in the solar wind and their subsequent effect within the Earth's magnetosphere. We find significant differences between strong and weak HSS effects in the plasmasphere, in the ion and electron plasma sheets, and in the outer electron radiation belt. A density-temperature description of the outer radiation belt is shown to shed light on why the radiation belt flux is observed to return at a higher level after the arrival of strong HSSs than before strong HSSs and why the flux is observed to return at a lower level after the arrival of weak HSSs than before weak HSSs.

Bibliographic note

©2012. American Geophysical Union. All Rights Reserved.