Loading...
Please wait, while we are loading the content...
Similar Documents
Constraints on cme evolution from in situ observations of ionic charge states
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Lepri, Susan T. Gruesbeck, Jacob R. Zurbuchen, Thomas H. Antiochos, Spiro K. |
| Copyright Year | 2010 |
| Description | We present a novel procedure for deriving the physical properties of Coronal Mass Ejections (CMES) in the corona. Our methodology uses in-situ measurements of ionic charge states of C, O, Si and Fe in the heliosphere and interprets them in the context of a model for the early evolution of ICME plasma, between 2 - 5 R-solar. We find that the data can be fit only by an evolution that consists of an initial heating of the plasma, followed by an expansion that ultimately results in cooling. The heating profile is consistent with a compression of coronal plasma due to flare reconnect ion jets and an expansion cooling due to the ejection, as expected from the standard CME/flare model. The observed frozen-in ionic charge states reflect this time-history and, therefore, provide important constraints for the heating and expansion time-scales, as well as the maximum temperature the CME plasma is heated to during its eruption. Furthermore, our analysis places severe limits on the possible density of CME plasma in the corona. We discuss the implications of our results for CME models and for future analysis of ICME plasma composition. |
| File Size | 2797564 |
| Page Count | 36 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20110007807 |
| Archival Resource Key | ark:/13960/t7jq5zh1m |
| Language | English |
| Publisher Date | 2010-01-01 |
| Access Restriction | Open |
| Subject Keyword | Solar Physics In Situ Measurement Solar Corona Ulysses Mission Solar Flares Coronal Mass Ejection Space Weather Advanced Composition Explorer Heliosphere Plasma Compression Solar Spectrometers Plasma Composition Coronagraphs Solar Wind Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
