 |
| Titel |
Observations of Ion Heating in Inverted-V Structures in the High-Latitude Plasma Sheet Boundary Layer |
| VerfasserIn |
Yanbo Cui, Suiyan Fu, George Parks, Qiugang Zong, Zuyin Pu, Lun Xie, Weijie Sun, Xi Bai, Xi Chen |
| Konferenz |
EGU General Assembly 2014
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 16 (2014) |
| Datensatznummer |
250092235
|
| Publikation (Nr.) |
 EGU/EGU2014-6566.pdf |
|
|
|
|
|
| Zusammenfassung |
| Ion beams of H+, He+ and O+ were observed escaping the Earth’s ionosphere by Cluster
when the satellites crossed the high latitude plasma sheet boundary layer (PSBL) in the
southern hemisphere. These beams appear as inverted-V structures in the energy flux
spectrograms. The pitch angles of the beams are ~0 to 30o, hence these are ions streaming
out of the ionosphere. These beams in the inverted-V structures occur with another ion
population of ring-shaped distribution. These beams show the parallel temperature (T||)
increases as the streaming velocity of the beam increases indicating the beams are being
heated as they are accelerated by the field-aligned negative U-shaped potentials in the auroral
acceleration region (AAR). The streaming velocity ranges from a few tens of km/s to several
hundred km/s indicating a potential drop of ~102 to 104 volts. Ions are heated more
in the central U-shaped region than on the sides. These results provide important
new information to modelers and theorists about how the escaping ions are heated. |
|
|
|
|
|
|