 |
| Titel |
Field-aligned current associated with low-latitude plasma blobs as observed by the CHAMP satellite |
| VerfasserIn |
J. Park, H. Lühr, C. Stolle, M. Rother, K. W. Min, I. Michaelis |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
0992-7689
|
| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 28, no. 3 ; Nr. 28, no. 3 (2010-03-02), S.697-703 |
| Datensatznummer |
250016795
|
| Publikation (Nr.) |
 copernicus.org/angeo-28-697-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| Here we give two examples of low-latitude plasma blobs accompanied by
linearly polarized perpendicular magnetic deflections which imply that
associated field-aligned currents (FACs) have a 2-D sheet structure located at
the blob walls. The estimated FAC density is of the order of 0.1 μA/m2. The direction of magnetic deflections points
westward of the magnetic meridian and there is a linear correlation between
perpendicular and parallel variations. All these properties are similar to
those of equatorial plasma bubbles (EPBs). According to CHAMP observations
from August 2000 to July 2004, blobs show except for these two good examples
no clear signatures of 2-D FAC sheets at the walls. Generally, perpendicular
magnetic deflections inside blobs are weaker than inside EPBs on average. Our
results are consistent with existing theories: if a blob exists, (1) a
significant part of EPB FAC will be closed through it, exhibiting similar
perpendicular magnetic deflection inside EPBs and blobs, (2) the FAC closure
through blobs leads to smaller perpendicular magnetic deflection at its
poleward/downward side, and (3) superposition of different FAC elements might
result in a complex magnetic signature around blobs. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|