 |
| Titel |
Test and comparison of different approaches of magnetotail magnetic flux calculation. |
| VerfasserIn |
Maria Shukhtina, Evgeni Gordeev, Victor Sergeev, Steve Milan, Peter Boakes |
| Konferenz |
EGU General Assembly 2013
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250079152
|
|
|
|
|
|
| Zusammenfassung |
| Generalization of the earlier used algorithm of magnetotail magnetic flux calculation is
presented. The algorithm develops the Petrinec and Russell, 1996 (PR96) method of
magnetotail radius RT calculation based on simultaneous magnetotail and solar wind
observations. The algorithm is based on the pressure balance on the magnetopause and in the
plasma sheet. Contrary to the model PR96 expression for RT as a function solar wind/IMF
parameters, it allows one to calculate the actual RT value and the tail magnetic flux using the
measured lobe magnetic field.
Till now we used the algorithm for magnetotail data tailward of -15 Re, where the tail
approximation is fulfilled. In the present study we generalize the method for the region inside
-15 Re, where the dipole field contribution is significant. To obtain the open F value the
dipole field is subtracted from the total magnetic field.
We test the algorithm on a CCMC global simulation, comparing the F values, calculated
by the algorithm, with the flux values obtained by direct integration through the magnetotil
cross-section at X= -15 Re. The analysis shows good results (cc >0.9, regression coefficients
about 0.8-0.9) for measurements in the tail lobes at X as close to the Earth as -7
Re.
We also compare the F values obtained by the modified algorithm based on Cluster
observations in the tail lobes with open magnetic flux Fo values based on global auroral
images from IMAGE spacecraft. Similarities and differences between F and Fo values are
discussed. |
|
|
|
|
|
|