 |
| Titel |
Observations of small-scale magnetic fields in solar flares |
| VerfasserIn |
Vsevolod Lozitsky, Mykola Gordovskyy |
| Konferenz |
EGU General Assembly 2011
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 13 (2011) |
| Datensatznummer |
250049543
|
|
|
|
|
|
| Zusammenfassung |
| It is believed that the photospheric magnetic fields have a fine structure with a characteristic
scale of ~100km. This fine structure cannot be directly observed but can be studied by
comparing magnetic field measured using spectral lines with similar formation depths but
different Lande factors (i.e. different magnetic sensitivity).
In the present work the magnetic field structure in the flaring photosphere is studied using
the I±V Stokes profiles of the FeI 5247.1Å, CrI 5247.7Å, FeI 5250.2Åand FeI
5250.6Ålines. It is shown that the picture of Zeeman splitting in flares is substantially
different from those observed in sunspots. Namely, the splitting Δλ measured as function of
distance from the line centre λc in flares is very non-uniform and has several maximums. It
has been concluded, that the observed line profiles may be explained by the model of
magnetic field with two-component structure. The best fit for the observational
data is provided by the model with weak ambient field penetrated by small-scale
flux tubes with strong ~ 4 - 7kG magnetic field and with almost zero turbulent
velocities. |
|
|
|
|
|
|