Speaker
Elena Benevolenskaya
(Pulkovo Astronomical Observatory, Saint Petersburg)
Description
In this presentation I discuss the results of the detailed evolution of the solar
active regions: NOAA 11101 during 10 days from 26 August 2010 to 4 September 2010 and
NOAA 11106 from 12 September 2010 to 20 September 2010 using magnetic data of the
line-of-sight component of the magnetic field and intensitygrams in continuum with
720 sec cadence. This period permits us to investigate insulated sunspots because of
it is a beginning of the solar cycle 24. We have obtained areas, the positive,
negative, signed and total fluxes for umbra and penumbra. It is found that the
positive magnetic flux appears inside the ‘negative’ umbra near the solar limb due to
the projection effect. Wavelet analysis of the sunspot rotation shows strong
periodicities about 2 hours near the east limb. And this result is a subject of the
discussion, also.
Primary author
Elena Benevolenskaya
(Pulkovo Astronomical Observatory, Saint Petersburg)
