High cadence spectropolarimetry of moving magnetic features observed around a pore

• Main Authors: Criscuoli, S, Del Moro, D, Giannattasio, F, Viticchié, B, Giorgi, F, Ermolli, I, Zuccarello, F, Berrilli, F
• Format: Journal Article
• Language: English
• Published: 09-08-2012
• Subjects: Physics - Solar and Stellar Astrophysics
• DOI: 10.48550/arxiv.1208.2039

Moving magnetic features (MMFs) are small-size magnetic elements that are
seen to stream out from sunspots, generally during their decay phase. Several
observational results presented in the literature suggest them to be closely
related to magnetic filaments that extend from the penumbra of the parent spot.
Nevertheless, few observations of MMFs streaming out from spots without
penumbra have been reported. The literature still lacks of analyses of the
physical properties of these features.
We investigate physical properties of monopolar MMFs observed around a small
pore that had developed penumbra in the days preceding our observations and
compare our results with those reported in the literature for features observed
around sunspots. We analyzed NOAA 11005 during its decay phase with data
acquired at the Dunn Solar Telescope in the FeI 617.3$ nm and the CaII 854.2$
nm spectral lines with IBIS, and in the G-band. The field of view showed
monopolar MMFs of both polarities streaming out from the leading negative
polarity pore of the observed active region. Combining different analyses of
the data, we investigated the temporal evolution of the relevant physical
quantities associated with the MMFs as well as the photospheric and
chromospheric signatures of these features.
We show that the characteristics of the investigated MMFs agree with those
reported in the literature for MMFs that stream out from spots with penumbrae.
Moreover, observations of at least two of the observed features suggest them to
be manifestations of emerging magnetic arches.