High cadence spectropolarimetry of moving magnetic features observed around a pore

Abstract

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$nmandtheCaII854.2$ 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.

Accepted by A&A

References in corpus (10)

• Emergence of small-scale magnetic loops through the quiet solar atmosphere
• Spectral Line Selection for HMI: A Comparison of Fe I 6173 and Ni I 6768
• MHD wave transmission in the Sun's atmosphere
• Detection of sea-serpent field lines in sunspot penumbrae
• Flow Field Evolution of a Decaying Sunspot
• Horizontal flow fields observed in Hinode G-band images II. Flow fields in the final stages of sunspot decay
• Spectropolarimetry of a decaying sunspot penumbra
• Moat flow in the vicinity of sunspots for various penumbral configurations
• The photospheric environment of a solar pore with light bridge
• Magnetic topology of a naked sunspot: Is it really naked?

Cited by in corpus (7)

• Multiwavelength studies of MHD waves in the solar chromosphere: An overview of recent results
• IBIS-A: The IBIS data Archive. High resolution observations of the solar photosphere and chromosphere with contextual data
• Moving Magnetic Features around a Pore
• JP3D compression of solar data-cubes: photospheric imaging and spectropolarimetry
• Does H$\alpha$ Stokes~$V$ profiles probe the chromospheric magnetic field? An observational perspective
• The Decay of Two Adjacent Sunspots Associated with Moving Magnetic Features
• Penumbral brightening events observed in AR NOAA 12546