On the polarimetric signature of emerging magnetic loops in the quiet-Sun

Abstract

The abundance of Stokes V profiles dominated by one lobe at the locations of emergence of Omega-shaped magnetic loops is evaluated. The emergence events were found in Hinode SOT/SP time-sequences of quiet-Sun regions. Such a study has the aim of confirming a prediction based on the basic geometrical and physical properties of emerging magnetic loops: Stokes V profiles dominated by one lobe are possibly the main polarimetric signature of these structures. In agreement with this prediction, 47 % of the Stokes V profiles analyzed has an unsigned amplitude asymmetry larger than 0.3, while in the quiet-Sun the abundance is of about 30 %. This excess with respect to the quiet-Sun is found consistently for whatever value of the threshold on the amplitude asymmetry. Such a result proves the goodness of the physical scenarios so far proposed for the interpretation of loop emergence events and may prompt the use of Stokes V profiles dominated by one lobe as a new proxy for their identification in observations with a good spectral sampling.

5 pages, 3 figures - Accepted for publication in ApJ Letters

References in corpus (6)

• Emergence of Small-Scale Magnetic Loops in the Quiet Sun Internetwork
• Emergence of small-scale magnetic loops through the quiet solar atmosphere
• Low-lying magnetic loops in the solar internetwork
• Magnetic field emergence in quiet Sun granules
• The frontier between Small-scale bipoles and Ephemeral Regions in the solar photosphere: Emergence and Decay of an Intermediate-scale bipole observed with IMaX/SUNRISE
• Magnetic field emergence in mesogranular-sized exploding granules observed with SUNRISE/IMaX data

Cited by in corpus (10)

• Solar magnetoconvection and small-scale dynamo: Recent developments in observation and simulation
• The Role of Partial Ionization Effects in the Chromosphere
• Solar surface and atmospheric dynamics: The Photosphere
• The relation between photospheric supergranular flows and magnetic flux emergence
• Magnetic topology of the north solar pole
• Orphan penumbrae: Submerging horizontal fields
• High speed magnetized flows in the quiet Sun
• Three-lobed near-infrared Stokes V profiles in the quiet Sun
• Evidence of quiet Sun chromospheric activity related to an emerging small-scale magnetic loop
• Analysis of Pseudo-Lyapunov Exponents of Solar Convection Using State-of-the-Art Observations