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| Paper: |
Requirements for the Analysis of Quiet-Sun Internetwork Magnetic Elements with EST and ATST |
| Volume: |
463, 2nd ATST-EAST Workshop in Solar Physics: Magnetic Fields from the Photosphere to the Corona |
| Page: |
57 |
| Authors: |
Orozco Suárez, D.; Bellot Rubio, L. R.; Katsukawa, Y. |
| Abstract: |
The quiet-Sun internetwork is permeated by weak and highly inclined
magnetic fields whose physical properties, dynamics, and magnetic
interactions are not fully understood. High spatial resolution
magnetograms show them as discrete magnetic elements that
appear/emerge and disappear/cancel continuously over the quiet Sun
surface. The 4-m European Solar Telescope (EST) and the Advanced
Technology Solar Telescope (ATST) will obtain two-dimensional, high
cadence, high precision polarimetric measurements at the diffraction
limit (30 km). Here, we compile the basic requirements for the
observation of internetwork fields with EST and ATST (field of view,
cadence, instrument configuration, etc.). More specifically, we
concentrate on the field-of-view requirements. To set them we analyze
the proper motion of internetwork magnetic elements across the solar
surface. We use 13 hours of magnetograms taken with the Hinode
satellite to identify and track thousands of internetwork magnetic
element in an isolated supergranular cell. We calculate the velocity
components of each element and the mean distance they travel. The
results show that, on average, magnetic elements in the interior of
supergranular cells move toward the network. The radial velocity is
observed to depend on the distance to the center of the supergranule.
Internetwork magnetic elements travel 4″ on average. These
results suggest that ATST and EST should cover, at least, one
supergranular cell to obtain a complete picture of the quiet Sun
internetwork. |
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