2015/12/18

239 GHzScience Highlights—Solar Physics with ALMA —Masumi Shimojo
26 December 2017

Chile Observatory/NAOJ/NINS

ALMA/45m/ASTE Users Meeting 2017@Mitaka Campus, NAOJ
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Activities related withALMA solar observations in this year✤

2017/1/18: Released the solar SV data (2011.0.00020.SV)✤✤✤

Array configuration : Equivalent to C36-1 + 7m array, but thenumber of the antennas is ~30 (included 7m-antennas).

✤Only Band3 and Band6 are enabled for solar observations in Cycle4,5, and 6.

2017/3-4 : 2nd Solar Campaign for the Cycle 4 PI’s observations.
✤✤Sunspot, QS, limb, filaments, prominence, and full-sun (TP)

1st part was carried out in Dec. 2017, but most of the observations are
failed by the coordinate problem.

2017/7 : Started providing solar data to PIs.
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Examples of the solar SV data

Band6 Full Sun image(Obtained with the TP array)

Band6 Sunspot image [149pt-Mosaic](Obtained with the 12m+7m and TP array)
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The reference papers of solar ALMAobservations with Band3 and Band6✤

Shimojo, M., Bastian, T.S., Hales, A.S., et al.
Solar Physics, (2017) vol. 292, id 87“Observing the Sun with the Atacama Large Millimeter/submillimeter
Array (ALMA): High-Resolution Interferometric Imaging”✤✤

The paper is selected as one of the five free-access papers for celebrating the 50th
anniversary of “Solar Physics” Journal.

White, S.M., Iwai, K., Phillips, N.M. et al.
Solar Physics, (2017) vol. 292, id 88“Observing the Sun with the Atacama Large Millimeter/submillimeter
Array (ALMA): Fast-Scan Single-Dish Mapping”
4Refereed papers based on solar SV data
Order: The date of the publication✤Shimojo et al. 2017, ApJL, vol. 841, id. L5✤Iwai et al. 2017, ApJL, vol. 841, id. L20✤Bastian et al. 2017, ApJL, vol. 845, id. L19✤

Alissandrakis et al. 2017, A&A, vol. 605, id. A78✤

Louktcheva et al. 2017, ApJ, vol. 850, id. 35

Color code: Flare, Sunspot, Full-Sun
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ALMA Discovery of Solar Umbral Brightness
Enhancement at λ = 3 mm Iwai et al. 2017, ApJL, 841, L20

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Solar ALMA Observations: Constraining theChromosphere above Sunspots
Loukitchava et al. 2017, ApJ, 850, 35

Severino’s model is most actual one?
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The First ALMA Observation of a Solar
Plasmoid Ejection from an X-Ray Bright Point
Shimojo et al. 2017, ApJL, 841, L5

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Center-to-limb observations of the Sun withALMA: Implications for solar atmospheric models
Alissandrakis et al. 2017, A&A, 605, A78

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Summary✤Solar physics with ALMA started in this year!

✤From SV data that are obtained with the most compact array constructed fromonly 30 antennas, five refereed paper were already published in this year (Theother one is accepted by A&A).

✤2-seconds time cadence of the images is very useful for investigating the active
phenomena in the solar atmosphere (but solar physicists want higher cadence forcatching signals from non-thermal electrons).

✤mm/sub-mm is still the unknown spectrum region for solar physic. Papers are
published from only the single-dish data.

✤Because Cycle 4 data were provided to PI since July, there is no publication fromCycle 4 projects yet. The solar results from Cycle 4 will appear in next year (soon).
10www.almaobservatory.org
The Atacama Large Millimeter/submillimeter Array (ALMA), an international astronomy facility, is a partnershipamong Europe, North America and East Asia in cooperation with the Republic of Chile. ALMA is funded in Europeby the European Organization for Astronomical Research in the Southern Hemisphere (ESO), in North America by
the U.S. National Science Foundation (NSF) in cooperation with the National Research Council of Canada (NRC)
and the National Science Council of Taiwan (NSC) and in Japan by the National Institutes of Natural Sciences(NINS) in cooperation with the Academia Sinica (AS) in Taiwan and the Korea Astronomy and Space Science
Institute (KASI). ALMA construction and operations are led on behalf of Europe by ESO, on behalf of North America
by the National Radio Astronomy Observatory (NRAO), which is managed by Associated Universities, Inc. (AUI) andon behalf of East Asia by the National Astronomical Observatory of Japan (NAOJ). The Joint ALMA Observatory(JAO) provides the unified leadership and management of the construction, commissioning and operation of ALMA.

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A First Comparison of Millimeter Continuum and Mg ii
Ultraviolet Line Emission from the Solar Chromosphere
Bastian, et al. 2017, ApJL, 845, L1912