Coordinated observations between China and Europe to follow active region 12709

TL;DR

This paper reports on a coordinated multi-observatory campaign to image and analyze active region NOAA 12709, demonstrating the potential of international collaboration for solar observations and preliminary velocity measurements.

Contribution

It presents the first coordinated multi-site observations of a solar active region using different instruments and wavelengths, showcasing the feasibility and benefits of joint international solar campaigns.

Findings

First multi-site images of active region NOAA 12709 from China and Europe.

Preliminary Doppler LOS velocity measurements from combined data.

Discussion on the potential of coordinated observations for solar physics.

Abstract

We present the first images of a coordinated campaign to follow active region NOAA 12709 on 2018 May 13 as part of a joint effort between three observatories (China-Europe). The active region was close to disk center and enclosed a small pore, a tight polarity inversion line and a filament in the chromosphere. The active region was observed with the 1.5-meter GREGOR solar telescope on Tenerife (Spain) with spectropolarimetry using GRIS in the He I 10830 \r{A} spectral range and with HiFI using two broad-band filter channels. In addition, the Lomnicky Stit Observatory (LSO, Slovakia) recorded the same active region with the new Solar Chromospheric Detector (SCD) in spectroscopic mode at H$\alpha$ 6562 \r{A}. The third ground-based telescope was located at the Fuxian Solar Observatory (China), where the active region was observed with the 1-meter New Vacuum Solar Telescope (NVST), using the Multi-Channel High Resolution Imaging System at H$\alpha$ 6562 \r{A}. Overlapping images of the active region from all three telescopes will be shown as well as preliminary Doppler line-of-sight (LOS) velocities. The potential of such observations are discussed.