Global High Resolution H-alpha Network

Instruments

BBSO | KSO | CAO | Meudon | USET | Pic du Midi | YNAO | HSOS

BIG BEAR SOLAR OBSERVATORY

BBSO's telescopes are specially designed for solar observations. A 1.6 m clear aperture telescope (NST) has been installed and the first light has been attained at the Nasmyth focus. A 10 cm Singer telescope in Ash Dome monitors the whole Sun in H-alpha.
 
Telescope Aperture: 10 cm
Filter Bandpass: 0.025 nm
Tunable Filter Range: +/- 0.30 nm
Detector: Kodak KAI 4021
Detector Size: 2048 x 2048 pixel
Dynamic Range: 12 bit

KANZELHÖHE SOLAR OBSERVATORY

At KSO the H-alpha observations are obtained with one of the three refractors of the monitoring instrument.
 
Telescope Aperture: 10 cm
Filter Bandpass: 0.07 nm
Tunable Filter Range: +/- 0.30 nm
Detector: Pulnix TM4200GE CCD Camera
Detector Size: 2048 x 2048 pixel
Dynamic Range: 12 bit

CATANIA ASTROPHYSICAL OBSERVATORY

At OACt the H-alpha observations are performed with a 15 cm refractor (focal length 230 cm) mounted on an equatorial spar.
 
Telescope Aperture: 15 cm
Filter Bandpass: 0.025 nm / 0.05 nm
Tunable Filter Range: +/- 0.1 nm
Detector: Astromed TE4 CCD Camera
Detector Size: 1360 x 1200 pixel
Dynamic Range: 16 bit

OBSERVATOIRE DE PARIS, SECTION DE MEUDON

The Meudon spectroheliograph is dedicated to full disk solar observations. It sonsists of *) a coelostat (two flat mirrors of 45 cm); *) a horizontal refractor (25 cm aperture) and *) a spectrograph. The full sun is scanned across the slit of the spectrograph during about 1 mn. The profile of the H alpha spectral line are recorded with a spectral resolution of 0.025 nm and the core intensity is used to provide monochromatic images. We also provide a "prominence" image. For that purpose we use a longer exposure time, so that prominences appear more clearly on the solar limb. In order to avoid overexposure of the solar disk, we put in front of it an artificial moon which consists of a circular neutral density glass (ND 0.8). Other data products: CaII K full disk images
 
Telescope Aperture: 25 cm Meudon Coelostat
Tunable Filter Range: N/A
Spectral Resolution: 0.025 nm
Tunable Filter Range: N/A
Detector: Princeton Instruments back illuminated spectroscopic CCD
Detector Size: 1340 x 100 pixel (image size 1500 x 1340 pixel)
Dynamic Range: 14 bit

Uccle Solar Equatorial Table

The H-alpha patrol telescope is operated in 3 different modes: manual image capture, automatic synoptic images (cadence: ~15 min) and flare patrol (cadence: ~20 s). The seeing degradation is compensated by real-time image selection applied to fast image sequences (4 im./s). On average, the telescope delivers at least one daily synoptic image over 260 days per year. Next to the H-alpha telescope, the USET also carries a white-light CCD imager and a visual telescope (sunspot drawings). A CaII-K CCD imaging system is in preparation.
 
Telescope Aperture: 8.0 cm
Filter Bandpass: 0.05 nm
Tunable Filter Range: N/A (NB: tunable “passively?by temperature control +/-0.25 nm)
Time Resolution: up to 250 ms
Detector: QImaging Retiga 4000R (Peltier cooled: Tamb-10°C, Max. image rate: 4 im./s)
Detector Size: 2048 x 2048 pixel
Dynamic Range: 12 bit
Data available from 2003 to present

OBSERVATOIRE MIDI/PYRÉNÉES

At Pic du Midi Observatory, the H-alpha observations of the full disk and the limb are obtained by the new solar instrument, CLIMSO. CLIMSO is a set of two 20 cm. coronagraphs (focal length 245 cm) and two 9 cm. refractors (focal length: 230 cm). CLIMSO is used in a daily survey mode since 2007, may. CLIMSO is operated by the "Observateurs Associés" team.
 
Telescope Aperture: 9 cm CLIMSO
Spectral Resolution: <0.05 nm
Tunable Filter Range: +/-0.1 nm
Detector: Apogee U4000 Kodak KAI-4021M CCD Camera
Detector Size: 2048x2048 pixels
Dynamic Range: 16 bit

YUNNAN ASTRONOMICAL OBSERVATORY

The synoptic observations at YNAO are carried out in a solar tower which hosts a twin telescope. Both telescopes have 18 cm aperture and one of them is the full disk H-alpha telescope.
 
Telescope Aperture: 18 cm
Filter Bandpass: 0.05 nm
Tunable Filter Range: +/- 0.06 nm
Detector: Kodak Megaplus CCD Camera
Detector Size: 2K x 2K pixel
Dynamic Range: 8 bit

HUAIROU SOLAR OBSERVING STATION

Synoptic observations at HSO include: vector magnetic field and line-of-sight velocity field measurements both in the photosphere and chromosphere; full disk H-alpha observations. The typical cadence for the full disk H-alpha observations is one image every 10 min. However, the cadence can be increased up tp oner image every 3 seconds.
 
Telescope Aperture: 14 cm
Filter Bandpass: 0.05 nm
Tunable Filter Range: +/- 3.2 nm
Detector: Kodak Megaplus 4.2i CCD Camera
Detector Size: 2K x 2K pixel
Dynamic Range: 8 bit