TSST H-alpha Full Disk Images

The Hα channel of the TSST is a Daystar SR-127 QT, an achromatic refractor with 127 mm aperture and a focal length of 2667 mm. The telescope features a narrow band filter with a passband of 0.04 nm centered at the Hα line. The filter is a temperature stabilized etalon in collimated configuration, and it is the same filter used in the GONG network for the Hα channel to monitor the chromospheric transients (Giersch, 2013). The Hα channel is equipped with a focal reducer, acting also as a field curvature corrector, to match the Dalsa Pantera 1M60 pixel scale of the MOF channel (2.6 arcsec/pixel). The main goal of this TSST channel is the real time detection of flaring region (Piazzesi et al., 2012, Pötzi et al., 2015, 2018) during the impulsive and flash phases when the intensity reaches its maximum (Benz, 2017). Hα images are extremely important for ground based SWe monitoring (see, e.g. Veronig & Potzi, 2016) and to automatically detect and track structures in the solar chromosphere, as filaments (Bernasconi et al., 2005, Fuller et al., 2005, Bonnin et al., 2013) and prominences (Wang et al., 2010), that can be associated with flare and coronal mass ejections.

References

Dataset summary

internal_name:	unitov_halpha_tsst_image
publisher:	University of Rome Tor Vergata
alph_code:	2
id_tmp:	59
short_name:	TSST-halpha
identifier:	aspis:///unitov/halpha_tsst_image
dynamic:	data collection grows in time. Bulk size estimated on 1 yr. Cadence: at least one image per day in clear weather conditions (up to 5/8 per day) one image every 5 s for some minutes (<60 minutes) during flares
size:	20GB
format:	.fits
type:	image
records_number:	9
time_start:	2022-09-01
time_stop:	2023-05-01
spatial:	SUN
messenger:	photons
spectral_min:	656.26
spectral_max:	656.34
spectral_units:	nm
observable:	{AR,flare}
latest update:	2024-03-28 05:08:17

Columns specification

progr	column	units	type	description
1	time	UTC	datetime	UTC - datetime - Acquisition time
2	Quality	0-1	float	Quality of the image 0-1 0=bad, 1=OK
3	X_cen	pixel	int	Position of the Solar centre on the X image axis [pixels]
4	Y_cen	pixel	int	Position of the Solar centre on the Y image axis [pixels]
5	R_sun	pixel	int	Radius of the Solar disk [pixels]
6	min	ADU	float	minimum value of the image [ADU]
7	Max	ADU	float	maximum value of the image [ADU]
8	mean	ADU	float	average value of the image [ADU]
9	std	ADU	float	standard deviation value of the image [ADU]
10	B0	deg	float	apparent tilt of the sun’s axis of rotation with respect to the ecliptic [degrees]
11	data_name	char	string	the name of the file with the data
12	prew_name	char	string	the name of the full preview file
13	thumb_name	char	string	the name of the thumbnail file