The cube
The files packaged together as an Ersatz-Obsi cube have the following conventions and naming standards.
– the „average” file shows the curvature of the spectral line,
– „line zero”, marked with lime color. This line is the darkest spectral line in the recording, and is used as a guide line
– from this line of reference, pixel shifts are taken
– shorter wavelengths are towards the top, negative pixel shifts from „line zero”
– negative pixel shifts in the filename are marked with M(inus)
– longer wavelength are towards the bottom, positive pixel shifts from „line zero”
– positive pixel shifts in the filename are marked with (P)lus
– a counter (C)ounter makes the order of the files unambiguous
Example: 20250830_rot_rawLum_img_C007_M158.fits
datetime, rotated equatorially, raw (some calibration, like banding reduction, no stretching), files counter 7, -158px offset from „line zero”
Campaign „4376”
In this campaign, „line zero” is Fe I 4383.55Å, named with P000, thus the line of interest, 4375.9Å is at around M121. All cubes were recorded with the same refractor, 43/400 (stepped down from 62/400) and stock Sol’Ex, for the blue wavelengths, a blue bandpass filter was used as a full aperture energy rejection filter.
| date | λ1 [Å] | λ2 [Å] | notes |
| 2025-08-15 | 4375.9 cubes | — | |
| 2025-08-27 | 4375.9 cubes | — | |
| 2025-08-28 | 4375.9 cubes | 6302 | |
| 2025-08-29 | 4375.9 cubes | 6302 | |
| 2025-08-30 | 4375.9 cubes | 6302 |
An X flare in Hydrogen Beta
From 2025-11-14-0723 till 2025-11-14-0902, there is 500GiB of recordings of the X4 flare, in H beta. Some of the data is here.
G-band flare-prom
2025-10-09-1046 UT, five frames from a single scan (well under one second of scanning time) added together, and at the proms, an eventless region got subtracted to better show the signal
Flaring(?) bright prom, observed in G-band on 2025-10-09, at 10:46 UT for example.
Cube and time series of processing, something along the function of log(„line zero”) – log(„continuum”) included.
2025-08-11
0801-0843
Ha
small flare at 3 o’clock edge
2025-10-26 (TODO could be a typo, 2024, need to check)
0723-0928
He I D3
X-flare on disk
2025-10-09
0829-1103
G-band
bright prom
2025-03-28
(third party source)
Ha flaring prom, cube(s) are here
2025-06-16
0856-0939 Na I D2, He I D3
1027-1052 Mg triplet
bright flare on disk with big doppler in helium
Mg I b and Fe II showing dopplered prominence
2025-06-17
0745-0815
Mg triplet
obvious prominence in Mg I and Fe II, with doppler,
doppler of Fe II may differ from Mg I, at around 08:02-08:08
2025-06-29
0935-1101
Ha
large high floating prom at 1 o’clock
2025-08-04
1047-1058
at around Balmer break
bright prom lighting up the Hydrogen series at 10:51, with doppler, cloudy sky
2025-11-11
1006-1034, G-band
1037-1123, Ha
0829-1001, Na I D2 and He I D3,
X flare,
large doppler and bright flare,
broad stripes in the spectrum,
some frames over-exposed
cube(s) is/are here
2025-07-06
0800-0807
Mg I b and Fe II
bright prominence
2025-11-14
0723-0902
H beta
X4 flare on the disk
2025-11-07
0903-1236
Na I and He I D3
some flaring
2025-11-09
0730-1255
Na I D2 and He I D3
bright flaring on the disk, doppler, passing clouds, bright and dark helium features
cube(s) is/are here
2026-01-17
Multiple time series in He I 10830 and Ca II K.
Two events: an arching prominence and its doppler in He I 10830.
A bright M-class flare at around ~~1030Z, its start in Ca II K with both dark and bright doppler phenomena,
and (after switching over) its aftermath and considerable doppler in He I 10830 with dark helium clouds.
2026-01-25
~0705-1214 (with gaps, clouds, some intermezzo with Ca II 8542)
Focus: O I 7772, the oxygen triplet and the iron guide line at lambda 7781
There was a flare, tracked in oxygen after it lit up. Cube(s) are here.
2026-02-03
~0749
Focus on O I 7772 (and the triplet), there was a strong flare showing a strong darkening and strong doppler shift in the oxygen triplet.
Some clouds crossed the disk from time to time. The data cube(s) is/are here.
2026-03-18
~0904 the falling edge of a flare was caught in the oxygen triplet. The data cube(s) is/are here.
2026-04-24
~0828UT, big, X-flare on the western limb. Foreign data, processed into a „standard cube”. 2026-04-24
2026-06-02
Observations in oxygen, O I 7772 with two dark features that could be smudges, but are not the best examples, considering last months’ data.
2026-06-03
Observations in oxygen, O I 7772 with high M and X0 flares at ~UT 07:00, coobserved, and at ~11:28.
No smudge observed during this day.
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