1/16/2024
Contact: Anna Malanushenko, anny@ucar.edu
These are CME Challenge v2.0: synthetic databases for PUNCH mission.
It consists of two different data products: (1) the 'challenge' data, and (2) the '4π' data.
CME Challenge data
Below is a set of four synthetic CMEs. These are Gamera simulations of different Gibson&Low spheromaks which emerged into different locations in the steady-state solar wind for the same WSA solution.
The ground truth (the input parameters and the full simulation volume) is known in all four cases, and the parameters are revealed
for CME0 ('reference case'). However, for CME1, CME2, and CME3, the input parameters are not revealed in this document. The reason
for that is to provide additional validation for your models: once calibrated on CME0 (known case), you can apply the same analysis
to other cases, and then request me to reveal the ground truth answers. If the analysis will be done blindly and compared to truth
post factum, this will be of a strong support for publishing the method. (And, if the answers do not compare to ground truth to your
satisfaction, there is no obligation to publish or disclose your effort.)
In all three cases, the data are:
— total and polarized brightness (tB and pB),
— the field of view is 90°, corresponding to that of PUNCH, but the resolution is coarser,
— the projection is azimuthal equidistant, corresponding to that of PUNCH,
— viewed by observers which are at 1AU, at b-angle of 0° (solar equator), and at the central meridian 0°/30°E/60°W/90°E
away from the CME (0° is a halo CME, and 90°E means that the CME is on the W limb);
— in FITS format with standard keywords (but you can also download an MPEG for a quick view).
The starting time of the event in FITS keywords is completely arbitrary. The WSA solutions we used is for CR2095,
but the starting time is specified for another solar rotation, the closest one in time with b-angle=0°. This is done to
facilitate tomographic reconstructions, as the observer's b-angle is 0°.
Supplemental data (not published here, but available upon request) includes:
— MHD variables vs time on 1AU shell, useful for in situ techniques.
— MHD variables vs time on a Sun-to-observer line, for several lines around the CME.
CME0
(reference case)
| Starting latitude: | 0° |
| Velocity | simulation parameter: 1700.0 km/s;
as measured from 3D density data:
time profile: front point, center of mass |
| Trajectory and mass | as measured from 3D density data:
table |
| Angular size | simulation parameter: 45° |
| Shape | as measured from 3D density data:
full envelope viewed N pole, face-on view, and side-on view: figure
|
| Chirality | simulation parameter: +1; |
| [other properties here, determined by your analysis] | [let me know what is useful to compute] |
Download
|
|
CME1
(properties hidden to facilitate blind analysis; disclosed upon request)
| Starting latitude: | 0° |
| Velocity | — |
| Trajectory and mass | — |
| Angular size | — |
| Shape | — |
| Chirality | — |
| [other properties here, determined by your analysis] | — |
Download
|
|
CME2
(properties hidden to facilitate blind analysis; disclosed upon request)
| Starting latitude: | 0° |
| Velocity | — |
| Trajectory and mass | — |
| Angular size | — |
| Shape | — |
| Chirality | — |
| [other properties here, determined by your analysis] | — |
Download
|
|
CME3
(properties hidden to facilitate blind analysis; disclosed upon request)
| Starting latitude: | 0° |
| Velocity | — |
| Trajectory and mass | — |
| Angular size | — |
| Shape | — |
| Chirality | — |
| [other properties here, determined by your analysis] | — |
Download
|
|
4π data
These are different views onto CME0. The observer can be in various positions on the 1AU sphere.
— Assuming longitude=0° is for a halo CME, the observer's longitude varies between 0° and 340°, with
the increment of 20°.
— Assuming latitude=0° for solar equator, the observer's latitude varies between 0° and 180°, with the
increment of 10°.
— The data are available for both tB and pB, in PUNCH's field of view (45°).
— The data are available in both FITS and PNG (preview) formats.
— For each position on the 1AU sphere, time sequence for the entire CME0 passage is available.
