SEP-C25-0003
April 17, 2021
Science case
Widespread event
Widespread event
Flare date/time [UTC]
2021-04-17 16:04:20
2021-04-17 16:04:20
Flare class (GOES)
C5.0
C5.0
Flare Carrington latitude
-17°
-17°
Flare Carrington longitude
203°
203°
Flare comments
Flare is behind the limb as seen from Earth, flare location determined using SOLO/STIX
Flare is behind the limb as seen from Earth, flare location determined using SOLO/STIX
Radio type II bursts
SOLO, PSP, STEREO-A, Wind, GB
SOLO, PSP, STEREO-A, Wind, GB
Decametric type II burst
Start time [UT]
16:20
End time [UT]
17:10
Frequency range
20-6 MHz
Metric type II burst
Start time [UT]
16:26
End time [UT]
16:35
Frequency range
25-49 MHz
Imaging available
No
Radio comments
RSTN
RSTN
| BepiColombo | L1 (SOHO/Wind) | Parker Solar Probe | STEREO A | Solar Orbiter | |
|---|---|---|---|---|---|
| Radial distance [au] | 0.63 | 0.99 | 0.42 | 0.97 | 0.84 |
| Carrington latitude [deg] | 0 | -5 | 4 | -7 | 0 |
| Carrington longitude [deg] | 180 | 314 | 104 | 261 | 216 |
| e- (~1 MeV) / p (25-40 MeV) ratio | 6.79e+01 |
—
|
3.38e+03 |
—
|
4.04e+02 |
| p 25 MeV | |||||
| Onset date [UTC] | 2021-04-17 |
—
|
2021-04-17 | 2021-04-17 | 2021-04-17 |
| Onset time [UTC] | 16:58:30 |
—
|
16:58:30 | ~16:00:00 | <=17:35:00 |
| Averaging used for onset [min] | 1 |
—
|
3 | 60 | 20 |
| Sector used for onset | 1 |
—
|
A |
—
|
sun |
| Peak date [UTC] | 2021-04-17 | 2021-04-18 | 2021-04-17 | 2021-04-18 | 2021-04-17 |
| Peak time [UTC] | 19:15:00 | 19:30:00 | 17:35:00 | 13:30:00 | 19:10:00 |
| Peak flux [cm-2s-1sr-1MeV-1] | 4.74e-01 | 2.06e-04 | 7.89e-02 | 4.71e-04 | 3.29e-03 |
| Averaging used for peak [min] | 10 | 60 | 10 | 60 | 20 |
| Sector used for peak | 2 |
—
|
A |
—
|
sun |
| Inferred injection date [UTC] | 2021-04-17 |
—
|
2021-04-17 | 2021-04-17 | 2021-04-17 |
| Inferred injection time [UTC] | 16:38:00 |
—
|
16:44:00 | 15:24:00 | 17:04:00 |
| Spiral length used for inferred injection time [au] | 0.67 |
—
|
0.43 | 1.12 | 0.96 |
| Solar wind speed [km/s] |
—
|
—
|
333 | 383 | 371 |
| Comments | Too small event to determine onset. Only very small and gradual increase | Event too small to determine onset | Gradual and small event | ||
| e- 100 keV | |||||
| Onset date [UTC] | 2021-04-17 |
—
|
2021-04-17 | 2021-04-17 | 2021-04-17 |
| Onset time [UTC] | 16:30:30 |
—
|
16:39:00 | <=18:30:00 | 17:13:30 |
| Averaging used for onset [min] | 1 |
—
|
2 | 60 | 3 |
| Sector used for onset | 2 |
—
|
3 (sun) | south | sun |
| Peak date [UTC] | 2021-04-17 |
—
|
2021-04-17 | 2021-04-17 | 2021-04-18 |
| Peak time [UTC] | 18:45:00 |
—
|
17:15:00 | 22:30:30 | 01:25:00 |
| Peak flux [cm-2s-1sr-1MeV-1] | 1.61e+04 |
—
|
3.10e+03 | 1.01e+02 | 3.46e+02 |
| Averaging used for peak [min] | 10 |
—
|
10 | 60 | 10 |
| Sector used for peak | 1 |
—
|
7 (asun) | south | south |
| Inferred injection date [UTC] | 2021-04-17 |
—
|
2021-04-17 | 2021-04-17 | 2021-04-17 |
| Inferred injection time [UTC] | 16:21:00 |
—
|
16:33:00 | 18:13:00 | 16:59:00 |
| Spiral length used for inferred injection time [au] | 0.67 |
—
|
0.43 | 1.13 | 0.96 |
| Solar wind speed [km/s] |
—
|
—
|
341 | 381 | 369 |
| Comments | No event, period of increased background and potential ion contamination | ||||
| e- 1 MeV | |||||
| Onset date [UTC] | 2021-04-17 |
—
|
2021-04-17 |
—
|
2021-04-17 |
| Onset time [UTC] | <=16:50:00 |
—
|
16:10:00 |
—
|
<=17:30:00 |
| Averaging used for onset [min] | 4 |
—
|
20 |
—
|
20 |
| Sector used for onset | 2 |
—
|
A |
—
|
sun |
| Peak date [UTC] | 2021-04-17 |
—
|
2021-04-17 | 2021-04-18 | 2021-04-17 |
| Peak time [UTC] | 18:35:00 |
—
|
17:30:00 | 01:30:00 | 22:50:00 |
| Peak flux [cm-2s-1sr-1MeV-1] | 7.76e+00 | 9.03e-03 | 2.66e+02 | 2.44e-02 | 2.05e-01 |
| Averaging used for peak [min] | 10 | 10 | 20 | 180 | 20 |
| Sector used for peak | 2 |
—
|
B |
—
|
sun |
| Inferred injection date [UTC] | 2021-04-17 |
—
|
2021-04-17 |
—
|
2021-04-17 |
| Inferred injection time [UTC] | 16:44:00 |
—
|
16:06:00 |
—
|
17:22:00 |
| Spiral length used for inferred injection time [au] | 0.67 |
—
|
0.43 |
—
|
0.96 |
| Solar wind speed [km/s] |
—
|
—
|
328 |
—
|
372 |
| Comments | No event | Event too small to determine onset | Gradual and isotropic event. Onset could be as early as 17:00 | ||