Particle Zoo
We regurally take frame mode data to maintain the database of
RDD map. We visually check all the frame data to reject those
heavily contaminated by the particle events. However, some of
the frame data contain very peculiar tracks of charged particle,
which are shown below. Just enjoy the images.
Long Track
When the charged particle went through in the ccd chip almost
parallel to the surface, it produces a long track.
Image 1
Most of the track may go through the substrate almost parallel to the
CCD surface. Left-most part of the track mat be in the depletion region.
| Date |
1996/3/15 22:14:00 |
| Chip & Mode |
s0c2 4-ccd mode |
Image 2
This particle seems to have created so many electron-hole pairs that the
image of the tracks are largely saturated.
| Date |
1997/4/10 3:16:55 |
| Chip & Mode |
s0c0 4-ccd mode |
Image 3
A charged particle went through the chip in the frame store region
during the frame transfer. Thin horizontal event near the end
of the track may have been produced by the same particle.
| Date |
1998/6/6 14:36:05 |
| Chip & Mode |
s1c2 2-ccd mode |
Shower
Energetic particles sometimes produce the shower in the satellite.
If the shower is generated in the SIS, it produces a characteristic
pattern in the frame mode image.
Image 1
Partcle shower went through the chip from the backside to the
foreside.
| Date |
1998/6/17 23:01:06 |
| Chip & Mode |
s1c3 1-ccd mode |
Image 2
A shwoer went through the chip normal to its surface.
| Date |
1998/5/14 5:03:36 |
| Chip & Mode |
s1c2 2-ccd mode |
South Atlantic Anormaly
Following frame mode data were obtained when the satellite was
in the South Atlantic Anormaly (SAA).
Bias voltage to the CCD is usually turned off in the SAA when the
RBM rate exceeds the threshold level.
These data were obtained before the trun-off of the bias voltage
just after the entry to SAA.
Image 1
| Date |
1996/6/27 0:18:49 |
| Chip & Mode |
s0c1 1-ccd mode |
| Lon. & Lat. |
288.9969, -14.8821 |
| Geomagnetic angle* |
107.2 deg |
*Angle to the satellite's Z-axis.
Image 2
| Date |
1997/2/27 1:19:06 |
| Chip & Mode |
s1c3 1-ccd mode |
| Lon. & Lat. |
286.8200, -22.5337 |
| Geomagnetic angle |
155.4 deg |
Image 3
| Date |
1997/3/6 4:10:40 |
| Chip & Mode |
s0c1 2-ccd mode |
| Lon. & Lat. |
280.5443, -23.9571 |
| Geomagnetic angle |
123.6 deg |
2000/6/23 T. Dotani
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