TUS (Tracking Ultraviolet Setup)
METEOR mode operation

Reported by Kenji Shinozaki
National Centre for Nuclear Research, Łódź, Poland
2nd DIMS Workshop 2020-12-05

Outline
TUS (Tracking Ultraviolet Setup), the first orbital fluorescence detector for
ultra-high energy cosmic ray air shower detections is a JEM-EUSO (JointExperiment Missions for Extreme Universe Space Observatory) family project
promoted by Moscow State University group from development to operationand data analysis . University of Turin group joined the data analysis effort.

● TUS (Tracking Ultraviolet Setup) detector and operation● Meteor mode operation and analysis by TUS○ Meteor event○ In-progress work for nuclearite search by TUS● SummaryTUS on Lomonosov satellitePrimary mirror

B.A. Khrenov et al JCAP03(2020)033

Camera on focus

256 times steps for 256 PMTs

1 PMT ~5 km resolution from 500 km

Sensitive wavelength bandOperation overview● Launch:● Orbit:●●●●2016-04-28
97.8° inclination at ~500 km (P=94 min)(sun-synchronous)First light (switch-on): 2016-05-19
Regular operation start: 2016-08-16
End of operation:
2017-11-30 (last data)
Operation modes○ EAS mode:time res.
0.8 μs for duration of ~205 μs○ TLE “dust” mode: time res.
25.6 μs for duration of 6.6 ms○ TLE mode:time res.
0.4 ms for duration of ~0.1s○ METEOR mode: time res. 6.6 ms for duration of 1.68 s

METEOR mode data
● Three campaigns delegated to METEOR mode performed○ 2016-12 -- 2017-01○ 2017-02 -- 2017-03○ 2017-11● Statistics○ ~35,000 events in METEOR mode
○ ~9500 events in “Dark conditions” according to HV status■ Can be used for generic analysis for meteors (~5 day obs. time)○ ~1700 events under no moon effect (zenith angle < 90°)
■ Mainly used for nuclearite search (~2 day obs. time)
Observation time is preliminary

Example of METEOR mode event (170103)

METEOR mode event (170103)

METEOR mode event (170318b)

List of Meteors
measured
by TUS
List of meteors
detected
by TUSEvent
TUS161230
TUS161231
TUS170103
TUS170105
TUS170106
TUS170318a
TUS170318b
TUS170318c
TUS170319
TUS170321
TUS171110
TUS171111a
TUS171111b

Time (UTC)
19:44:46
05:06:54
14:31:08
16:54:56
18:09:26
01:27:04
10:56:39
15:54:32
20:11:56
01:35:37
05:40:44
02:22:15
11:47:16

Latitude
9.38° S
2.08° N53.77° N
16.84° N
11.66° S
31.31° N
14.14° N
44.29° S
52.37° S
45.51° N
66.45° N
0.17° N
0.22° SLongitude
49.34° E
89.72° W
138.88° E
95.15° E
72.82° E
31.26 W
176.25° W
100.34° E
33.62° E
30.43° W
84.6° W
51.8° W
166.89° E

Location
North of Madagascar (Middle of the sea)
Northeast of Galapagos Islands (Middle of the sea)
Krai de Jabárovsk (Rusia, near zaliv Nikolaya)
Irawadi (Birmania)
Indian Ocean (Middle of the sea)

Preliminary

Names of TUS events correspond to their registration date.
For those events recorded on the same day, suffixes a, b, c are used.

North Atlantic Ocean (Middle of the sea)
North Pacific Ocean (Middle of the sea)
Indian Ocean (Middle of the sea)
South Atlantic Ocean (Middle of the sea)
North Atlantic Ocean (Middle of the sea)West of Cuenca Foxe (Canada)
Northwest of Amazonas River (Brazil)
North of Nauru (Middle of the sea)

# hit pixels
651371632932
1260
13262512

List of meteor measured by TUS

Preliminary✔
✔
✔

A few comments linking nuclearite search (Turin)

Simulated nuclearite

Fast meteor

Projected speed analysis
Mass scale need revisionProjected speed analysis
Mass scale need revision

Analysis applied to real data (Quadrantis event)
Projected seed at ~100 km
height” ~40 km/s
(preliminary)TUS
7.68km/s●●

This example: very consistent with characteristics of Quadrantis in terms of traverse speed
and directionality to the radiant (RA: ~15.5h Decl: +50°)
Every selected METEOR data, the first 32 ticks are used to determine the average andfluctuation of background baseline for every PMT

Recent improvement for METEOR mode analysis
New inflight gain calibration scheme

General METEOR mode analysis

The linear approximation σ2(А) for pixel 126

Paper is to be published in 2021

✔ Track reconstruction algorithms✔ Light curves analyses✔ Simultaneous ground-based
measurements?

Summary● TUS observed more than a dozen of meteors in its limited
METEOR mode campaigns among other science objectives● Registered events are reasonably explained to be moving
events consistent with meteors by measuring the light curveand angular speed from the orbit○ This capability is essential for nuclearite search● Recent improvement on the meteor analysis and inflightcalibration also allows further investigation for meteor study
and nuclearite search from the orbit