Application for Total Solar Eclipseof 2009 and VLBI
Masafumi OE
National Astronomical Observatoryof Japan
2009/02/24

APPLICATION for ECLIPSE and VLBI

1Our applications• Total solar eclipse– Live from IWO-Jima via WINDS.

• VLBI– WINDS enables to improve an accuracy of VLBIobservation.

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APPLICATION for ECLIPSE and VLBI

2APPLICATION FOR TOTAL SOLAR ECLIPSE

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APPLICATION for ECLIPSE and VLBI

3Overview• On 2009 Jul. 22, a total solar eclipse is able to be seen.
– The maximum duration of totality reaches over 6 min.
• The goal of this project is that many citizens can sharethe intellectual excitement to natural science.
– This is an valuable opportunity for people to improvementin scientific literacy.
– As a result of discussing the weather condition andenvironment, this project selected “IWO-Jima(硫黄島)”.
– The high definition video stream of the total solar eclipse istransmitted from IWO-Jima.
– The solar eclipse contents are disclosed without cost.
• This project provide the stream for you with Open Content.
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APPLICATION for ECLIPSE and VLBI4

Total Solar Eclipse around IWO-Jima
父島列島
母島列島

北硫黄島

硫黄島(IWO-Jima)

11:27 JST5min© Jay Anderson
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APPLICATION for ECLIPSE and VLBI

5

Weather Fact
129°Tokara
141°IWO-Jima

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APPLICATION for ECLIPSE and VLBI

6

Weather Fact
• In the past ten years, IWO-Jima have a smaller
risk of typhoon.
The number in the path of the typhoon
July

August

1-10

11-20

20-31

1-10

11-20

IWO-Jima

01141Tokara

12860

TOKARA
AMAMI

Source JAXA typhoon path data base
IWO-Jima

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APPLICATION for ECLIPSE and VLBI7

About IWO-Jima• IWO-Jima is mainly administrated by Japan Ministry of defense(MOD).
– No permanent civilian population / Off limits to civilians.
– Our project is permitted by MOD.

• No optical fiber has been landed.
– Good location for WINDSTokyoOkinawa

IWO-JimaLocation: 24°47’N 141°19’E﻿
Square : about 22 km²
Climatic zone: the subtropics, the averagetemperature in air is 23.6°C

GuamSource IWO-Jima guide by Japan Maritime Self-Defense Force, MOD.

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APPLICATION for ECLIPSE and VLBI

8The proposed Observation sitesHot steam
trench area

SupplyUnloading area

IWO-Jima
Airbase area

IWO-Jima Airbase

The best weather
condition area.
The primaryobservation point

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Mt. Suribachi
Area

APPLICATION for ECLIPSE and VLBI

(alt. 170m)

9System architecture
WINDS(APAA)Open Content

JGN2+

HD images
HD VideoConference(to UENO)

Mobile station

IWO-Jima

Koganei
Earth Station

Otemachi IDC (大手町,東京)

155Mbps

Tokyo area

The Internet

Any Internet
broadcasting service
Any TV network(overseas/domestic)NHK(Japan)
Any science museums

UENO National
Science Museum(HD Video Conference
to IWO-Jima)

Many citizens can share the intellectual excitement to natural science.
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APPLICATION for ECLIPSE and VLBI

10Live• Make the most of WINDS– 150Mbps link from IWO-Jima• It enable to transmit 1~3 HD quality video.
– The Solar eclipse image, a landscape…

• NHK is planning the solar eclipse special
program using these images.

– Bi-directional link
• HD Video conference between IWO-Jima andUENO National Science Museum.
– The scientist in an observation site lectures about
the solar eclipse.
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APPLICATION for ECLIPSE and VLBI

11conclusion
WE HOPE THE WEATHER CLEARS UP .
See you on July 22th.

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APPLICATION for ECLIPSE and VLBI

12APPLICATION FOR VLBI

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APPLICATION for ECLIPSE and VLBI

13

About VLBI

Recording to MT
MT
ATOMIC CLOCK

Correlator

MTMT

ImageMTMT

ATOMIC CLOCK

MT

MT

MT

ATOMIC CLOCK

Transport

Earth

MT: Magnetic Tape
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APPLICATION for ECLIPSE and VLBI

14

About e-VLBI

Connect to the correlator
Correlationin real-timeCorrelator

ATOMIC CLOCKATOMIC CLOCK

Image

High speed Network
ATOMIC CLOCK

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APPLICATION for ECLIPSE and VLBI

Earth15

Issue• In case of MT– The validity of observational data is not known until it processes
MTs with the Correlator.

• In case of e-VLBI– Cost issue.
• No optical fiber has been landed in Ogasawara.

WINDS APAA(155Mbps) can send a partial observational
data to the correlation system.
The data is verified by correlation processing of the partial
data without MT.
WINDS (622Mbps) can send a full set of observational data .
It’s application for the satellite based e-VLBI. (proposed byNICT)
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APPLICATION for ECLIPSE and VLBI16

VLBI+WINDS
WINDS
partial dataor full

Verify the dataMT
ATOMIC CLOCK

Correlator
MTMTLand LineA partial
Image or full
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ATOMIC CLOCKMT

APPLICATION for ECLIPSE and VLBIMT
ATOMIC CLOCKEarth17

Location plan(June, 2009) (NAOJ)
The array consists of 4 stations.

MIZUSAWA(水沢), IWATE
IRIKI(入来), KAGOSHIMACorrelation center

ISHIGAKIJIMA(石垣島), OKINAWA
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MITAKA(三鷹), TOKYOAPPLICATION for ECLIPSE and VLBIOGASAWARA(小笠原), TOKYO18

Location plan(June, 2009) (NAOJ)

Mitaka(CorrelationCenter)

Land line

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APPLICATION for ECLIPSE and VLBIReal-time e-VLBI experiment by WINDS (plan)
Satellite based e-VLBI will
support rapid
earth rotation measurement by
remote antennas(This is an initial localized experiment)

Radio Galaxy emission(white noise)

NICT Koganei
11m radio telescope

WINDSSatellite
JGN2 test-bed network
as other telescope data
Transfer 622Mbps
continuous e-VLBI data

Kashima
34m radiotelescope
20

WINDS mobile station

WINDS fixed station

NICT Kashima Space Research Center

VLBI productby high-speed
real-timeprocessing

Thank you.
Contact : masafumi.oe@nao.ac.jp

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