IPY 2007-2008 Expression of Intent #422
Interhemispheric Study on Conjugacy and Non-conjugacy of Auroral and Polar Ionospheric Disturbances using Grou
nd-based Observation Network
Interhemispheric Study on Auroral Phenomena
Akira Kadokura1, Natsuo Sato1, Hisao Yamagishi1,Hiroshi Miyaoka1, Makoto Taguchi1, Akira S. Yukimatu1,
Yusuke Ebihara1, and many other collaborators
1National Institute of Polar Research, Japan
Concise outline of proposed activity
① To maintain and intensify the pre-existing conjugate auroral latitude observations between Syowa Station in Antarctica and observatories in Iceland. We have carried out the conjugate ground-based observations continuously since 1984, using the 3-axis fluxgate magnetometer, 3-component induction magnetometer, riometer, and VLF receiver. We have also carried out auroral optical observation in the whole season at Syowa and mainly during the equinox period at Iceland. So far, many studies concerning the interhemispheric comparison of various auroral latitude phenomena have been done using the observed data. Such a long-term observation is very valuable to monitor the long-term variation of the geospace environment surrounding the earth and can contribute to the Space Weather study. During the IPY 2007-2008 period, we would like to renew the data acquisition system to transfer the data to Japan in near real time and the data archiving system to make the data accessible for the community more quickly and more easily. We would like to also introduce a well-calibrated automatic optical observation system in Iceland, which enables us the auroral observation in the whole season.
Concise outline of proposed activity
② To develop the network of the unmanned magnetometer system in the Antarctic. We have already introduced 6 sets of the unmanned magnetometer system. Four of them were supplied from British Antarctic Survey (BAS) and two were developed in National Institute of Polar Research (NIPR). The data from our system can be obtained via Iridium satellite system in near real time. We will further develop and sophisticate our own system, and would like to increase the number of the observation points during the IPY 2007-2008 period, collaborating with pre-existing and planning manned and unmanned magnetometers by other countries.
Concise outline of proposed activity
③ To maintain other ground-based facilities at Syowa Station, including the Super Dual Auroral Radar Network (SuperDARN) Syowa South and Syowa East HF-radars and the imaging riometer. Both are operated in the framework of the international collaboration for global network observation. We will make the data archiving system of these observations more easily accessible for the community.
Mapping of Northern/Southern hemispheres with geomagnetic coordinate
Conjugate point of Syowa Station (IGRF model)
Station
Glat (deg)
Glon (deg)
Inv.lat
(deg)
Mlon (deg
)
MLT (hr)
at 0.0 UT
L valu
e
D (deg)
I (deg)
B (nT)
Tjornes
66.20 -17.12 66.41 71.26 23.46 6.25 -16.21 76.57 52321
Syowa -69.00 39.58 66.27 71.75 23.49 6.17 -48.68 -63.61 43178
Comparison of geomagnetic parameters (Epoch: 23:20:00 UT, 26 Sep, 2003)
SYOWA IcelandFluxgate magnetometer ○
Induction magnetometer ○
Riometer ○
VLF receiver ○
Imaging Riometer ○
All-sky TV camera ○ (only equinox)
All-sky monochromatic Imager ○ (from 2005)
Meridian Scanning Photometer
Fabry-Perot ImagerSuperDARN radar ○
MF-radar
Ionosonde
Multi-beam VHF Doppler radar
Instruments at conjugate stations
Unmanned sites in the southern hemisphere
Unmanned magnetometers in JARE
80 S30 E 40 E 50 E20 E
0 500 km
2000m
3000m
70 S
75 S
Map area
0 90 E
18090 W
昭和基地 S16
みずほ基地
3800m
H260
H15
MD120
MD240
MD364
MD500
MD620
ドームふじ 観測拠点
やまと山脈
MD
(中継拠点)
調査ルート
雪氷基本観測点
45次内陸調査ルート
Dome Fuji
Syowa
JARE-44 (2003) BAS-LPM
① Skallen [-69°40′24″, 39°24′07″E]
2003.1/15 ~ 2003.10/14
② Cape Omega [-68°34′39.4″, 41°04′54.1″E]
2003.1/31 ~ 2004 1/28
③ H100 [69°17'44"S, 41°19'15"E]
2003.1/2 ~ 2003.10/22
④ Dome Fuji [77°19'01"S, 39°42'12"E]
2003.2/6 ~ 2003.5/29, 2003.12/11-2004.6/9Yamato Mt.
H100
BelgianNew Station
Mizuho
1
2
3
4
JARE-45 (2004) BAS-LPM
① H100 [69°17'44"S, 41°19'15"E]
2004.8/18 ~10/20, 10/20~
② Mizuho [70°42‘7.7"S, 44°17‘4.1"E]
2004.10/18 ~
③ Middle Point [74°00’37.0"S, 42°59’30.4"E]
2004.10/29 ~
④ Dome Fuji [77°19'01.6"S, 39°42’31.7"E] 2004.12/22 -
1
2
3
4
JARE-46 (2005) NIPR-LPM
① S122 [70°01'16"S, 43°07'39"E]
② MD120 [71°49'38"S, 44°16'27"E]
JARE-45 BAS-LPMs are continued.
1
2
Comparison of BAS and NIPR type LPMs
BAS-LPM NIPR-LPMMagnetometer MAG-03MC MAG-03MC
Resolution 16 bit 16 bit
Noise level 1 nT 0.2 nTLow Pass Filter 100 Hz 15 Hz
Power consumption(1 sec sampling)
0.42 W 0.16 W
Data acquisitionFlash memory
card
Iridium satelliteFlash memory
card
Command sending × ○
Development of NIPR model LPMPower consumption : 0.16 W (winter-time, 1sec sampling)
Magnetometer ON time : 100ms at each sampling
Resolution: 0.2 nT, LPF cutoff: 15 Hz
Data recovery : By Iridium, once/day
Telecommunication: Data acquisition & Command sending
Iridium satellite
Transmit time : about 20 min for 1 day data (1 sec sampling)
- ,
Omega
H100
SYOWA
Skallen
BAS-LPM sites in JARE-44 (2003-
2004)
( 3 sites around Syowa,
Dome Fuji )
SITE Lat (deg) Lon (deg) Alt (m)
Start day
End day Days
H100 -69°17′44″ 41°19′15″E 1,317 2003.01.02
2003.10.22
293
Skallen -69°40′24″ 39°24′07″E 16 2003.01.15
2003.10.14
272
Cape Omega
-68°34′39″ 41°04′54″E 161 2003.01.31
2004.01.28
362
Dome Fuji -77°19′01″ 39°42′12″E 3,810 2003.02.06
2003.05.29
112
80km
Cape Omega
Skallen
H100
Dome Fuji
LPMs in JARE-44 in 2003-2004
Magnetic variation during 20-24 UT on 28 March, 2003
Skallen
Syowa
Omega
H100
Dome
① ②③
Equivalent current variation associated with WTS passage
Field test of NIPR model in JARE-46 in 2005
HF-radar network in the both hemisphere( SuperDARN )
Web page of WDC for Aurora
http://polaris.nipr.ac.jp/~aurora/