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IPY 2007-2008 Expression of Intent #422

IPY 2007-2008 Expression of Intent #422. Interhemispheric Study on Conjugacy and Non-conjugacy of Auroral and Polar Ionospheric Disturbances using Ground-based Observation Network Interhemispheric Study on Auroral Phenomena

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IPY 2007-2008 Expression of Intent #422

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  1. IPY 2007-2008 Expression of Intent #422 Interhemispheric Study on Conjugacy and Non-conjugacy of Auroral and Polar Ionospheric Disturbances using Ground-based Observation NetworkInterhemispheric 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

  2. Concise outline of proposed activity ①To 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.

  3. 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.

  4. 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.

  5. Mapping of Northern/Southern hemispheres with geomagnetic coordinate

  6. Conjugate point of Syowa Station (IGRF model) Comparison of geomagnetic parameters (Epoch: 23:20:00 UT, 26 Sep, 2003)

  7. Instruments at conjugate stations

  8. Unmanned sites in the southern hemisphere

  9. ２ 1 ３ １ 1 2 2 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 - 3 ４ 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. Unmanned magnetometers in JARE 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, 2003.12/11-2004.6/9 Syowa H100 Mizuho Yamato Mt. BelgianNew Station Dome Fuji

  10. Comparison of BAS and NIPR type LPMs

  11. Development of NIPR model LPM • Power 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)

  12. BAS-LPM sites in JARE-44 (2003-2004) （3 sites around Syowa, Dome Fuji） Omega SYOWA ８０ｋｍ - , H100 Skallen

  13. LPMs in JARE-44 in 2003-2004 Skallen Cape Omega H100 Dome Fuji

  14. Magnetic variation during 20-24 UT on 28 March, 2003 ② ③ ① Syowa Skallen Omega H100 Dome

  15. Equivalent current variation associated with WTS passage

  16. Field test of NIPR model in JARE-46 in 2005

  17. HF-radar network in the both hemisphere（SuperDARN）

  18. Web page of WDC for Aurora http://polaris.nipr.ac.jp/~aurora/

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