Dynamics of the ionosphere observed by theSuperDARN HOkkaido Pair of (HOP) HF radars
during the 4 November storm event

SuperDARN HOP West radar(2014.10-)

N. Nishitani* and T. Hori (STEL, Nagoya Univ.)
SuperDARN HOP radars group1

Super Dual Auroral Radar Network(SuperDARN)

Number of operating HF radars: 34 (23 in the northern and 11 in thesouthern hemispheres) as of Oct 24, 2014
Standard temporal resolution: 1-2 min2

SuperDARN Hokkaido radar (2006.11-) # of papers: 25
The Hokkaido radar
covers 38-80 geomag.
lat, Corresponding to
L= 1.6 to 33Airglow imagers

Existing SuperDARN network

Study of ionosphere, thermosphereand upper mesosphere

GPSJapan obs.
Network.airglow imager.GPS

Hokkaido East radar(2006.11-)
Hokkaido West radar(2014.10-)

Unified understanding of the dynamics of the high- to
mid-latitude upper atmosphere3Summary of STE events observedby the SuperDARN HOP radars• A. 27-30 Aug 2014
– Weak SAPS on 27 (10-13 UT) and 29 Aug (10-11 UT)– SWF on 8 Sep (~24 UT)• B. 8-13 Sep 2014
– Weak SAPS on 11 (11-13 UT) and 12 Sep (11-12 UT)• C. 19-27 Oct 2014
– SAPS activity on 28 (10-11 UT) and 29 Oct (10-11 UT)– SWF on 19 Oct (~04 UT)• D. 1-4 Nov 2014
– SAPS on 4 Nov (13-16 UT)

4Event study: 04 Nov 20145

http://wdc.kugi.kyoto-u.ac.jp/index.html

SD HOP East / West radar data on 4 Nov 2014
Quicklook plot accessible at: http://center.stelab.nagoya-u.ac.jp/hokkaido/

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04 Nov 2014 HKW/HOK movie(weak storm, Dst >= -30 nT)
Movie made using the ERG-SC TDAS / IUGONET SPEDAS software

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SAPS in HOP East FOV before ~1400 UT, SAPS in HOP West FOV after ~ 1400 UT

NICT near real time data (4 Nov 2014)
http://kogma.nict.go.jp/cgi-bin/geomag-interface-j/• Geomagnetic X or H component
variations at PBK, TIK, DIK, AMD andKSM• Before ~1400 UT westward jet near PBK• After 1400 UT westward jet near TIK, DIK• Seem to be associated with the westward
motion of SAPS structure

PBK

TIK

http://sd-www.jhuapl.edu/rapidmag/html/
RapidMag_stations.html

DIK・ KSM

AMDKSM001224 UT8NICT near real time data (4 Nov 2014)
http://kogma.nict.go.jp/cgi-bin/geomag-interface-j/• Geomagnetic X or H component
variations at PBK, TIK, DIK, AMD andKSM• Before ~1400 UT westward jet near PBK• After 1400 UT westward jet near TIK, DIK• Seem to be associated with the westward
motion of SAPS structure

PBK

TIK

http://sd-www.jhuapl.edu/rapidmag/html/
RapidMag_stations.html

DIK・ KSM

AMDKSM

08

14

20 UT

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Installation of HF radar wave remotereceiver in Nagoya (since Aug 2014)• Observing backlobe beam signals
in Nagoya to measure the verticalmotion of the ionosphericreflection point• Initial results have been obtained

ACF phase vs lag number10

SuperDARN Hokkaido East / West radars andinternational collaboration• Japan-USA collaboration– Trans North America subauroral region(50-60 geomag. Lat.)– Will be completed in 2013 FY• Japan-Russia collaboration– Siberian SuperDARN (JSPS-RFBR, H24-25)– Ekaterinburg radar started in Feb. 2012,
other 3 radars will be operational within 2years– Collaboration with other observation (HFDoppler, IS radar etc.)

UK• Japan-Australia collaboration– TIGER 3 will be operational soon
– Conjugate study in subauroral and midlatitude regions••

JapanRussia

Japan-UK collaboration (European midlatitude SuperDARN radar funded)Japan-China collaboration (Chinese mainland radar funding in application)
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Summary• SuperDARN Hokkaido West radar began its operation on 24 Oct
2014, to form the SuperDARN Hokkaido Pair of (HOP) radarssystem.
• 1-4 Nov 2014 STE event is a good one to demonstrate the capabilityof the SuperDARN HOP system, i.e., to clarity the longitudinalvariation of SAPS structure.
• As there are increasing number of midlatitude SuperDARN radars,international collaboration is getting more and more important for thestudy of the magnetosphere, ionosphere and thermosphere in thesubauroral and midlatitude region on a global scale.
• Remote HF radar wave receiver in Nagoya have been operating
since Aug 2014, trying to demonstrate the capability of monitoring theionospheric dynamics equatorward of SuperDARN radars, withrelatively low costs (~350,000 JPY per one set). We are looking forscientists interested in joining this project.
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