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Direct observation of coupling between F- and E-region FAIs Instruments

FERIX-2 (F- and E-Region Ionosphere Coupling Study 2). Direct observation of coupling between F- and E-region FAIs Instruments MU radar (imaging) of F-region FAI LTPR (portable radar) for E-region FAI GPS receiver network for F-region TID

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Direct observation of coupling between F- and E-region FAIs Instruments

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  1. FERIX-2 (F- and E-Region Ionosphere Coupling Study 2) Direct observation of coupling between F- and E-region FAIs • Instruments • MU radar (imaging) of F-region FAI • LTPR (portable radar) for E-region FAI • GPS receiver network for F-region TID • Airglow imager network for F-region TID and E-region structures • Location and Period • Period: June-Augst 2007 • Locations • MUR at Shigaraki • LTPR at Sakata, and receiving site at Niigata • Personnel: Yamamoto, A. Saito, S. Saito, Otsuka

  2. FERIX-2 experiment in June-August 2007 Simultaneous observation of FAI along the same geomagnetic field. F-region: MU radar E-region: LTPR (FAI = Field Aligned Irregularity) B-field LTPR in Sakata • MU radar (F-region FAI) • 16 beam experiment (green line) • 3 beam Doppler experiment • June-August 2004, 29 nights Niigata receiver LTPR in Sakata MU radar MU radar in Shigaraki • LTPR (E-region FAI) • Beam direction: Northwest • Interferometry capability • Every-night run Steer 16 beams in different azimuth angles, and detect F-region echoes that appears perpendicular direction to the geomagnetic field. The same as the MU radar, but detect echoes from the E-region FAI. Spatial distribution of echoes are determined by interferometry. Project F-region FAI (250-350km) and E-region FAI (100-120 km) along the geomagnetic field (B) for comparisons

  3. North Azimuth-elevation distribution SNR > 20 dB Interferometry result of E-region FAI echoes from FERIX-1 in 2004 Red curve：Field perpendicularity at 100 km height. 60° • E-region FAI echoes from Sakata appeared at 100– 110 km height, and distributed wide in azimuth direction. • Positive range-rate of the echoes corresponds to westward motion of the echoes. Blue Beam direction: AZ = - 60 deg. Green West Zenith Red Range-height distribution Height (km) SNR > 20 dB Range (km)

  4. June 18, 2004 (Case with E-FAI and F-FAI) • E-region and F-region echoes are well co-located when mapped along the B-field. • Both echoes propagated to the west or southwest with similar phase velocity.

  5. Summary • WIND and FERIX-2: Ionospheric observation campaigns are planned in Japan, aiming for MSTID, F- & E-region coupling, and plasma-neutral coupling studies. • Period: • WIND Rocket launch window = July 31 – August 17, 2007 • FERIX-2 = June – August 2007 • Expected collaboration: • GOX plasma density profiles • TIP over Japan and geomagnetic-conjugate region • TEC from TBB experiment • Additional beacon receiver from Taiwan. • Camera for Li experiment • Taiwan TMA camera system may be useful. • FORMOSAT-2 ISUAL • Rim imaging of MSTID would be very interesting.

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