Study of medium-scale traveling ionospheric disturbances (MSTID) with sounding rockets and ground observations

Mamoru Yamamoto, Tomohiro Kato, Keigo Ishisaka, Tatsuhiro Yokoyama, Naomoto Iwagami, Takao Takahashi, Makoto Tanaka, Ken Endo, Atsushi Kumamoto, Shigeto Watanabe, Masa Yuki Yamamoto, Takumi Abe, Susumu Saito, Takuya Tsugawa, Michi Nishioka, Paul Bernhardt, Miguel Larsen

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Medium-scale traveling ionospheric disturbance (MSTID) is an interesting phenomenon in the F-region. The MSTID is frequent in summer nighttime over Japan, showing wave structures with wavelengths of 100-200 km, periodicity of about 1 hour, and propagation toward the southwest. The phenomena are observed by the total electron content (TEC) from GEONET, Japanese dense network of GPS receivers, and 630 nm airglow imagers as horizontal pattern. It was also measured as Spread-F events of ionograms or as field-aligned echoes of the MU radar. MSTID was, in the past, explained by Perkins instability while its low growth rate was a problem [1]. Recently 3D simulation study by Yokoyama et al. [2] hypothesized a generation mechanism of the MSTID, which stands on electromagnetic E/F-region coupling of the ionosphere. The hypothesis is that the MSTID first grows with polarization electric fields from sporadic-E, then show spatial structures resembling to the Perkins instability. We recently conducted an observation campaign to check this hypothesis. We launched JASA ISAS sounding rockets S-310-42 and S-520-27 at 23:00 JST and 23:57JST on July 20, 2013 while an MSTID event was monitored in real-time by the GPS-TEC from GEONET. We found 1-5mV/m northeastward/eastward electric fields during the flight. Variation of electric fileds was associated with horizontal distribution of plasma density. Wind velocity was measured by the TME and Lithium releases from S-310-42 and S-520-27 rockets, respectively, showing southward wind near the sporadic-E layer heights. These results are consistent to the expected generation mechanism shown above. In the presentation we will discuss electric-field results and its relationship with plasma density variability together with preliminary results from the neutral-wind observations.

Original languageEnglish
Title of host publication2014 31th URSI General Assembly and Scientific Symposium, URSI GASS 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781467352253
DOIs
Publication statusPublished - 2014 Oct 17
Event31st General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS 2014 - Beijing, China
Duration: 2014 Aug 162014 Aug 23

Publication series

Name2014 31th URSI General Assembly and Scientific Symposium, URSI GASS 2014

Other

Other31st General Assembly and Scientific Symposium of the International Union of Radio Science, URSI GASS 2014
CountryChina
CityBeijing
Period14/8/1614/8/23

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Networks and Communications

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