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Found 9 entries in the Bibliography.

Showing entries from 1 through 9

2018

Observation of equatorial plasma bubbles by the airglow imager on ISS-IMAP

Using 630 nm airglow data observed by an airglow imager on the International Space Station (ISS), the occurrence of equatorial plasma bubbles (EPBs) is studied. In order to examine the physical mechanisms in the boundary region between the Earth and the outer space, an ionosphere, mesosphere, upper atmosphere, and plasmasphere mapping (IMAP) mission had been conducted onboard the ISS since October 2012. The visible light and infrared spectrum imager (VISI) is utilized in the ISS-IMAP mission for nadir-looking observation ...

Nakata, Hiroyuki; Takahashi, Akira; Takano, Toshiaki; Saito, Akinori; Sakanoi, Takeshi;

Published by: Progress in Earth and Planetary Science Published on: 12/2018

YEAR: 2018 DOI: 10.1186/s40645-018-0227-0

2014

Variations of the neutral temperature and sodium density between 80 and 107 km above Troms\o during the winter of 2010-2011 by a new solid-state sodium lidar

A new solid-state sodium lidar installed at Ramfjordmoen, Troms\o (69.6\textdegreeN, 19.2\textdegreeE), started observations of neutral temperature together with sodium density in the mesosphere-lower thermosphere (MLT) region on 1 October 2010. The new lidar provided temperature data with a time resolution of 10 min and with good quality between \~80 and \~105 km from October 2010 to March 2011. This paper aims at introducing the new lidar with its observational results obtained over the first 6 months of observations. W ...

Nozawa, S.; Kawahara, T.; Saito, N.; Hall, C.; Tsuda, T.; Kawabata, T.; Wada, S.; Brekke, A.; Takahashi, T.; Fujiwara, H.; Ogawa, Y.; Fujii, R.;

Published by: Journal of Geophysical Research: Space Physics Published on: 01/2014

YEAR: 2014 DOI: 10.1002/2013JA019520

Joule heating; neutral temperature; polar MLT; sodium lidar

2013

Thermospheric tidal effects on the ionospheric midlatitude summer nighttime anomaly using SAMI3 and TIEGCM

This paper is the first study to employ a three-dimensional physics-based ionosphere model, SAMI3, coupled with the National Center for Atmospheric Research Thermosphere Ionosphere Electrodynamics General Circulation Model (TIEGCM) and Global Scale Wave Model to simulate the mesospheric and lower thermospheric tidal effects on the development of midlatitude summer nighttime anomaly (MSNA). Using this coupled model, the diurnal variation of MSNA electron densities at 300 km altitude is simulated on both June solstice (day ...

Chen, C.; Lin, C.; Chang, L.; Huba, J.; Lin, J.; Saito, A.; Liu, J;

Published by: Journal of Geophysical Research: Space Physics Published on: 06/2013

YEAR: 2013 DOI: 10.1002/jgra.50340

MSNA; SAMI3; tidal effect; TIEGCM

2012

Long-term variations of the nighttime electron density enhancement during the ionospheric midlatitude summer

This study, for the first time, presented the long-term variations of Midlatitude Summer Nighttime Anomaly (MSNA) in the two hemispheres by using 66 ground-based ionosonde observations from 1957 to 2010. MSNA is characterized by the feature of higher nighttime electron density than daytime density in the midlatitude region during local summer months. Observations from 66 ionosonde stations were used to calculate the MSNA index which is defined by the difference between nighttime and noontime NmF2 values. The MSNA ...

Chen, C.; Saito, A.; Lin, C.; Liu, J;

Published by: Journal of Geophysical Research Published on: 07/2012

YEAR: 2012 DOI: 10.1029/2011JA017138

ionization-uplift effect; midlatitude summer nighttime anomaly; MSNA index

2009

Super-medium-scale traveling ionospheric disturbance observed at midlatitude during the geomagnetic storm on 10 November 2004

Medium-scale traveling ionospheric disturbances (MSTIDs) whose peak-to-peak amplitude was larger than 20 TECU (=1016el/m2) were observed at midlatitude during the geomagnetic storm on 10 November 2004. This amplitude was more than 10 times larger than that of the average MSTID. High-resolution data of the GPS Earth Observation Network (GEONET) clarified the characteristic of the total electron content (TEC) disturbances over Japan on 10 November 2004. The disturbances started around 1000 UT in the central part of Japan. The ...

Nishioka, M.; Saito, A.; Tsugawa, T.;

Published by: Journal of Geophysical Research: Space Physics Published on:

YEAR: 2009 DOI: https://doi.org/10.1029/2008JA013581

super-MSTID; Ionosphere

2007

Summer-winter hemispheric asymmetry of the sudden increase in ionospheric total electron content and of the O/N ₂ ratio: Solar activity dependence

Tsugawa, T.; Zhang, S.-R.; Coster, A.; Otsuka, Y.; Sato, J.; Saito, A.; Zhang, Y.; Paxton, L.;

Published by: Journal of Geophysical Research Published on: Jan-01-2007

YEAR: 2007 DOI: 10.1029/2007JA012415

Low-latitude total electron content enhancement at low geomagnetic activity observed over Japan

Kutiev, Ivan; Otsuka, Yuichi; Saito, Akinori; Tsugawa, Takuya;

Published by: Journal of Geophysical Research: Space Physics Published on: