List of Digital Object Identifiers (DOIs) minted to Research Datasets

NICT, ICSU-WDS national committee of Japan

Wind Profiler at NICT Tokyo (1993-2003)

DOI: 10.17591/14791-10297
Landing page: http://www2.nict.go.jp/bigdata/wds/doi-landingpage/wds/10.17591__14791-10297.html

Wind profiler is a Doppler radar for measuring wind from the ground. It can measure wind vectors above the radar site utilizing the clear-air echo. Clear-air echo is caused by fluctuation of the refractive index in which the scale is half the radar wavelength (Bragg scattering). From the Doppler shift of along a certain beam direction, the line-of-sight velocity along the radar beam can be measured. Assuming horizontal homogeneity of wind field, three components of wind vectors can be measured by at least three beam observations. Observable height range of radars depends on transmit power, antenna size and radar frequency. This data is research data and was collected with the intent of using it for meteorological research. The National Institute of Information and Communications Technology (NICT) and researcher in charge of this page make no warranties as to the accuracy of the data. The NICT will modify the data or may suspend this service at any time. Data divide into each day and its name shows year, month and day. Head of names "tk" shows NICT(Tokyo) data. (Example: tk970322.txt shows data of Tokyo on March 22, 1997) Data is averaged for one hour in time and for 150 meter in height. (Average of 0:00-1:00 shows 0:00 and average of 300-450 m shows 300 m)

Mesospheric wind velocity data (30min. mean) observed with MF radar at Poker Flat, Alaska

DOI: 10.17591/55838dbd6c0ad
Landing page: http://www2.nict.go.jp/bigdata/wds/doi-landingpage/wds/10.17591__55838dbd6c0ad.html

Horizontal wind velocity in the altitude range of approx. 60-90 km is observed with Poker Flat MF (medium frequency) radar, using the radar wave at 2.43 MHz. The radar receives weak radio echo signals returned from the weakly ionized atmosphere (ionospheric D-region) at the target altitudes, to deduce horizontal air motions (Murayama, Y., K. Igarashi, D. D. Rice, B. J. Watkins, R. L. Collins, K. Mizutani, Y. Saito, and S. Kainuma, Medium Frequency Radars in Japan and Alaska for Upper Atmosphere Observations, IEICE Trans., E83-B, pp.1996-2003, 2000). Poker Flat MF radar has been constructed as part of Japan-US joint research program of Arctic middle & upper atmosphere ("Alaska Project") in collaboration between National Institute of Information and Communications Technology, Japan (formerly Communications Research Laboratory), and Geophysical Institute, University of Alaska Fairbanks.

Wp Index

DOI: 10.17593/13437-46800
Landing page: http://www2.nict.go.jp/bigdata/wds/doi-landingpage/wds/10.17593__13437-46800.html

The Wp index was proposed by Nose et al. [2012] to measure the Pi2 wave power at low latitude. It is derived from 1-s geomagnetic field variations in the H component measured at 11 stations at low latitude.

Magnetotelluric Data at Muroto, Japan

DOI: 10.17593/13882-05900
Landing page: http://www2.nict.go.jp/bigdata/wds/doi-landingpage/wds/10.17593__13882-05900.html

This dataset includes data measured with induction magnetometer and electrodes that are installed at Muroto, Japan.

Dst Index

DOI: 10.17593/14515-74000
Landing page: http://www2.nict.go.jp/bigdata/wds/doi-landingpage/wds/10.17593__14515-74000.html

The Dst index was proposed by Sugiura [1964] to measure the magnitude of the current which produces the axially symmetric disturbance field. It is derived from geomagnetic field variations in the H component measured at 4 stations at low latitude.

AE Index

DOI: 10.17593/15031-54800
Landing page: http://www2.nict.go.jp/bigdata/wds/doi-landingpage/wds/10.17593__15031-54800.html

The AE index was proposed by Davis and Sugiura [1966] to measure a global electrojet activity in the auroral zone. It is derived from geomagnetic field variations in the H component measured at 12 stations along the auroral zone in the northern hemisphere.

Ionogram at Kokubunji, Japan

DOI: 10.17594/567ce8e9d3a52
Landing page: http://www2.nict.go.jp/bigdata/wds/doi-landingpage/wds/10.17594__567ce8e9d3a52.html

The ionogram is recorded tracings of high-frequency (HF) radio pulses reflected in the ionosphere. It is produced by the vertical incidence ionospheric sounder (ionosonde) at Kokubunji, Tokyo, Japan. The sounding frequency is swept from 1 to 30 MHz. The height is calculated from the traveling time of the sounding radio wave and the light velocity, i.e., virtual height. Echo traces are composed of ordinary and extraordinary mode by the effect of the Earth's magnetic field and polarizations of the sounding wave. Ionograms are obtained at regular intervals of 15 min and contain several important factors such as the ordinary mode critical frequencies or maximum reflection frequencies of (foE, foF1, foF2) and the minimum virtual heights (h'E, h'F1, h'F2) corresponding to the E (90-120 km) and F (>120 km) layers of the ionosphere. Occasionally, sporadic E layers at a nearly constant height are observed in the E region. Time is Japanese Standard Time (JST), which is UTC+9 hours.

Automatically scaled parameters of Ionogram at Kokubunji, Japan

DOI: 10.17594/567ced0bbccf9
Landing page: http://www2.nict.go.jp/bigdata/wds/doi-landingpage/wds/10.17594__567ced0bbccf9.html

Ionospheric parameters are automatically scaled from ionograms which are obtained at Kokubunji, Tokyo, Japan by the swept frequency ionosonde for the range between 1 and 30 MHz. Scaled parameters are the ordinary-mode critical frequencies (foE, foF1, foF2) and the minimum virtual heights (h'E, h'F1, h'F2) corresponding to E (90-120 km), and F (> 120km) layers of the ionosphere; and the minimum observation frequency (fmin), which can be a measure of the D (80-90 km) region electron density. These parameters are obtained by the pattern recognition method basically every 15 minutes. Time is Japanese Standard Time (JST), which is UTC+9 hours. Detailed explanation and interpretation of ionograms are found in "U.R.S.I. Handbook of Ionogram Interpretation and Reduction, Report UAG-23A (1972)."

Manually scaled parameters of Ionogram at Kokubunji, Japan

DOI: 10.17594/567ced454d15b
Landing page: http://www2.nict.go.jp/bigdata/wds/doi-landingpage/wds/10.17594__567ced454d15b.html

Ionospheric parameters are manually scaled from ionograms which are obtained at Kokubunji, Tokyo, Japan by the swept frequency ionosonde for the range between 1 and 30 MHz.. Scaled parameters are the ordinary-mode critical frequencies (foE, foF1, foF2) and the minimum virtual heights (h'E, h'F1, h'F2) corresponding to E (90-120 km), and F (> 120km) layers of the ionosphere; and the minimum observation frequency (fmin), which can be a measure of the D (80-90 km) region electron density; the F layer transmission factor for the distance of 3000 km (M(3000)F2, M(3000)F1); and the sporadic E parameters (foEs, h'Es), if it exists. These parameters are manually scaled by experienced specialists every one hour. Time is Japanese Standard Time (JST), which is UTC+9 hours. Detailed explanation and interpretation of ionograms are found in "U.R.S.I. Handbook of Ionogram Interpretation and Reduction, Report UAG-23A (1972)."

Manually scaled parameters of Ionogram at Wakkanai, Japan

DOI: 10.17594/5704641f8b11d
Landing page: http://www2.nict.go.jp/bigdata/wds/doi-landingpage/wds/10.17594__5704641f8b11d.html

Ionospheric parameters are manually scaled from ionograms which are obtained at Wakkanai, Hokkaido, Japan by the swept frequency ionosonde for the range between 1 and 30 MHz. Scaled parameters are the ordinary-mode critical frequencies (foE, foF1, foF2) and the minimum virtual heights (h'E, h'F1, h'F2) corresponding to E (90-120 km), and F (> 120km) layers of the ionosphere; and the minimum observation frequency (fmin), which can be a measure of the D (80-90 km) region electron density; the F layer transmission factor for the distance of 3000 km (M(3000)F2, M(3000)F1); and the sporadic E parameters (foEs, h'Es), if it exists. These parameters are manually scaled by experienced specialists every one hour. Time is Japanese Standard Time (JST), which is UTC+9 hours. Detailed explanation and interpretation of ionograms are found in "U.R.S.I. Handbook of Ionogram Interpretation and Reduction, Report UAG-23A (1972)."

Ionogram at Wakkanai, Japan

DOI: 10.17594/5704b5259137a
Landing page: http://www2.nict.go.jp/bigdata/wds/doi-landingpage/wds/10.17594__5704b5259137a.html

The ionogram is recorded tracings of high-frequency (HF) radio pulses reflected in the ionosphere. It is produced by the vertical incidence ionospheric sounder (ionosonde) at Wakkanai, Hokkaido, Japan. The sounding frequency is swept from 1 to 30 MHz. The height is calculated from the traveling time of the sounding radio wave and the light velocity, i.e., virtual height. Echo traces are composed of ordinary and extraordinary mode by the effect of the Earth's magnetic field and polarizations of the sounding wave. Ionograms are obtained at regular intervals of 15 min and contain several important factors such as the ordinary mode critical frequencies or maximum reflection frequencies of (foE, foF1, foF2) and the minimum virtual heights (h'E, h'F1, h'F2) corresponding to the E (90-120 km) and F (>120 km) layers of the ionosphere. Occasionally, sporadic E layers at a nearly constant height are observed in the E region. Time is Japanese Standard Time (JST), which is UTC+9 hours.

Automatically scaled parameters of Ionogram at Wakkanai, Japan

DOI: 10.17594/5704b5444c661
Landing page: http://www2.nict.go.jp/bigdata/wds/doi-landingpage/wds/10.17594__5704b5444c661.html

Ionospheric parameters are automatically scaled from ionograms which are obtained at Wakkanai, Hokkaido, Japan by the swept frequency ionosonde for the range between 1 and 30 MHz. Scaled parameters are the ordinary-mode critical frequencies (foE, foF1, foF2) and the minimum virtual heights (h'E, h'F1, h'F2) corresponding to E (90-120 km), and F (> 120km) layers of the ionosphere; and the minimum observation frequency (fmin), which can be a measure of the D (80-90 km) region electron density. These parameters are obtained by the pattern recognition method basically every 15 minutes. Time is Japanese Standard Time (JST), which is UTC+9 hours. Detailed explanation and interpretation of ionograms are found in "U.R.S.I. Handbook of Ionogram Interpretation and Reduction, Report UAG-23A (1972)."

Ionogram at Yamagawa, Japan

DOI: 10.17594/5704b78099ac0
Landing page: http://www2.nict.go.jp/bigdata/wds/doi-landingpage/wds/10.17594__5704b78099ac0.html

The ionogram is recorded tracings of high-frequency (HF) radio pulses reflected in the ionosphere. It is produced by the vertical incidence ionospheric sounder (ionosonde) at Yamagawa, Kagoshima, Japan. The sounding frequency is swept from 1 to 30 MHz. The height is calculated from the traveling time of the sounding radio wave and the light velocity, i.e., virtual height. Echo traces are composed of ordinary and extraordinary mode by the effect of the Earth's magnetic field and polarizations of the sounding wave. Ionograms are obtained at regular intervals of 15 min and contain several important factors such as the ordinary mode critical frequencies or maximum reflection frequencies of (foE, foF1, foF2) and the minimum virtual heights (h'E, h'F1, h'F2) corresponding to the E (90-120 km) and F (>120 km) layers of the ionosphere. Occasionally, sporadic E layers at a nearly constant height are observed in the E region. Time is Japanese Standard Time (JST), which is UTC+9 hours.

Automatically scaled parameters of Ionogram at Yamagawa, Japan

DOI: 10.17594/5704b79d253fd
Landing page: http://www2.nict.go.jp/bigdata/wds/doi-landingpage/wds/10.17594__5704b79d253fd.html

Ionospheric parameters are automatically scaled from ionograms which are obtained at Yamagawa, Kagoshima, Japan by the swept frequency ionosonde for the range between 1 and 30 MHz. Scaled parameters are the ordinary-mode critical frequencies (foE, foF1, foF2) and the minimum virtual heights (h'E, h'F1, h'F2) corresponding to E (90-120 km), and F (> 120km) layers of the ionosphere; and the minimum observation frequency (fmin), which can be a measure of the D (80-90 km) region electron density. These parameters are obtained by the pattern recognition method basically every 15 minutes. Time is Japanese Standard Time (JST), which is UTC+9 hours. Detailed explanation and interpretation of ionograms are found in "U.R.S.I. Handbook of Ionogram Interpretation and Reduction, Report UAG-23A (1972)."

Manually scaled parameters of Ionogram at Yamagawa, Japan

DOI: 10.17594/5704b7b16d387
Landing page: http://www2.nict.go.jp/bigdata/wds/doi-landingpage/wds/10.17594__5704b7b16d387.html

Ionospheric parameters are manually scaled from ionograms which are obtained at Yamagawa, Kagoshima, Japan by the swept frequency ionosonde for the range between 1 and 30 MHz. Scaled parameters are the ordinary-mode critical frequencies (foE, foF1, foF2) and the minimum virtual heights (h'E, h'F1, h'F2) corresponding to E (90-120 km), and F (> 120km) layers of the ionosphere; and the minimum observation frequency (fmin), which can be a measure of the D (80-90 km) region electron density; the F layer transmission factor for the distance of 3000 km (M(3000)F2, M(3000)F1); and the sporadic E parameters (foEs, h'Es), if it exists. These parameters are manually scaled by experienced specialists every one hour. Time is Japanese Standard Time (JST), which is UTC+9 hours. Detailed explanation and interpretation of ionograms are found in "U.R.S.I. Handbook of Ionogram Interpretation and Reduction, Report UAG-23A (1972)."

Ionogram at Okinawa, Japan

DOI: 10.17594/5704b8b1d8dbc
Landing page: http://www2.nict.go.jp/bigdata/wds/doi-landingpage/wds/10.17594__5704b8b1d8dbc.html

The ionogram is recorded tracings of high-frequency (HF) radio pulses reflected in the ionosphere. It is produced by the vertical incidence ionospheric sounder (ionosonde) at Okinawa, Japan. The sounding frequency is swept from 1 to 30 MHz. The height is calculated from the traveling time of the sounding radio wave and the light velocity, i.e., virtual height. Echo traces are composed of ordinary and extraordinary mode by the effect of the Earth's magnetic field and polarizations of the sounding wave. Ionograms are obtained at regular intervals of 15 min and contain several important factors such as the ordinary mode critical frequencies or maximum reflection frequencies of (foE, foF1, foF2) and the minimum virtual heights (h'E, h'F1, h'F2) corresponding to the E (90-120 km) and F (>120 km) layers of the ionosphere. Occasionally, sporadic E layers at a nearly constant height are observed in the E region. Time is Japanese Standard Time (JST), which is UTC+9 hours.

Automatically scaled parameters of Ionogram at Okinawa, Japan

DOI: 10.17594/5704b8ce63d3b
Landing page: http://www2.nict.go.jp/bigdata/wds/doi-landingpage/wds/10.17594__5704b8ce63d3b.html

Ionospheric parameters are automatically scaled from ionograms which are obtained at Okinawa, Japan by the swept frequency ionosonde for the range between 1 and 30 MHz. Scaled parameters are the ordinary-mode critical frequencies (foE, foF1, foF2) and the minimum virtual heights (h'E, h'F1, h'F2) corresponding to E (90-120 km), and F (> 120km) layers of the ionosphere; and the minimum observation frequency (fmin), which can be a measure of the D (80-90 km) region electron density. These parameters are obtained by the pattern recognition method basically every 15 minutes. Time is Japanese Standard Time (JST), which is UTC+9 hours. Detailed explanation and interpretation of ionograms are found in "U.R.S.I. Handbook of Ionogram Interpretation and Reduction, Report UAG-23A (1972)."

Manually scaled parameters of Ionogram at Okinawa, Japan

DOI: 10.17594/5704b8e3a7ffa
Landing page: http://www2.nict.go.jp/bigdata/wds/doi-landingpage/wds/10.17594__5704b8e3a7ffa.html

Ionospheric parameters are manually scaled from ionograms which are obtained at Okinawa, Japan by the swept frequency ionosonde for the range between 1 and 30 MHz. Scaled parameters are the ordinary-mode critical frequencies (foE, foF1, foF2) and the minimum virtual heights (h'E, h'F1, h'F2) corresponding to E (90-120 km), and F (> 120km) layers of the ionosphere; and the minimum observation frequency (fmin), which can be a measure of the D (80-90 km) region electron density; the F layer transmission factor for the distance of 3000 km (M(3000)F2, M(3000)F1); and the sporadic E parameters (foEs, h'Es), if it exists. These parameters are manually scaled by experienced specialists every one hour. Time is Japanese Standard Time (JST), which is UTC+9 hours. Detailed explanation and interpretation of ionograms are found in "U.R.S.I. Handbook of Ionogram Interpretation and Reduction, Report UAG-23A (1972)."