The common time fitacf CDF data of SuperDARN Hokkaido East HF radar distributed by ERG-SC

2011-04-01 00:00:00

2199-12-31 23:59:59

Common time fitacf data obtained by SuperDARN Hokkaido East HF radar. The data set consists primarily of the backscatter power, spectral width, and Doppler velocity derived with radar echoes in the field-of-view of the radar beams with time resolutions of 1-2 min. Data files are distributed in the Common Data Format (CDF) through the ERG-SC repository

Online

Open

CDF

Data distributed with this CDF file can be used freely for scientific research. Please note that the data are not fully calibrated and may still contain glitches and errors which could yield scientifically wrong or misleading results. We strongly recommend working directly or checking with the PI (Nozomu Nishitani, ISEE, Nagoya Univ., E-mail: nisitani [at] isee.nagoya-u.ac.jp) and/or researchers of the other SuperDARN PI groups regarding data accuracy and interpretation. Data users must contact the PI before any form of presentation/publication including any fraction or the entire part of data. Please acknowledge the research grant which enables the construction and operation of the SuperDARN Hokkaido East HF radar. An example of the acknowledgement statement is as follows: This research was partially supported by Special Funds for Education and Research (Energy Transport Processes in Geospace, Institute for Space-Earth Environmental Research (ISEE), Nagoya University) of the Ministry of Education, Culture, Sports, Science, and Technology of Japan.

PT3S

PT3S

88.7

44.1

224.0

130.0

Hardware station ID

The unique numeric ID of the radar

Hardware year

This and the next parameter describe the date up until which the radar configuration described in the hardware parameter

Hardware second of year

This and the previous parameter describe the date up until which the radar configuration described in the hardware parameter

Hardware Geog. Latitude

The geographic latitude of the radar location, given in decimal degrees to 3 decimal places. Southern hemisphere values are negative

Hardware Geog. Longitude

The geographic longitude of the radar location, in degree given in decimal degrees to 3 decimal places. West longitude values are negative

Hardware altitude

The altitude above sealevel of the radar location, in meter

Hardware Scanning Boresite

The direction of the center of the field-of-view of the radar, in degree, relative to geographic North, positive clockwise

Hardware beam separation

The angular separation of two adjacent beams, in degree. Normally 3.24 degrees

Hardware vdir

The sign of the velocity direction, either +1 or -1, usually +1.(At the radar level, backscattered signals with frequencies above the transmitted frequency are assigned positive Doppler velocities while backscattered signals with frequencies below the transmitted frequency are assigned negative Doppler velocity. This convention can be reversed by changes in receiver design or in the data samping rate. This parameter is set to +1 or -1 to maintain the convention.)

Hardware Attenuation Step

The step size of the receiver attenuation in dB

Hardware Time Difference

The relative time delay of signal paths from the interferometer array to the receiver and the main array to the receiver, in microseconds

Hardware phidiff

The sign of the phase shift between interferometer and main array, either +1 or -1, usually +1

Hardware Interferometer Array Position

The offset distance between the mid points of the interferometer and main array, (1st component) in the direction along the main array, positive towards higher antenna numbers, (2nd component) in the direction perpendicular to the main array, positive values indicate that the interferometer array is in front of the main array, (3rd component) in the vertical direction, positive up, in meter

Hardware Receiver Rise Time

The rise time of the analog receiver, in microseconds

rgate_no_0

The range gate number for each pixel observed sequantially by the radar for the 75 range gate measurement

position_tbl_0

The table of geographical Latitudes and longitudes [deg] for the reflection points of radar echoes for the 75 range gate measurement

Epoch_0

The start time of each beam observation sequence in the CDF epoch format for the 75 range gate measurement

cpid_0

ID of observation mode for 75 range gate measurement

channel_0

ID of the channel used for the observation for the 75 range gate measurement. This value should be either of 0 (non-stereo radar) or 1 (channelA of a stereo radar)

int_time_0

Integration time over which received pulses are integrated to derive the fitting parameters for the 75 range gate measurement

azim_no_0

Number of the azimuthal direction of radar beam for the 75 range gate measurement

pwr_0

Backscatter power of radar echoes for the 75 range gate measurement

pwr_err_0

Error of Backscatter power of radar echoes for the 75 range gate measurement

spec_width_0

Spectral widths of radar echoes for the 75 range gate measurement

spec_width_err_0

Error of spectral widths of radar echoes for the 75 range gate measurement

vlos_0

Doppler velocity of radar echoes for the 75 range mode measurement. This Doppler velocity corresponds to the bulk velocity of ionospheric electrons perpendicular to the ambient magnetic field

vlos_err_0

Error of Doppler velocity of radar echoes for the 75 range gate measurement

elev_angle_0

Elevation angle of returning HF waves observed by a set of the main antennas and the interferometers for the 75 range gate measurement

elev_angle_err_0

Error of elevation angle for the 75 range gate measurement

phi_0

Phase offset derived by calculating the auto correlation function (ACF) for the 75 range gate measurement

phi_err_0

Error of phase offset for the 75 range gate measurement

echo_flag_0

Echo flag (ionospheric/ground) of radar echoes for 75 range gate measurement. 1: ionospheric echo, 0: ground scatter, based on the empirical criteria by Millan et al.

quality_0

Data quality flag of radar echoes for the 75 range gate measurement. This value is how many criteria (described in "quality_flag_?" in detail) are satisfied. 0 means that no condition for bad/poor data is satisfied, that is, the data is in good shape. The data quality becomes worse as quality_? increases

quality_flag_0

Breakdown of judgements for criteria in evaluating the data quality flag of radar echoes for the 75 range gate measurement. Each bit status of this value (1 byte integer) show if each criterion is satisfied. LSB: backscatter power is less 3dB, 2nd bit: currently unused, 3rd bit: spectral width is greater than 1000 m/s, 4th bit (MSB): currently unused

scanno_0

Serial number (in a CDF file) referring to each 2D scan. (Nominally 16) beams with the same scanno_? form a full field-of-view scan.

scanstartflag_0

If this value is 1, then the current beam is the start of a new 2D scan

lagfr_0

The lag time in microsecond for the first range gate for the 75 range gate measurement

smsep_0

The sampling separation in microsecond between neighboring range gates

nrang_max_0

Maximum range gate number for the 75 range gate measurement. This should be 75

tfreq_0

Frequency in kHz of transmitted HF waves for the 75 range gate measurement

noise_0

Noise level (in dB) in receiving radar echoes for the 75 range gate measurement

num_ave_0

This value shows how many pulse sequences are integrated to evaluate ACFs for a beam

txpl_0

Time width in microsecond of the entire pulse sequences for each range gate for the 75 range gate measurement

rgate_no_1

The range gate number for each pixel observed sequantially by the radar for the 110 range gate measurement

position_tbl_1

The table of geographical Latitudes and longitudes [deg] for the reflection points of radar echoes for the 110 range gate measurement

Epoch_1

The start time of each beam observation sequence in the CDF epoch format for the 110 range gate measurement

cpid_1

ID of observation mode for 110 range gate measurement

channel_1

ID of the channel used for the observation for the 110 range gate measurement. This value should be either of 0 (non-stereo radar) or 1 (channelA of a stereo radar)

int_time_1

Integration time over which received pulses are integrated to derive the fitting parameters for the 110 range gate measurement

azim_no_1

Number of the azimuthal direction of radar beam for the 110 range gate measurement

pwr_1

Backscatter power of radar echoes for the 110 range gate measurement

pwr_err_1

Error of Backscatter power of radar echoes for the 110 range gate measurement

spec_width_1

Spectral widths of radar echoes for the 110 range gate measurement

spec_width_err_1

Error of spectral widths of radar echoes for the 110 range gate measurement

vlos_1

Doppler velocity of radar echoes for the 110 range mode measurement. This Doppler velocity corresponds to the bulk velocity of ionospheric electrons perpendicular to the ambient magnetic field

vlos_err_1

Error of Doppler velocity of radar echoes for the 110 range gate measurement

elev_angle_1

Elevation angle of returning HF waves observed by a set of the main antennas and the interferometers for the 110 range gate measurement

elev_angle_err_1

Error of elevation angle for the 110 range gate measurement

phi_1

Phase offset derived by calculating the auto correlation function (ACF) for the 110 range gate measurement

phi_err_1

Error of phase offset for the 110 range gate measurement

echo_flag_1

Echo flag (ionospheric/ground) of radar echoes for 110 range gate measurement. 1: ionospheric echo, 0: ground scatter, based on the empirical criteria by Millan et al.

quality_1

Data quality flag of radar echoes for the 110 range gate measurement. This value is how many criteria (described in "quality_flag_?" in detail) are satisfied. 0 means that no condition for bad/poor data is satisfied, that is, the data is in good shape. The data quality becomes worse as quality_? increases

quality_flag_1

Breakdown of judgements for criteria in evaluating the data quality flag of radar echoes for the 110 range gate measurement. Each bit status of this value (1 byte integer) show if each criterion is satisfied. LSB: backscatter power is less 3dB, 2nd bit: currently unused, 3rd bit: spectral width is greater than 1000 m/s, 4th bit (MSB): currently unused

scanno_1

Serial number (in a CDF file) referring to each 2D scan. (Nominally 16) beams with the same scanno_? form a full field-of-view scan.

scanstartflag_1

If this value is 1, then the current beam is the start of a new 2D scan

lagfr_1

The lag time in microsecond for the first range gate for the 110 range gate measurement

smsep_1

The sampling separation in microsecond between neighboring range gates

nrang_max_1

Maximum range gate number for the 110 range gate measurement. This should be 110

tfreq_1

Frequency in kHz of transmitted HF waves for the 110 range gate measurement

noise_1

Noise level (in dB) in receiving radar echoes for the 110 range gate measurement

num_ave_1

This value shows how many pulse sequences are integrated to evaluate ACFs for a beam

txpl_1

Time width in microsecond of the entire pulse sequences for each range gate for the 110 range gate measurement