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Table 1 Radar techniques for investigating the MLT region

From: MF and HF radar techniques for investigating the dynamics and structure of the 50 to 110 km height region: a review

Radar technique Typical frequency (wavelength) Frequency range Typical height coverage Height resolution Time resolution Measured quantities Status
Meteor radar 30 MHz (10 m) MF to UHF 75–110 km 1–5 km 30–60 min u, v, T, ρ, radiants, meteoroid velocities Current
LF ionospheric spaced antenna drift 200 kHz (1500 m) 200 kHz (1500 m) 90–100 km (night) 1 height uncertainty ~2 km 1 min u, v Retired
Dedicated DAE/DPE PR radar 3 MHz (100 m) 3 MHz (100 m) 60–90 km (day) 1–3 km 1–5 min Ne, υ Retired
85–100 km (night)
MF/HF PR SA radar 3 MHz (100 m) 1.94 to 3.18 MHz 60–100 km (day) 1–3 km 1–5 min u, v, Ne, υ Current
80–100 km (night)
MST radar 50 MHz (6 m) 44.75 to 64 MHz 0.5–20 km 150–600 m 5 min u, v, w Current
60–80 km (day)
SuperDARN radar 12 MHz (25 m) 8–20 MHz As for meteor radar As for meteor radar As for meteor radar As for meteor radar Current
  1. The symbols represent the following parameters: u is the zonal wind magnitude, v is the meridional wind magnitude, w is the vertical wind magnitude, T is the temperature, ρ is the neutral density, N e the electron number density, and υ is the collision frequency