May 2017 Arecibo HF Experiments Paul A Bernhardt

May 2017 Arecibo HF Experiments Paul A. Bernhardt Naval Research Laboratory, Washington, DC

ROTHR DIR Schedule for NRL • Dates: 21 to 25 May 2017 • Times: • 14: 19 to 16: 18 GMT • Frequency Selection • Virginia: Place Ocean Scatter Twice Distance as from VA to PR • Texas: Place Ocean Scatter Twice Distance as from TX to PR (or the Best that can be Done) • Transmit Beam Azimuth Selection • VA to PR: 152 Degrees (5 Beams at 136, 144, 152, 160, 168 Degree Azimuths)

ROTHR DIR Azimuths for Arecibo Tests

NRL ROTHR Experiment Requests GMT Start Date Time (GMT) Stop Time (GMT) 2017/05/21 15: 47: 30 16: 17: 30 2017/05/22 15: 25: 00 15: 55: 00 2017/05/23 15: 03: 00 15: 33: 00 2017/05/24 14: 41: 00 15: 11: 00 2017/05/25 14: 19: 00 14: 49: 00 Note: Call (757) 421 -6159 QVI and WSBI Start Times Call Watch Supervisor at 757 -421 -6143 for Dwell Status Gordon Patterson Watch Supervisor Ask for Ionosonde Critical Frequencies • ROTHR Radar Modes • VA and TX Frequency Selection for DIR at Twice Distance to Arecibo, PR • Wave Form 119 (62. 5 Hz, 8. 33 k. Hz BW, 2. 024 s CIT) • Azimuths to Cover Plus/Minus 25 Degrees Around Arecibo • Virginia Transmitter DIR Azimuths: • Texas Transmitter DIR Azimuths. L

e. POP Times in May 2017 GMT Date Time (GMT) 2017/05/21 16: 02: 30 2017/05/22 15: 40: 00 2017/05/23 15: 18: 00 2017/05/24 14: 56: 00 2017/05/25 14: 34: 00 e. POP RRI Altitude (km) Time (AST) Antenna A Antenna B 404. 99 12: 02: 30 5. 1 MHz 412. 00 11: 40: 00 TBD 428. 96 11: 18: 00 TBD 447. 17 10: 56: 00 TBD 466. 56 10: 34: 00 TBD

e. POP Time 8. 187 MHz 5. 1 MHz

Altitude (km) Puerto Rico Ionosphere Profiles 17 May 2017 1400 to 1600 GMT Plasma Frequency (MHz)

Old Arecibo HF Schedule for NRL

Revised Arecibo HF Schedule for NRL

e. POP Orbits for NRL ROTHR with Arecibo GMT Date Time

NRL Experiment Arecibo Request Times AST Start Date Time (AST) Stop Time (AST) Freq. (MHz) Mode 2017/05/21 11: 47: 30 12: 17: 30 5. 1 MHz CW 2017/05/22 11: 25: 00 11: 55: 00 5. 1 MHz CW 1 1 Min On/Off 2017/05/23 11: 03: 00 11: 33: 00 5. 1 MHz CW Pulsed 3 s/1 s 2017/05/24 10: 00 16: 00 5. 1 and 8. 175 Multiple Modes 2017/05/25 10: 19: 00 10: 49: 00 5. 1 or 8. 175 Pulsed 3 s/1 s 1 Min Off/On

QVI Profiles from Puerto Rico

QVI Profiles from Texas

QVI Profiles from Virginia