Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 17 of 17 for “"HAARP"”.
-
MUIR Studies of nonlinear ionospheric interactions at HAARP
… High Frequency Active Auroral Research Program (HAARP) site in Alaska using the co-located Modular UHF Incoherent scatter Radar (MUIR). High frequency heating of the ionosphere produced plasma wave decay processes, the signatures of which were received by MUIR and interpreted with spectral …
-
Simultaneous multi-angle measurements of plasma turblence at HAARP
… a recent series of experiments employing the HAARP HF transmitter to generate and study strong Langmuir turbulence (SLT) in the interaction region of overdense ionospheric plasma. Diagnostics included the Modular UHF Ionospheric Radar (MUIR) sited at HAARP, the Super DARN-Kodiak HF radar, and …
-
Studies of aspect angle dependence of plasma turbulence at HAARP
… from a recent series of campaigns employing the HAARP HF transmitter to generate and study strong Langmuir turbulence (SLT) in the interaction region of overdense ionospheric plasma. Diagnostics included the Modular UHF Ionospheric Radar (MUIR) sited at HAARP, the Super DARN-Kodiak HF radar, and …
-
Investigations of the cascade of Langmuir wave turbulence over HAARP Observatory in Gakona, Alaska
… High Frequency Active Auroral Research Program (HAARP) Observatory in Gakona, Alaska. Measurements were taken remotely in February 2005 and March 2006 in order to focus study on the altitude variation and number of cascade lines. This data was cross-checked with a recently developed theory by Kuo …
-
A Multidimensional Characterization of MUIR Backscatter Spectra Resulting from Ionospheric Heating Experiments Performed at HAARP
… heating experiments, which we performed at the HAARP facility, are presented. We sought to provide a multidimensional characterization of the various artificial ionospheric heating features by varying HF aspect angle, HF pump frequency, UHF pointing angle, and heating pulse time. Through the use …
-
Tunable electrically small antenna for next generation ionospheric heating
… High Frequency Active Auroral Research Program (HAARP) array in Gakona, Alaska occupies approximately 1.2x105 m2 of land with 180 elements each 440 m2 in area. To match HAARP performance in a transportable array each antenna element must be miniaturized with increased power capability. The …
-
Non-Linear Magnetosphere-Ionosphere Interactions at High Latitudes
… High Frequency Active Auroral Research Program (HAARP) facility, Alaska, on March 12, 2013. During the experiment, HAARP transmitted in the direction of the magnetic zenith X-mode 4.57 MHz wave. The transmitted power was modulated with a frequency of 0.9 mHz, and it was pointed on a 20 km spot at …
-
Excitation of Langmuir wave turbulence in high-frequency (HF) pump waves over Gakona, Alaska
… High Frequency Active Auroral Research Program (HAARP) facility in Gakona, Alaska during the spring and summer of 2006. The PDI is the decay of an electromagnetic (EM) wave into an electron plasma wave (i.e., Langmuir wave) and an ion acoustic wave. When the excited Langmuir wave parametrically …
-
Structure of the polar electrojet antenna
… using amplitude-modulated radiation from the HAARP HF transmitter (1 MW power, 14 dB gain, 3.3-5.8 MHz carrier, 0.1-40 kHz modulation). The conductivity perturbations lead to perturbations to the natural flow of electrojet current in the lower ionosphere, resulting in ELF/VLF radiation at the …
-
Generation of acoustic-gravity waves in ionospheric HF heating experiments : simulating large-scale natural heat sources
… High-frequency Active Auroral Research Program (HAARP) facility in order to physically simulate the process of AGW/TID generation by large-scale thermal gradients in the ionosphere. In these ionospheric HF heating experiments, we create some time-varying artificial thermal gradients at an …
-
Investigation of thermal filamentation instability over Gakona, Alaska
… ionospheric plasmas, carried out at the HAARP facility in Gakona, Alaska in summer 2005, spring 2006, and summer 2006, a weakening in ionogram traces was observed during O-mode and X-mode heating, leading to a scenario detailing the effects of thermal filamentation and short-scale …
-
Excitation of forced ion acoustic waves, large plasma sheets, and magnetic field fluctuations over Gakona, Alaska
… summer 2007 to winter 2008, using DoD/NSF-funded HAARP facilities and our own optical (ASIS) and radio instruments (VLF receiving system of IRIS) aided by GPS satellites as well as AMISR radar at Poker Flat, Alaska. We suggest that "Forced ion acoustic waves" detected by MUIR radar on Oct. 29 …
-
The Replicator : on the social destruction of fact through replication as art
… Wall and Tower (2009), Laurent Grasso's HAARP (2009), and Daniel G. Baird's Soyuz/ Progress (2008), that demonstrate a multiplicity of historical and technological concerns that are the inevitably object of replication. Replication belongs first and foremost to the scientific method as …
-
A Multi-Constellation Multi-Frequency GNSS Software Receiver Design for Ionosphere Scintillation Studies
… monitoring and data collection system at HAARP, Alaska. The data collection setup includes a custom narrow band front end that collects GPS L1, L2 IF samples and two reconfigurable USRP2 based RF front ends to collect wideband GPS L5 and GLONASS L1 and L2 signals. The results confirm that …
-
Electron Temperature Enhancement Effects on Plasma Irregularities Associated with Charged Dust in the Earth's Mesosphere
… two experiment campaigns have been performed at HAARP, Gakona, Alaska. Preliminary observation results look promising for the existence of PMSE turn-on overshoot. However, more careful experiments need to be done before firm conclusions can be drawn. The new designed Echotek digital receiver is …
-
New-Measurement Techniques to Diagnose Charged Dust and Plasma Layers in the Near-Earth Space Environment Using Ground-Based Ionospheric Heating Facilities
… Active Auroral Research Program<br />facility HAARP is presented in this work. These experiments have provided additional<br />quantitative interpretation of the SEE spectrum produced by MSBS to yield diagnostic measurements of the electron temperature in the heated ionosphere. SEE spectral …
-
Second Harmonic Generation Stimulated Electromagnetic Emissions during High Power High Frequency Radio Wave Interaction with the Ionosphere
… The heating experiments were all performed at HAARP using an O-mode polarized EM pump wave. Additionally, these measurements evaluate the effects on SHG of the transmit ERP, tilt of the transmit station antenna beam from the geomagnetic field (B0) and the offset of ω0 from nωce, n = 2, 3. The …