Computer Science – Sound
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agusmsm33b..06c&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SM33B-06
Computer Science
Sound
2467 Plasma Temperature And Density, 2487 Wave Propagation (0689, 3285, 4275, 4455, 6934), 2704 Auroral Phenomena (2407), 2712 Electric Fields (2411), 2772 Plasma Waves And Instabilities (2471)
Scientific paper
Knowledge of auroral high-frequency waves is important because they provide a direct conduit for energy exchange between the auroral electron beam and the thermal electrons, and also because some of their energy is radiated away in EM radiation responsible for auroral radio emission such as auroral roar. Understanding of these processes will help us to understand analogous processes involving beam-plasma interactions throughout the solar system and beyond. From 1999 to 2003, five separate sounding rockets were launched from Poker Flat Rocket Range in Poker Flat, Alaska carrying high frequency electric field instruments provided by Dartmouth College as well as electron and ion particle detectors, DC and VLF Electric field detectors and other instruments depending on the particular rocket. Analysis of data from these rockets has been useful in contributing to the knowledge of auroral high-frequency waves, including providing high resolution full waveform measurements showing the structure of these waves. Although much has been gained by studying these rockets separately, there are certain outstanding questions concerning the origin and nature of these waves which cannot be answered with a single data set, rather requiring a comparison across data sets from rockets with different HF antenna orientation and spacing which flew to different apogees and encountered different ionospheric conditions. We categorize the observed signals as whistler mode, Z-mode, electron plasma waves (Langmuir waves) or upper hybrid waves based on the observed wave frequency relative to fpe and fce and the various wave cutoffs. We analyze occurrence, duration and in some cases intensity of signals in each of these categories received with the different antennas on the different rockets. Among the five data sets, the antennas are oriented in all directions from directly perpendicular to directly parallel to the earth's magnetic field and have spacings ranging from 30 cm to 6 m. The altitudes sampled by the wave observations range from about 300 km to about 950 km. Combining these data in matrix form and studying correlations between the wave measurements and antenna parameters or altitude of observation, in light of characteristics of the wave modes, such as wavelength, polarization, and collisional damping, will provide confirmation of the mode identifications as well as insight into the origin and nature of the different wave modes. In the future this analysis could be extended to include data from other instruments, for example measurements of electron and ion energies, densities, and other ionospheric parameters.
Colpitts C.
LaBelle James
No associations
LandOfFree
Complex Structure of Auroral High Frequency Waves: Comparing Data Sets from Five Separate Rocket Flights does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Complex Structure of Auroral High Frequency Waves: Comparing Data Sets from Five Separate Rocket Flights, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Complex Structure of Auroral High Frequency Waves: Comparing Data Sets from Five Separate Rocket Flights will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1027302