Open Access. Powered by Scholars. Published by Universities.®
Physical Sciences and Mathematics Commons™
Open Access. Powered by Scholars. Published by Universities.®
- Keyword
-
- EMIC waves (2)
- EMIC (1)
- Electromagnetic ion cyclotron waves (1)
- Geomagnetic conjugacy (1)
- Geomagnetically induced currents (1)
-
- Injection (1)
- Isolated proton aurora (1)
- Magnetic perturbation events (1)
- Magnetic storms (1)
- Observational technique (1)
- Omega bands (1)
- Particle precipitation (1)
- Pc1 geomagnetic pulsations (1)
- Radiation belt (1)
- Ring current (1)
- Substorms (1)
- Wave particle interaction (1)
- Wave vector (1)
- Wave-particle interactions (1)
Articles 1 - 5 of 5
Full-Text Articles in Physical Sciences and Mathematics
Determining Emic Wave Vector Properties Through Multi-Point Measurements: The Wave Curl Analysis, S. K. Vines, B. J. Anderson, R. C. Allen, R. E. Denton, M. J. Engebretson, J. R. Johnson, S. Toledo-Redondo, J. H. Lee, D. L. Turner, R. E. Ergun, R. J. Strangeway, C. T. Russell, H. Wei, R. B. Torbert, S. A. Fuselier, B. L. Giles, J. L. Burch
Determining Emic Wave Vector Properties Through Multi-Point Measurements: The Wave Curl Analysis, S. K. Vines, B. J. Anderson, R. C. Allen, R. E. Denton, M. J. Engebretson, J. R. Johnson, S. Toledo-Redondo, J. H. Lee, D. L. Turner, R. E. Ergun, R. J. Strangeway, C. T. Russell, H. Wei, R. B. Torbert, S. A. Fuselier, B. L. Giles, J. L. Burch
Faculty Authored Articles
Electromagnetic ion cyclotron (EMIC) waves play important roles in particle loss processes in the magnetosphere. Determining the evolution of EMIC waves as they propagate and how this evolution affects wave-particle interactions requires accurate knowledge of the wave vector, k. We present a technique using the curl of the wave magnetic field to determine k observationally, enabled by the unique configuration and instrumentation of the Magnetospheric MultiScale (MMS) spacecraft. The wave curl analysis is demonstrated for synthetic arbitrary electromagnetic waves with varying properties typical of observed EMIC waves. The method is also applied to an EMIC wave interval observed by MMS …
Magnetic Conjugacy Of Pc1 Waves And Isolated Proton Precipitation At Subauroral Latitudes: Importance Of Ionosphere As Intensity Modulation Region, Mitsunori Ozaki, Kazuo Shiokawa, Richard B. Horne, Mark J. Engebretson, Marc Lessard, Yasunobu Ogawa, Keisuke Hosokawa, Masahito Nosé, Yusuke Ebihara, Akira Kadokura, Satoshi Yagitani, Yoshizumi Miyoshi, Shion Hashimoto, Shipra Sinha, Ashwini K. Sinha, Gopi K. Seemala, Chae Woo Jun
Magnetic Conjugacy Of Pc1 Waves And Isolated Proton Precipitation At Subauroral Latitudes: Importance Of Ionosphere As Intensity Modulation Region, Mitsunori Ozaki, Kazuo Shiokawa, Richard B. Horne, Mark J. Engebretson, Marc Lessard, Yasunobu Ogawa, Keisuke Hosokawa, Masahito Nosé, Yusuke Ebihara, Akira Kadokura, Satoshi Yagitani, Yoshizumi Miyoshi, Shion Hashimoto, Shipra Sinha, Ashwini K. Sinha, Gopi K. Seemala, Chae Woo Jun
Faculty Authored Articles
Pc1 geomagnetic pulsations, equivalent to electromagnetic ion cyclotron waves in the magnetosphere, display a specific amplitude modulation, though the region of the modulation remains an open issue. To classify whether the amplitude modulation has a magnetospheric or ionospheric origin, an isolated proton aurora (IPA), which is a proxy of Pc1 wave-particle interactions, is compared with the associated Pc1 waves for a geomagnetic conjugate pair, Halley Research Base in Antarctica and Nain in Canada. The temporal variation of an IPA shows a higher correlation coefficient (0.88) with Pc1 waves in the same hemisphere than that in the opposite hemisphere. This conjugate …
Nighttime Magnetic Perturbation Events Observed In Arctic Canada: 3. Occurrence And Amplitude As Functions Of Magnetic Latitude, Local Time, And Magnetic Disturbance Indices, Mark J. Engebretson, Viacheslav A. Pilipenko, Erik S. Steinmetz, Mark B. Moldwin, Martin G. Connors, David H. Boteler, Howard J. Singer, Hermann Opgenoorth, Audrey Schillings, Shin Ohtani, Jesper Gjerloev, Christopher T. Russell
Nighttime Magnetic Perturbation Events Observed In Arctic Canada: 3. Occurrence And Amplitude As Functions Of Magnetic Latitude, Local Time, And Magnetic Disturbance Indices, Mark J. Engebretson, Viacheslav A. Pilipenko, Erik S. Steinmetz, Mark B. Moldwin, Martin G. Connors, David H. Boteler, Howard J. Singer, Hermann Opgenoorth, Audrey Schillings, Shin Ohtani, Jesper Gjerloev, Christopher T. Russell
Faculty Authored Articles
Rapid changes of magnetic fields associated with nighttime magnetic perturbation events (MPEs) with amplitudes |ΔB| of hundreds of nT and 5–10 min duration can induce geomagnetically induced currents (GICs) that can harm technological systems. This study compares the occurrence and amplitude of nighttime MPEs with |dB/dt| ≥ 6 nT/s observed during 2015 and 2017 at five stations in Arctic Canada ranging from 64.7° to 75.2° in corrected geomagnetic latitude (MLAT) as functions of magnetic local time (MLT), the SME (SuperMAG version of AE) and SYM/H magnetic indices, and time delay after substorm onsets. Although most MPEs occurred within 30 min …
Measurement Report: Sulfuric Acid Nucleation And Experimental Conditions In A Photolytic Flow Reactor, David R. Hanson, Seakh Menheer, Michael Wentzel, Joan Kunz
Measurement Report: Sulfuric Acid Nucleation And Experimental Conditions In A Photolytic Flow Reactor, David R. Hanson, Seakh Menheer, Michael Wentzel, Joan Kunz
Faculty Authored Articles
Nucleation rates involving sulfuric acid and water measured in a photolytic flow reactor have decreased considerably over a time period of several years. Results show that the system flow reactor, gas supplies and lines, flow meters, valves, H2SO4 photo-oxidant sources has reached a baseline stability that yields nucleation information such as cluster free energies. The baseline nucleation rate is punctuated by temporary bursts that in many instances are linked to cylinder changes, delineating this source of potential contaminants. Diagnostics were performed to better understand the system, including growth studies to assess H2SO4 levels, chemiluminescent NO and NOx detection to assess …
Observations Of Particle Loss Due To Injection-Associated Electromagnetic Ion Cyclotron Waves, Hyomin Kim, Quintin Schiller, Mark J. Engebretson, Sungjun Noh, Ilya Kuzichev, Louis J. Lanzerotti, Andrew J. Gerrard, Khan Hyuk Kim, Marc R. Lessard, Harlan E. Spence, Dae Young Lee, Jürgen Matzka, Tanja Fromm
Observations Of Particle Loss Due To Injection-Associated Electromagnetic Ion Cyclotron Waves, Hyomin Kim, Quintin Schiller, Mark J. Engebretson, Sungjun Noh, Ilya Kuzichev, Louis J. Lanzerotti, Andrew J. Gerrard, Khan Hyuk Kim, Marc R. Lessard, Harlan E. Spence, Dae Young Lee, Jürgen Matzka, Tanja Fromm
Faculty Authored Articles
We report on observations of electromagnetic ion cyclotron (EMIC) waves and their interactions with injected ring current particles and high energy radiation belt electrons. The magnetic field experiment aboard the twin Van Allen Probes spacecraft measured EMIC waves near L = 5.5–6. Particle data from the spacecraft show that the waves were associated with particle injections. The wave activity was also observed by a ground-based magnetometer near the spacecraft geomagnetic footprint over a more extensive temporal range. Phase space density profiles, calculated from directional differential electron flux data from Van Allen Probes, show that there was a significant energy-dependent relativistic …