Year: 2024
Type: article
Abstract: Analysis of the ordinary mode (O‐mode) instability is performed to comprehend the nonthermal continuum (NTC) radiation near the plasmapause, taking into account the relativistic wave‐electron resonance effect. The energy source is the anisotropy in the velocity of the minority suprathermal electron population. Numerical solutions demonstrate that the O‐mode can be unstable with multiple narrow frequency bands located close to harmonics of the electron cyclotron frequency above the local electron plasma frequency. These waves have narrow beaming angle bands of nearly relative to the ambient magnetic field. Our findings indicate that NTC radiation generated by this wave‐electron resonance instability near the plasmapause can propagate nearer to the magnetic equator with multiple harmonics, which is in agreement with a recent statistical study using Van Allen Probes.
DOI: 10.1029/2024ja032626
Authors: Chio Z. Cheng, Eun‐Hwa Kim, Scott A. Boardsen, Iver H. Cairns, Jay R. Johnson
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
Estimated APC paid: $3,880
Awards: G180959178, G3131720517, THE SP SCIENCE CENTER WILL CARRY OUT OBSERVATIONAL EXPERIMENTAL AND THEORETICAL RESEARCH IN SUPPORT OF NASA STRATEGIC SCIENCE MISSION OBJECTIVES TO:A.SOLAR-PLANETARY SCIENCE: THE SUN GEOSPACE OTHER PLANETARY SPACE PLASMA ENVIRONMENTS AND THE INTERACTIONS AND COUPLINGS AMONG THESE PHYSICAL REGIMES;B.THE INFORMATIONAL AND COMPUTATIONAL SCIENCES RELATED TO THE UNIQUE NEEDS OF DATA SYSTEMS AND MODELS REQUIRED TO INTERPRET DATA FROM HELIOPHYSICS SCIENCE MISSIONS; ANDC.THE DEVELOPMENT OF INSTRUMENT TECHNOLOGY AND THEORETICAL TECHNIQUES REQUIRED TO MEET THESE SCIENTIFIC CHALLENGES.THIS COOPERATIVE AGREEMENT WILL ALLOW SUBSTANTIAL PROGRAMMATIC INVOLVEMENT IN THE FORM OF COLLABORATION BETWEEN GSFC AND THE SOLAR-PLANETARY SCIENCE CENTER AS WELL AS JOINT DEVELOPMENT OF RESEARCH OBJECTIVES.THE PRIMARY GOAL UNDER THE RESULTING COOPERATIVE AGREEMENT IS TO ESTABLISH A FOCUSED GSFC/RESEARCH PARTNERSHIP THAT:A.BRINGS TOGETHER THE SP SCIENCE CENTER AND GSFC SCIENTISTS TO IMPLEMENT THE NASA STRATEGIC GOALS IN HELIOPHYSICS SCIENCE;B.ENHANCES THE CAPABILITIES AND STRENGTHS OF PARTICIPATING ORGANIZATIONS IN HELIOPHYSICS SCIENCE;C.PROVIDES ORGANIZATION AND STAFFING FLEXIBILITY TO ADAPT TO EVOLVING RESEARCH PROGRAM NEEDS;D.ATTRACTS SUPERIOR SCIENTISTS NECESSARY TO CARRY OUT PROGRAMS WHICH WOULD BE OUTSIDE THE CAPABILITIES OF EITHER PARTNER WORKING ALONE;E.PROMOTES THE INVOLVEMENT OF MINORITY AND WOMEN SCIENTISTS IN SPACE SCIENCE RESEARCH; ANDF.FACILITATES ACCESS TO STUDENT TALENT AND PROVIDES OPPORTUNITIES FOR THEIR PARTICIPATION IN NASA PROGRAMS.THE SP SCIENCE CENTER WILL FOCUS PRIMARILY ON SCIENTIFIC RESEARCH. IT IS EXPECTED TO STRENGTHEN COOPERATIVE RELATIONSHIPS BETWEEN THE PARTNER INSTITUTION AND GOVERNMENT SCIENTISTS IN THE GODDARD HELIOPHYSICS SCIENCE DIVISION (HSD) AND WILL PROVIDE A VEHICLE TO INCREASE THE INVOLVEMENT OF THE EXTERNAL SCIENCE COMMUNITY IN THE PURSUIT OF NASA GOALS. THE SP SCIENCE CENTER WILL CONDUCT RESEARCH COLLABORATIVELY WITH ORGANIZATIONAL ELEMENTS WITHIN THE GODDARD HSD (CODE 670). RESEARCH MAY INVOLVE ANALYSIS OF DATA FROM OPERATING AND PAST MISSIONS AND MODELING AND DESIGN OF MISSIONS PLANNED OR UNDER DEVELOPMENT. FUTURE RESEARCH ACTIVITIES WILL EVOLVE AS A FUNCTION OF PRIORITIES BUDGETS FUNDING OPPORTUNITIES AND SUCCESS OF PROPOSAL SUBMISSIONS., G3375501697, G4175201840, G4896746546, G498139845, G516483051, G586700770, G5971281189, G6052105518, G6213261324, G663282964, G753517322, Collaborative Research: GEM--Radiation Belt Losses Using Combined Global Hybrid and Test Particle Simulations, G969889393
OpenAlex ID: W4403147458