Radial Evolution of Non-Maxwellian Electron Populations Derived from Quasi-thermal Noise Spectroscopy: Parker Solar Probe Observations
| dc.contributor.author | Zheng, X. | |
| dc.contributor.author | Liu, K. | |
| dc.contributor.author | Martinović, M.M. | |
| dc.contributor.author | Pierrard, V. | |
| dc.contributor.author | Klein, K.G. | |
| dc.contributor.author | Liu, M. | |
| dc.contributor.author | Abraham, J.B. | |
| dc.contributor.author | Liu, Y. | |
| dc.contributor.author | Luo, J. | |
| dc.contributor.author | Lin, X. | |
| dc.contributor.author | Liu, G. | |
| dc.contributor.author | Li, J. | |
| dc.date | 2024 | |
| dc.date.accessioned | 2024-12-04T13:39:15Z | |
| dc.date.available | 2024-12-04T13:39:15Z | |
| dc.identifier.uri | https://orfeo.belnet.be/handle/internal/13530 | |
| dc.description | Understanding the transport of energy within space plasmas, particularly in the solar wind, remains a complex challenge. Accurate measurement of electron temperatures and their nonthermal characteristics is crucial for comprehending energy transport properties in plasmas. Quasi-thermal-noise (QTN) spectroscopy has emerged as a dependable tool for precise electron parameters assessment as it is less susceptible to spacecraft effects than particle detectors. In this study, we apply a QTN spectroscopy fitting method to analyze data from the Parker Solar Probe FIELDS radio instrument obtained during Encounters 2 through 13, under unbiased antenna conditions. We use the kappa function to characterize the electron velocity distribution and employ a fitting technique to derive the changes in each parameter across heliocentric distances ranging from 12 Rs to 76 Rs. Specifically, we find that the electron density scales as ne ∝ r−2.09±0.04 and the Te ∝ r−0.65±0.02. The distribution of the kappa index has three distinct regions as a function of radial distance from the Sun. Furthermore, we conduct a statistical analysis of solar wind energy flux which we finds follows a power-law relationship wtotal ∝ r−1.92±0.04. | |
| dc.language | eng | |
| dc.title | Radial Evolution of Non-Maxwellian Electron Populations Derived from Quasi-thermal Noise Spectroscopy: Parker Solar Probe Observations | |
| dc.type | Article | |
| dc.subject.frascati | Physical sciences | |
| dc.audience | Scientific | |
| dc.source.title | The Astrophysical Journal | |
| dc.source.volume | 977 | |
| dc.source.issue | 1 | |
| dc.source.page | A39 | |
| Orfeo.peerreviewed | Yes | |
| dc.identifier.doi | 10.3847/1538-4357/ad7d05 | |
| dc.identifier.url |