Time correlation of low-altitude relativistic trapped electron fluxes with solar wind speeds
| dc.contributor.author | Fung, Shing F. | |
| dc.contributor.author | Tan, Lun C. | |
| dc.date.accessioned | 2021-07-30T17:20:19Z | |
| dc.date.available | 2021-07-30T17:20:19Z | |
| dc.date.issued | 1998-07-01 | |
| dc.description.abstract | We present the results from a study of time correlation between the low-altitude relativistic trapped electron fluxes and the solar wind speeds. Our trapped electron observations in the energy range of 0.19–3.2 MeV were obtained by the OHZORA spacecraft in an altitude range of 350–850 km, near a solar minimum period (1984–87). The solar wind data with a 5-minute time resolution were obtained from IMP-8 observations. Linear correlation analyses between the two data sets have been performed for relative time lags varying from 12 minutes to 60 days. The 2.5–day, 13-day, 27-day and 54-day correlation peaks previously reported for energetic electrons near geosynchronous orbits are clearly seen in our results. However, the use of higher time resolution solar wind data than in previous studies allows correlation analyses to be performed at shorter time lags. We report here that correlation at shorter time lags (<10 hrs) exists and that while such correlation is stronger than those observed at longer lag times, it can not be entirely attributed to storm or substorm injections. The correlation is also found to decrease with drift shell magnetic equatorial radii, rt. In addition, local-time and radial variations in the responses of different drift shells to solar wind speed enhancements indicate that the energetic electron population enters the inner magnetosphere predominantly through the midnight sector. | en_US |
| dc.description.sponsorship | We thank the NASA National Space Science Data Center (NSSDC) for providing the OHZORA and IMP-8 data used in this study. We are also indebted to Dr. T. Kohno and K. Nagata for archiving their HEP data from OHZORA at the NSSDC. Work by L. C. Tan at RSTX was supported by NASA contract NAS5-97059. | en_US |
| dc.description.uri | https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/98GL01717 | en_US |
| dc.format.extent | 4 pages | en_US |
| dc.genre | journal articles | en_US |
| dc.identifier | doi:10.13016/m2y4b1-pev9 | |
| dc.identifier.citation | Fung, Shing F.; Tan, Lun C.; Time correlation of low-altitude relativistic trapped electron fluxes with solar wind speeds; Geophysical Research Letters, 25, 13, p 2361-2364, 1 July, 1998; https://doi.org/10.1029/98GL01717 | en_US |
| dc.identifier.uri | https://doi.org/10.1029/98GL01717 | |
| dc.identifier.uri | http://hdl.handle.net/11603/22227 | |
| dc.language.iso | en_US | en_US |
| dc.publisher | American Geophysical Union | en_US |
| dc.relation.isAvailableAt | The University of Maryland, Baltimore County (UMBC) | |
| dc.relation.ispartof | UMBC Goddard Planetary Heliophysics Institute (GPHI) | |
| dc.rights | This item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author. | |
| dc.rights | Public Domain Mark 1.0 | * |
| dc.rights | This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law. | |
| dc.rights.uri | http://creativecommons.org/publicdomain/mark/1.0/ | * |
| dc.title | Time correlation of low-altitude relativistic trapped electron fluxes with solar wind speeds | en_US |
| dc.type | Text | en_US |