The Medium-energy Electron Spectrometers(MES)is a space-borne instrument onboard Macao Science Satellite-1(MSS-1)dedicated to monitoring the typical charged particle radiation characteristics in the satellite orbit an...The Medium-energy Electron Spectrometers(MES)is a space-borne instrument onboard Macao Science Satellite-1(MSS-1)dedicated to monitoring the typical charged particle radiation characteristics in the satellite orbit and the process of their occurrence and development,including short bursts of lightning-induced electron precipitation(LEP).This paper presents the first results of the LEP measurements by the MSS-1.47 LEP events are identified with the routine operation for 3 months since satellite launch,all within the range of 1.5<L<3.0(where L represents the McIlwain L-parameter),and the causative lightning discharges are definitively geo-located for these LEP events.The LEP events occur within<1 s of the causative lightning and consist of 40–300 keV electrons.A preliminary observation result indicates that,with medium-energy electron detectors,MSS-1can present in-situ observations of large regions of enhanced background precipitation and reveal their fine spatiotemporal characteristics and spectral signatures.The collaborative VLF ground-based measurements at the Great Wall Station,Antarctica also have a good correspondence with LEP measurements of MSS-1.The observations also imply that lightning activity has a modulation effect on the energetic electron energy-spatial structure.展开更多
Particle bursts （PBs）, the phenomena characterized by short-term increases of particle counting rates （CRs）, were observed by space-borne radiation belt particle detectors. With the electron CR data obtained by Na...Particle bursts （PBs）, the phenomena characterized by short-term increases of particle counting rates （CRs）, were observed by space-borne radiation belt particle detectors. With the electron CR data obtained by National Oceanic and Atmospheric Ad- ministration （NOAA）-18 satellite, the occurrence of PBs in the inner belt （I〈~L〈2 and B〉20.5 gT） were derived for years 2006-2011. The monthly occurrence number of PBs exhibits a strong maximum in northern summer （May-August）. In associ- ation with global lightning data, the seasonal occurrence of PBs is found to be consistent with the lightning activity, especially if only lightning flashes at latitudes 〉20~ are taken into account. The positive correlation between PBs and mid-latitude light- ning discharges indicates the role of lightning-induced whistler waves, and is consistent with the expected pitch-angle scatter- ing by wave-particle interactions. The contribution of lightning is so significant that it forms a non-negligible seasonal back- ground of PBs. If one connects PBs to seismoelectromagnetic emissions （SEME） in attempt to find the earthquake precursor, the lightning background needs to be considered with great care.展开更多
基金the Chinese Meridian ProjectⅡthe Chinese National Antarctic Research Expedition for the support to the VLF wave detection program at GWS+2 种基金supported by the National Natural Science Foundation of China(Grant Nos.42230202,42130210)the National Key Research and Development Program of China(Grant Nos.2021YFA0718600,2023YFC808905)the Space Science Pilot Project of the Chinese Academy of Sciences(Grant No.XDA15350202)。
文摘The Medium-energy Electron Spectrometers(MES)is a space-borne instrument onboard Macao Science Satellite-1(MSS-1)dedicated to monitoring the typical charged particle radiation characteristics in the satellite orbit and the process of their occurrence and development,including short bursts of lightning-induced electron precipitation(LEP).This paper presents the first results of the LEP measurements by the MSS-1.47 LEP events are identified with the routine operation for 3 months since satellite launch,all within the range of 1.5<L<3.0(where L represents the McIlwain L-parameter),and the causative lightning discharges are definitively geo-located for these LEP events.The LEP events occur within<1 s of the causative lightning and consist of 40–300 keV electrons.A preliminary observation result indicates that,with medium-energy electron detectors,MSS-1can present in-situ observations of large regions of enhanced background precipitation and reveal their fine spatiotemporal characteristics and spectral signatures.The collaborative VLF ground-based measurements at the Great Wall Station,Antarctica also have a good correspondence with LEP measurements of MSS-1.The observations also imply that lightning activity has a modulation effect on the energetic electron energy-spatial structure.
基金supported by the National Basic Research Program of China("973" Project)(Grant Nos.2012CB957801,2011CB811405)the National Natural Science Foundation of China(Grant Nos.41274155,40904036)+1 种基金the Public Science and Technology Research Funds Projects of Ocean,State Oceanic Administration of China(Grant No.201005017)the Specialized Research Fund for State Key Laboratories
文摘Particle bursts （PBs）, the phenomena characterized by short-term increases of particle counting rates （CRs）, were observed by space-borne radiation belt particle detectors. With the electron CR data obtained by National Oceanic and Atmospheric Ad- ministration （NOAA）-18 satellite, the occurrence of PBs in the inner belt （I〈~L〈2 and B〉20.5 gT） were derived for years 2006-2011. The monthly occurrence number of PBs exhibits a strong maximum in northern summer （May-August）. In associ- ation with global lightning data, the seasonal occurrence of PBs is found to be consistent with the lightning activity, especially if only lightning flashes at latitudes 〉20~ are taken into account. The positive correlation between PBs and mid-latitude light- ning discharges indicates the role of lightning-induced whistler waves, and is consistent with the expected pitch-angle scatter- ing by wave-particle interactions. The contribution of lightning is so significant that it forms a non-negligible seasonal back- ground of PBs. If one connects PBs to seismoelectromagnetic emissions （SEME） in attempt to find the earthquake precursor, the lightning background needs to be considered with great care.
