Comparative analysis of extreme ultraviolet solar radiation proxies during minimum activity levels  

作　　者：A.G.Elias C.R.Martinis B.F.de Haro Barbas F.D.Medina B.S.Zossi M.Fagre T.Duran 

机构地区：[1]Laboratorio de Ionosfera,Atmosfera Neutra y Magnetosfera,Facultad de Ciencias Exactas y Tecnologia(FACET),Universidad Nacional de Tucuman(UNT),Tucuman 4000,Argentina [2]Instituto de Física del Noroeste Argentino,Consejo Nacional de Investigaciones Cientificas y Tecnicas(CONICET)-UNT,Tucuman 4000,Argentina [3]Center for Space Physics,Astronomy Department,Boston University,MA 02215,USA [4]CONICET,Tucuman 4000,Argentina [5]Laboratorio de Telecomunicaciones,Departamento de Electricidad,Electrónica y Computación,FACET,UNT,Tucuman,4000,Argentina [6]Departamento de Física,Universidad Nacional del Sur(UNS),Bahia Blanca 8000,Argentina [7]Instituto de Física del Sur,CONICET-UNS,Bahia Blanca 8000,Argentina

出　　处：《Earth and Planetary Physics》2023年第5期540-547,共8页地球与行星物理（英文版）

基　　金：Research Project Numbers PIUNT E642 and PIP 2957;supported by National Science Foundation Grant Number AGS-2152365

摘　　要：Four extreme ultraviolet(EUV)solar radiation proxies(Magnesium II core-to-wing ratio(MgII),Lymanαflux(Fα),10.7-cm solar radio flux(F10.7),and sunspot number(Rz))were analyzed during the last four consecutive solar activity minima to investigate how they differ during minimum periods and how well they represent solar EUV radiation.Their variability within each minimum and between minima was compared by considering monthly means.A comparison was also made of their role in filtering the effect of solar activity from the critical frequency of the ionospheric F2 layer,foF2,which at mid to low latitudes depends mainly on EUV solar radiation.The last two solar cycles showed unusually low EUV radiation levels according to the four proxies.Regarding the connection between the EUV“true”variation and that of solar proxies,according to the foF2 filtering analysis,MgII and Fαbehaved in a more stable and suitable way,whereas Rz and F10.7 could be overestimating EUV levels during the last two minima,implying they would both underestimate the inter-minima difference of EUV when compared with the first two minima.

关 键 词：solar EUV radiation solar minimum FOF2 solar activity solar EUV proxy 

分 类 号：P422.1[天文地球—大气科学及气象学]