SATELLITE-OBSERVATIONS OF ZONAL ELECTRIC-FIELDS NEAR SUNRISE IN THE EQUATORIAL IONOSPHERE

被引：25

作者：

AGGSON, TL ^{[1
]}

HERRERO, FA ^{[1
]}

JOHNSON, JA ^{[1
]}

PFAFF, RF ^{[1
]}

LAAKSO, H ^{[1
]}

MAYNARD, NC ^{[1
]}

MOSES, JJ ^{[1
]}

机构：

[1] MISSION RES CORP, NASHUA, NH USA

来源：

JOURNAL OF ATMOSPHERIC AND TERRESTRIAL PHYSICS | 1995年 / 57卷 / 01期

关键词：

D O I：

10.1016/0021-9169(93)E0013-Y

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

We report here on a number of examples of anomalous enhancements of eastward electric fields near sunrise in the equatorial ionospheric F-region. These examples were selected from the data base of the equatorial satellite, San Marco D (1988), which measured ionospheric electric fields during a period of solar minimum. The eastward electric fields reported correspond to vertical plasma drifts. The examples studied here are similar in signature and polarity to the pre-reversal electric field enhancements seen near sunset from ground-based radar systems. The morphology of these sunrise events, which are observed on about 14% of the morning-side satellite passes, are studied as a function of local zonal velocity, magnetic activity, geographic longitude and altitude. The nine events studied occur at locations where the zonal plasma flow is generally measured to be eastward, but reducing as a function of local time and at satellite longitudes where the magnetic declination has the opposite polarity as the declination of the sunrise terminator.

引用

页码：19 / 24

页数：6

共 11 条

[1] MAGNETIC-DECLINATION CONTROL OF THE EQUATORIAL F-REGION DYNAMO ELECTRIC-FIELD DEVELOPMENT AND SPREAD-F [J].