Reference TypeJournal Article
Holder Codeisadg {BR SPINPE} ibi 8JMKD3MGPCW/3DT298S
Citation KeyMendonça:1962:IoElCo
AuthorMendonça, Fernando de
Resume Identifier8JMKD3MGP3W34M/3KLSB52
AffiliationComissão Nacional de Atividades Espaciais
TitleIonospheric electron content and variations measured by doppler shifts in satellite transmissions
JournalJournal of Geophysical Research
AbstractA method is derived for calculating ionospheric electron content by comparison of the Doppler shifts imparted to two harmonically related frequencies transmitted from a satellite. This Doppler method is applied in the analysis of many passages of the satellite Transit 2-A (1960η1) during the months of July through October 1960. The observations were made at Stanford, California, on the frequencies of 54 Mc/s and its sixth harmonic. Differences in the electron content of 25 per cent between two subionospheric points separated by as little as 1000 km were observed on several passages during magnetically quiet days. On some magnetically disturbed days these differences increased to over 50 per cent for the same separation. A very strong magnetic storm is shown to decrease the early-afternoon electron content to almost a normal nighttime value over the range of latitudes surveyed. Other less intense storms are observed to decrease the electron content to the north and to increase it to the south of the observer. The day-to-day variations of electron content at a given latitude on magnetically quiet days are observed to be about ±15 per cent from the mean; however, less frequently, variations as large as ±50 per cent were observed. Unlike the variations on the magnetically disturbed days, these variations did not seem to modify the horizontal gradients normally found.
Notesgoogle Acadêmico: 68
Web of Scince: 11
Type of Workjournal article
Size1550 KiB
Number of Files1
Last Update2019:
Metadata Last Update2019: {D 1962}
Document Stagecompleted
Is the master or a copy?is the master
e-Mail (login)
User Groupadministrator
Content TypeExternal Contribution
Document Stagenot transferred
Version Typepublisher
source Directory Contentthere are no files
agreement Directory Content
agreement.html 11/02/2016 16:07 1.0 KiB 
History2016-02-12 17:06:51 :: -> administrator :: 1962
2016-02-17 01:52:51 :: administrator -> :: 1962
2016-02-23 18:44:25 :: -> administrator :: 1962
2016-06-04 05:08:09 :: administrator -> :: 1962
2018-04-19 16:20:50 :: -> administrator :: 1962
2019-01-18 04:57:01 :: administrator -> :: 1962
Empty Fieldsalternatejournal archivingpolicy archivist callnumber copyholder copyright creatorhistory descriptionlevel dissemination electronicmailaddress format isbn issn keywords lineage mark nextedition nexthigherunit orcid parameterlist parentrepositories previousedition previouslowerunit progress project readergroup readpermission rightsholder secondarydate secondarykey secondarymark secondarytype session shorttitle sponsor subject targetfile tertiarymark tertiarytype url
Access Date2020, Aug. 14