Efeitos de Explosões Solares na Baixa Ionosfera na Região da Anomalia Geomagnética do Atlântico Sul

Mara Lúcia V.J. Anzaloni, Vera Lúcia R. Kuntz

Abstract


Two different techniques were used to analyze comparatively the behaviour of the D-Region when solar flares occur. The first one uses an oblique LF/VLF lonossonde at 35 kHz and 45 kHz, located in the South Atlantic Geomagnetic Anomaly (SAGA) region, close to its central point. The second one uses long distance VLF propagation phase measurements at 16 kHz, crossing only part of the SAGA. Several parameters were analyzed, such as ionospheric reflection height, ionospheric ionization and recovery time, duration and the recombination coefficient for each event.

Solar flare ionization times appear to be larger for ionosonde data, compared to long distance propagation data. Recovery times and total durations are shorter for ionosonde data. Similar values of recombination coefficient are found for both techniques. However, the dependence of the recombination coefficient on the flare X-ray intensity is different for the two techniques


Keywords


explosões solares; baixa ionosfera; anomalia geomagnética; atlântico sul



DOI: http://dx.doi.org/10.22564/rbgf.v4i2.1043







 

>> Brazilian Journal of Geophysics - BrJG (online version): ISSN 2764-8044
a partir do v.37n.4 (2019) até o presente

Revista Brasileira de Geofísica - RBGf (online version): ISSN 1809-4511
v.15n.1 (1997) até v.37n.3 (2019)

Revista Brasileira de Geofísica - RBGf (printed version): ISSN 0102-261X
v.1n.1 (1982) até v.33n.1 (2015)

 

Brazilian Journal of Geophysics - BrJG
Sociedade Brasileira de Geofísica - SBGf
Av. Rio Branco 156 sala 2509
Rio de Janeiro, RJ, Brazil
Phone/Fax: +55 21 2533-0064
E-mail: editor@sbgf.org.br

Since 2022, the BrJG publishes all content under Creative Commons CC BY license. All copyrights are reserved to authors.

Creative Commons