%0 Journal Article
%4 dpi.inpe.br/plutao/2013/05.31.18.19.50
%2 dpi.inpe.br/plutao/2013/05.31.18.19.51
%@doi 10.1088/1742-6596/409/1/012186
%@issn 1742-6588
%F lattes: 1272123236892781 1 CorreiaMakhRaulMaki:2013:MiLoRe
%T Mid- and low-latitude response of the lower ionosphere to solar proton events on January 2012
%D 2013
%A Correia, Emilia,
%A Makhmutov, Vladimir S,
%A Raulin, Jean Pierre,
%A Makita, Kazuo,
%@affiliation Instituto Nacional de Pesquisas Espaciais (INPE)
%@affiliation Lebedev Physical Institute RAS, Moscow, Russia
%@affiliation CRAAM – Prebiterian Mackenzie University, SP, Brazil
%@affiliation Takushoku University, Tokio, Japan
%@electronicmailaddress ecorreia@craam.mackenzie.br
%B Journal of Physics: Conference Series
%V 409
%N 012186
%P 1-4
%K cosmic noise absorption, riometer, solar protons.
%X We present and discuss the ionosphere behavior under the impact of two X-ray solar flares (M8.7 and X1.7) that occurred on January 23 and 27, respectively, and were accompanied by Solar Proton Events (SPEs). The ionosphere response to these solar phenomena was detected using riometers (30 and 38.2 MHz), ionosonde and VLF systems operating at the Comandante Ferraz Brazilian Station in Antarctica and at the Itapetinga Radio Observatory in São Paulo (SP)/Brazil. The results suggest the ionosphere was affected by both SPEs, as evidenced by absorption detected in the cosmic noise, F2 layer critical frequency and VLF amplitude measurements. These absorptions started before the beginning of the main Xray flare events and > 100 MeV proton events detected by GOES, suggesting the ionosphere was impacted by protons with energies above 2 GeV in Antarctica and above 10-12 GeV in SP as estimated from the particle geomagnetic rigidity (Rc) at each place. The results also suggest a long-lasting presence (hours) of high energy protons.
%@language en
%3 1742-6596_409_1_012186.pdf
%U http://iopscience.iop.org/1742-6596/409/1/012186/
%O 23rd European Cosmic Ray Symposium, ECRS 2012 and 32nd Russian Cosmic Ray Conference; Moscow; Russian Federation; 3 July 2012 through 7 July 2012; Code 95792