@MastersThesis{MelendezMoreno:1997:ExSoDe,
author = "Melendez Moreno, Jorge Luis",
title = "Explos{\~o}es solares decim{\'e}tricas tipo III associadas com a
fase impulsiva do {"}flare{"} solar",
school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
year = "1997",
address = "Sao Jose dos Campos",
month = "1997-02-20",
keywords = "explos{\~o}es solares, espetr{\'o}grafos, solar flares,
spectrograph.",
abstract = "As explos{\~o}es decim{\'e}tricas tipo III s{\~a}o geradas
pr{\'o}ximas a regi{\~a}o de acelera{\c{c}}{\~a}o das
part{\'{\i}}culas e de libera{\c{c}}{\~a}o de energia para os
{"}flares{"} na fase impulsiva. Portanto,
investiga{\c{c}}{\~o}es destas ajudam o conhecimento do processo
de acelera{\c{c}}{\~a}o. S{\~a}o analisados os espectros
din{\^a}micos de explos{\~o}es decim{\'e}tricas (100-3000 MHz)
detectadas em 13 flares pelo Radio Espectr{\'o}grafo PHOENIX
(Su{\'{\i}}{\c{c}}a). E feita a classifica{\c{c}}{\~a}o
destas explos{\~o}es em tipo III, {"}spike{"} e {"}patch{"}, e
apresentado um catalogo. A analise das explos{\~o}es tipo III
apresentou os seguintes resultados: a maioria das explos{\~o}es
tem menos do que 250 MHz de faixa de frequ{\^e}ncia; a
dura{\c{c}}{\~a}o a meia altura e dada por: t1/2 = 1.7 x 10^4
f-0.60; h{\'a} um decr{\'e}scimo do n{\'u}mero de
explos{\~o}es com o aumento da frequ{\^e}ncia e do fluxo; o
fluxo decresce para frequ{\^e}ncias maiores; das 160
explos{\~o}es analisadas, 102 casos (67) foram {"}reverse
slope{"} 52 casos (36) normais, e 8 casos (5) foram pares de
explos{\~o}es bi-direcionais; encontramos a seguinte
rela{\c{c}}{\~a}o entre taxa de deriva e frequ{\^e}ncia:
(df/dt) = 0.09 f1.35; a velocidade m{\'e}dia do excitador das
explos{\~o}es tipo III {\'e} v_III = 0.16c; a emiss{\~a}o no
harm{\^o}nico e predominante na faixa decim{\'e}trica; a
densidade num{\'e}rica media (n_b) e o numero de el{\'e}trons
(N) para o feixe emissor s{\~a}o 6 x 10^4 cm -3 e N 6 x 10^31
el{\'e}trons, respectivamente; a regi{\~a}o de
acelera{\c{c}}{\~a}o pode apresentar densidades eletr{\^o}nicas
de n_e 10^9 - 10^11 cm^-3 , e estar localizada a alturas h 10^4 -
10^5 km acima da fotosfera; inferimos limites superiores para a
extens{\~a}o da regi{\~a}o de acelera{\c{c}}{\~a}o de h 400 -
4000 km e para a escala temporal de acelera{\c{c}}{\~a}o das
part{\'{\i}}culas de < 0.5 - 5 ms. Tamb{\'e}m e apresentado um
{"}software{"} para detec{\c{c}}{\~a}o e
classifica{\c{c}}{\~a}o preliminar de explos{\~o}es tipo III e
{"}spikes{"}, e {\'e} proposto o formato FITS para os dados
digitais do Espectr{\'o}grafo WDDHRS do INPE. ABSTRACT:
Decimetric type III bursts are generated near the region of the
particle acceleration and energy release for {"}flares{"}
impulsive phase. Therefore, these investigations help the
knowledge process acceleration. Sao analyzed the dynamic spectra
of decimetric bursts (100-3000 MHz ) 13 flares detected by radio
spectrograph PHOENIX (Switzerland). And made \\the
classification of these explosions in Type III , {"}spike{"} and
{"}patch{"}, and presented a catalog. The analysis of the type III
bursts presented the following results: most explosions have less
than 250 MHz frequency range, the duration at half height is given
by : t 1/2 = 1.7 x 10 f, there is a decrease in the number of
explosions with increasing frequency and flow, the flow decreases
for higher frequencies , from 160 bursts analyzed , 102 cases (67)
were {"}reverse slope{"} 52 cases (36) normal, and 8 cases (5)
pairs were explosions of bi - directional , we find the following
relationship between drift rate and frequency : (df/d ) = 0:09 f,
the average speed of the driver of explosions and type III = 0.16c
, the harmonic emission in the decimeter range and predominant ;
average numerical density ( ) and the number of electrons (N) for
the beam emitter are 6 x 10 x 6 cm and N 10 electrons,
respectively, and the region of acceleration can submit electronic
density n 10-10 cm and be located heights h 10 10 km above the
photosphere; infer upper limits for the extension of the region of
acceleration h 400-4000 miles and to the timescale of acceleration
of particles < 0.5 - 5 ms. Is also presented with a {"}software{"}
for detection and classification of primary type III bursts and
{"}spikes{"} ee proposed the FITS format for digital data
spectrograph WDDHRS INPE.",
committee = "Alves, Maria Virg{\'{\i}}nia (presidente) and Sawant, Hanumant
Shankar (orientador) and Srivastava, Nandita and Azevedo, Carlos
Augusto de",
copyholder = "SID/SCD",
englishtitle = "Decimetric solar type III bursts in association with impulsive
phase of solar flares",
label = "7826",
language = "pt",
pages = "125",
ibi = "6qtX3pFwXQZ3r59YCT/GUnNH",
url = "http://urlib.net/ibi/6qtX3pFwXQZ3r59YCT/GUnNH",
targetfile = "publicacao.pdf",
urlaccessdate = "2024, May 02"
}