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IJRSP Vol.40 [2011] >
IJRSP Vol.40(1) [February 2011] >
| Title: | Characteristics of type II solar radio bursts in the meter and deca-hectometer wavelengths |
| Authors: | Prakash, O
Umapathy, S
Shanmugaraju, A
Kalaivani, P Pappa
Ebenezer, E |
| Keywords: | Coronal mass ejection
Solar flare
Solar radio burst
Radio burst type II |
| Issue Date: | Feb-2011 |
| Publisher: | NISCAIR-CSIR, India |
| PACS No.: | 96.60.ph; 96.60.qe |
| Abstract: | A detailed investigation on type II radio bursts pairs in the meter and deca-hectometer
wavelength ranges (herein after m-and DH-type II bursts) and their associated flares
and CMEs observed during the period 2000-2005 has been presented. Out of 38
events, only 27 events have been selected, which are the CMEs following the
associated flares (AF-CMEs). The selected events are divided into two classes
using the drift plots: class I, where DH-type II bursts are not continuation of
m-type II bursts; and class II, where DH-type II bursts are extensions of
m-type II bursts. The study consists of: i)
properties of the m- and DH-type II bursts for class I and class II; and ii) characteristics of type II bursts and
their associated flares and CMEs. It has been found that there are significant
differences in class I and class II type II bursts pairs and they are
associated with flares and CMEs (duration, ending frequency, m-type II speed).
The class I m-type II bursts have speeds much slower than the class II events. The
correlation between the starting frequencies and flare start-CME onset delay
times of m- and DH-type II bursts has been found. Out of 27 type II bursts
pairs, 26% are associated with class I events, i.e. the DH-type II is not
continuous of m-type II burst, which is consistent with two types of coronal
shocks model. The remaining 74% of class II events (DH-type II bursts is
extension of m-type II bursts) are associated with single shocks model. From
these results, it is concluded that the class I type II bursts pairs (m- and
DH-type II bursts) tend to be related with flares and CMEs and class II events
tend to be related with CMEs. |
| Page(s): | 11-20 |
| CC License: |  CC Attribution-Noncommercial-No Derivative Works 2.5 India |
| ISSN: | 0975-105X (Online); 0367-8393 (Print) |
| Source: | IJRSP Vol.40(1) [February 2011]
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