Title
A Study on Meteor Head Echo Using a Probabilistic Detection Model at Jicamarca
Date Issued
01 January 2020
Access level
open access
Resource Type
journal article
Publisher(s)
Blackwell Publishing Ltd
Abstract
A coded long pulse is applied to the Jicamarca 50 MHz high power large aperture radar to study meteor head echoes. We develop a probabilistic detection model, which finds 25% more meteors than the commonly used signal-to-noise threshold method. The long code and the probabilistic approach allow us to detect over 180 meteors per minute during the dawn hours, which is several times higher than reported previously. The typical mass of the meteoroids is estimated to be about 10−9 kg, slightly smaller than other sensitive very-high-frequency and ultrahigh-frequency high power large aperture radars except the Arecibo radar. The high sensitivity allows us to observe numerous meteors in the presence of the strongest equatorial electrojet. We report and discuss the characteristics of meteor flux rate, ablation height, and velocity with a constant noise power for the first time for the Jicamarca radar. The highest average detection height is found to be near 2 a.m., instead of near 6 a.m. when the largest average velocity is observed. This is likely due to the combination of the relative large atmospheric velocity and the substantial atmospheric entry angles around 2 a.m. The observed characteristics suggest that many meteors are detected 8° off zenith despite that the full beam width is only 2.4°.
Volume
125
Issue
1
Language
English
OCDE Knowledge area
Meteorología y ciencias atmosféricas
Scopus EID
2-s2.0-85081355042
Source
Journal of Geophysical Research: Space Physics
ISSN of the container
21699380
Sponsor(s)
The Jicamarca Radio Observatory is a facility of the Instituto Geofisico del Peru and is operated with support from a NSF cooperative agreement through Cornell University. The study is supported by NSF Grant AGS-1744033 to Miami University. The raw data used for the analysis can be obtained from the Madrigal database at Jicamarca Radio Observatory (http://jro.igp.gob.pe/madrigal/).
Sources of information: Directorio de Producción Científica Scopus