• 検索結果がありません。

MLT winds estimations obtained from specular and non-specular meteor trails at Jicamarca: Preliminary Results

N/A
N/A
Info
ダウンロード
Protected

Academic year: 2021

シェア "MLT winds estimations obtained from specular and non-specular meteor trails at Jicamarca: Preliminary Results"

Copied!
1
0
0

読み込み中.... (全文を見る)

今ダウンロードする ( 1 ページ )

全文

(1)

MLT winds estimations obtained from specular and non-specular meteor trails at Jicamarca: Preliminary Results

Danny SCIPION

(1)

, Julio OSCANOA

(2)

, and Marco MILLA

(1)

(1) Jicamarca Radio Observatory, Instituto Geofísico del Perú, Lima, Peru (2) Pontificia Universidad Católica del Perú, Lima, Perú.

Many non-specular meteors studies have been conducted with the high-power large- aperture (HPLA) radar at the Jicamarca Radio Observatory (JRO). Studies of interest are the ones that use the high-power meteor trails to estimate Mesosphere and Lower Thermosphere (MLT) winds (85-105 km) by combining 3 or more received signals using interferometry. The main limitation for obtaining the winds with this technique is the presence of the Equatorial ElectroJet (EEJ) particularly strong between 90-110 km.

Here, the authors present the preliminary results of a comparative study of MLT winds obtained from non-specular and specular meteor trails on a coordinated campaign conducted on the night of June 2

nd

- 3

rd

, 2016.

MLT winds using non-specular meteor trails were obtained by a combination of two modes for better comparison. The first method used the conventional interferometric approach, while the second method used 3 or 4 non-collinear beams to resolve the MLT winds by implementing the Doppler Beam Swinging (DBS) technique. These two approaches are susceptible by EEJ contamination in the meteor detection, so an additional time was devoted to the detection of the trails in the presence of EEJ.

MLT winds using specular meteor trails were obtained by the Jicamarca All-Sky METeor

system that operates at 30 MHz (JASMET 30) routinely since 2015. The specular condition of

the received echoes makes the system not susceptible to EEJ contamination. Estimates from

the specular meteors are obtained every hour with 2 km meter resolution, while estimates

from the non-specular meteors were obtained with high time (~15 minutes) and spatial

(~300 m) resolution.

参照

今ダウンロードする ( PDF - 1 ページ - 38.75 KB )

関連したドキュメント

Series solutions are obtained for the location of the free boundary and the price of the option in that limit

In the previous section, we revisited the problem of the American put close to expiry and used an asymptotic expansion of the Black-Scholes-Merton PDE to find expressions for

We show that the condition number of the preconditioned FETI-DP operator is proportional to , where and are mesh sizes

We present and analyze a preconditioned FETI-DP (dual primal Finite Element Tearing and Interconnecting) method for solving the system of equations arising from the mortar

1 Introduction and statement of the main results

Keywords: Convex order ; Fréchet distribution ; Median ; Mittag-Leffler distribution ; Mittag- Leffler function ; Stable distribution ; Stochastic order.. AMS MSC 2010: Primary 60E05

On the Nullity of Expanded Graphs

Many interesting graphs are obtained from combining pairs (or more) of graphs or operating on a single graph in some way. We now discuss a number of operations which are used

1. Introduction and Statement of the Main Results

Inside this class, we identify a new subclass of Liouvillian integrable systems, under suitable conditions such Liouvillian integrable systems can have at most one limit cycle, and

We observe that in the Besov space context, the results are applicable to the more familiar scale of periodic vector-valued H¨older spaces

We use operator-valued Fourier multipliers to obtain character- izations for well-posedness of a large class of degenerate integro-differential equations of second order in time

The radial symmetry of the first eigenfunctions are obtained for radial g, when Ω is a ball centered at the origin or RN

For p = 2, the existence of a positive principal eigenvalue for more general posi- tive weights is obtained in [26] using certain capacity conditions of Maz’ja [22] and in [30]

The obtained results are then used to show the correct solvability of a mixed problem for parabolic partial differential equation with non regular boundary conditions

In this paper, we study a problem for second order ordinary differential equation with mixed nonlocal boundary conditions combined weighting integral boundary conditions with