标题： 南极为25-300 MHz频段的电磁背景研究 显示英文标题

标题： Study of electromagnetic backgrounds in the 25-300 MHz frequency band at the South Pole

摘要： 广延大气簇射可以通过无线电表面探测器检测到的无线电波信号来探测。 一个有前景的主要辐射过程理论是在地球磁场中由正负电子簇射粒子发射的相干同步加速辐射（地磁同步加速辐射效应）。 一个无线电大气簇射探测器可以扩展IceTop，即IceCube顶部的大气簇射探测器。 这可能显著提高IceTop对更高簇射能量和倾斜簇射的灵敏度。 来自大气簇射的μ子是中微子望远镜IceCube的主要背景之一。 因此，一个地表无线电大气簇射探测器可以作为这种μ子背景的拒斥探测器。 2007年用单个天线进行的初步无线电背景测量揭示了一个连续的电磁背景，这表明无线电大气簇射探测具有较低的能量阈值。 然而，短脉冲的无线电干扰可能会模拟真实的信号，必须在感兴趣的频率范围内识别。 这些电磁背景的特性在2009年的南极冬季使用两种不同类型的地表天线进行了测量。 总共四个天线被放置在彼此相距最远达400米的位置。 2010年，一个小的八通道地表探测器将在南极雪地上测试一种基于大偶极天线的幅度阈值自触发策略。 安装过程将被描述。 显示英文摘要

摘要： Extensive air showers are detectable by radio signals with a radio surface detector. A promising theory of the dominant emission process is the coherent synchrotron radiation emitted by e+ e- shower particles in the Earth's magnetic field (geosynchrotron effect). A radio air shower detector can extend IceTop, the air shower detector on top of IceCube. This could increase the sensitivity of IceTop to higher shower energies and for inclined showers significantly. Muons from air showers are a major part of the background of the neutrino telescope IceCube. Thus a surface radio air shower detector could act as a veto detector for this muonic background. Initial radio background measurements with a single antenna in 2007 revealed a continuous electromagnetic background promising a low energy threshold of radio air shower detection. However, short pulsed radio interferences can mimic real signals and have to be identified in the frequency range of interest. These properties of the electromagnetic background was being measured at the South Pole during the Antarctic winter 2009 with two different types of surface antennas. In total four antennas are placed at distances ranging up to 400m from each other. In 2010 a small eight channel surface detector will test an amplitude threshold self trigger strategy with large dipole antennas on the South Pole snow ground. The installation will be described.