AI 中文总结
该研究提出MegaWave射电探测器概念，借助天基干涉仪开辟低射电频率观测窗口，以解决天体物理等领域的多个关键科学问题，契合相关研究计划，具备变革性观测能力。
AI 中文摘要
天体物理学、系外行星学、天体生物学和宇宙学领域的多个十年级科学问题，只能通过地球无法观测到的低射电频率来解决。MegaWave射电探测器将借助天基干涉仪，开辟这个尚未充分探索的电磁频谱区域，其科学目标包括：（1）追踪其他恒星的空间天气；（2）探测系外行星的磁致辐射，以研究其内部结构并评估其大气的磁屏蔽作用；（3）通过高红移氢原子超精细线探测宇宙黑暗时代的演化；（4）评估宇宙射线和磁场在宇宙网中的作用。作为天体物理学战略技术与研究加速器（ASTRA）计划的概念，MegaWave射电探测器的科学目标契合《发现之路十年调查》及美国国家科学院的另外三项研究，将作为《持久探索、大胆愿景》路线图中的形成期任务。美国航天产业的发展使该观测站得以实现，其架构通用、可扩展且具备韧性，能在45 MHz以下频率进行高灵敏度同时观测，并在该频段实现前所未有的角分辨率。该概念基于NASA的太阳射电干涉空间实验（SunRISE）、恒星-行星活动研究立方卫星（SPARCS）和月球表面电磁实验（LuSEE-Night）构建，可利用阿尔忒弥斯计划的多项资源，如进入地月空间及更远处的通道、通信支持，还有机会引入新的自主/人工智能模式用于任务运行。通过打开电磁频谱的最后一扇窗口之一，并开创前所未有的空间干涉测量规模，MegaWave射电探测器将建立起变革性的能力。
英文摘要
Several Decadal-level questions in astrophysics, exoplanets, astrobiology, and cosmology can be addressed only at low radio frequencies inaccessible from Earth. The MegaWave Radio Surveyor would open this largely-unexplored region of the electromagnetic spectrum with a space-based interferometer to (1)~Track the space weather of other stars; (2)~Detect magnetically-generated emission from exoplanets to probe their interiors and assess magnetic shielding of their atmospheres; (3)~Probe the Universe's evolution during the Dark Ages via the highly-redshifted HI hyperfine line; and (4)~Assess the role of cosmic rays and magnetic fields in the cosmic web. An Astrophysics Strategic Technology & Research Accelerator (ASTRA) Initiative concept, the MegaWave Radio Surveyor's science objectives respond to the Pathways to Discovery Decadal Survey and three other National Academies studies, and it would serve as a Formative Era mission in the Enduring Quests, Daring Visions roadmap. Developments in U.S. space industries enable this observatory to be realized. The MegaWave Radio Surveyor would offer a versatile, scalable, and resilient architecture capable of sensitive and simultaneous observations below 45~MHz and unprecedented angular resolution at these frequencies. The concept builds upon NASA's Sun Radio Interferometer Space Experiment (SunRISE), Star-Planet Activity Research CubeSat (SPARCS), and Lunar Surface Electromagnetics Experiment (LuSEE-Night). The MegaWave Radio Surveyor could leverage multiple elements of the Artemis program, such as access to and beyond cislunar space and communications, and there are opportunities to infuse new autonomy/AI modes for mission operations. By opening one of the last windows in the electromagnetic spectrum and pioneering space interferometry at unprecedented scales, the MegaWave Radio Surveyor would establish a transformational capability.
Comments20 pages, 8 figures; expanded NASA ASTRA concept description to provide a broader view of the science case; to be submitted to the Bulletin of the American Astronomical Society (BAAS); abstract abridged; acknowledgements updated
