電波スペクトル

Double X-Class Solar Flares Paralyse Global Shortwave Radio

The Sun erupted with two massive X-class flares in less than seven hours, triggering widespread communication blackouts across four continents as Solar Cycle 25 nears its peak. 4月 24, 2026

Space

MeerKAT Snags a 'Mega‑Laser' 8 Billion Light‑Years Away — The Signal Is Real, but Not a Beacon

A bright, short radio burst—called a 'mega‑laser'—was detected by South Africa's MeerKAT and traced to a merging galaxy 8+ billion light‑years away. Astronomers say the signal is … 3月 23, 2026

Space

A Mysterious Radio Signal from Space Is Ticking Every 16 Days — And Astronomers Are Listening Closely

Astronomers have detected a mysterious radio signal from space that repeats on a 16.35‑day clock. The pattern — brief fast radio bursts arriving in a four‑day active window every … 3月 22, 2026

Science

Radio Survey Maps 13.7 Million Hidden Objects

A new LOFAR data release catalogs nearly 13.7 million radio sources across 88% of the northern sky, exposing black-hole jets, galaxy clusters, supernova remnants and other objects… 3月 13, 2026

Space Weather

SETI May Have Missed Alien Calls

New SETI research shows space weather can smear and hide narrow alien radio beacons, meaning signals could arrive looking like noise. Scientists want to broaden search methods and… 3月 12, 2026

Physics

Two Black Holes Photographed Together

Astronomers have published the first radio image that resolves two supermassive black holes orbiting each other at the heart of quasar OJ287, confirming a decades‑old prediction a… 2月 10, 2026

Space

Earth’s Magnetic Whispers

Spacecraft have recorded 'chirping' radio emissions far from Earth’s surface — a discovery that rewrites where and how magnetospheric waves form and raises fresh questions about s… 2月 07, 2026

Technology

China’s Smart Surface Aims to Turn Radar into Aircraft Power

A paper from Xidian University describes a reconfigurable metasurface that can switch between scattering and radiation modes and harvest ambient radar energy—an advance that could… 1月 05, 2026

Science

Secret SpaceX Satellites Emitting Wrong‑Way Signals

An amateur astronomer discovered that a fleet of classified SpaceX satellites is transmitting on uplink frequencies normally reserved for ground stations, raising questions about … 11月 21, 2025

電波スペクトル

Articles about 電波スペクトル

Double X-Class Solar Flares Paralyse Global Shortwave Radio

MeerKAT Snags a 'Mega‑Laser' 8 Billion Light‑Years Away — The Signal Is Real, but Not a Beacon

A Mysterious Radio Signal from Space Is Ticking Every 16 Days — And Astronomers Are Listening Closely

Radio Survey Maps 13.7 Million Hidden Objects

SETI May Have Missed Alien Calls

Two Black Holes Photographed Together

Earth’s Magnetic Whispers

China’s Smart Surface Aims to Turn Radar into Aircraft Power

Secret SpaceX Satellites Emitting Wrong‑Way Signals