ヴォイジャー2号によるウラヌスの無線観測

J W Warwick, D R Evans, J H Romig

Science (New York, N.Y.)

|July 4, 1986

まとめ

ボイジャー2号は,天王星からの多様な放射を検出し,磁場回転周期が17.24時間であることを明らかにしました. ラジオ信号の強度と帯域幅は,宇宙船に対する惑星の磁極方向と相関しています.

科学分野:

惑星科学は惑星科学である.
ラジオ天文学ラジオ天文学
マグネトヒドロダイナミクス

背景:

ヴォイジャー2号の惑星間ラジオ天文学実験は,天王星のラジオ放射に関するデータを収集した.
以前の研究では,天王星には複雑な磁場があることが示されていました.

研究の目的:

探査機ボイジャー2が天王星の近くで検出したラジオ放射を分析するために.
ウラノスの磁場の回転周期を決定する.
放射能とウランの磁気圏との関係を調査する.

主な方法:

ヴォイジャー2号の惑星ラジオ天文学実験を用いて,ラジオ放射の検出.
ローテーション期間を決定するために,排出量調節の分析.
電波の放射特性と磁場幾何学の相関.

主要な成果:

17.24 ± 0.01時間の独特のラジオ放射変調周期が特定され,これは天王星の磁場回転に対応しています.
ラジオ発射力と帯域幅は,より強い磁極が宇宙船に向かったときにピークに達した.
夜側半球に入ると,無線放射の帯域幅が大きく持続的に増加した.

結論:

天王星の磁場の回転周期は17.24時間です.
ウランの磁気圏は,ダイナミックな磁気水力ダイナミック現象を現しています.
電波の放射特性には,磁場構成と惑星の自転が大きく影響する.

さらに関連する動画

11:34

Scattering And Absorption of Light in Planetary Regoliths

Published on: July 1, 2019

10:35

Bringing the Visible Universe into Focus with Robo-AO

Published on: February 12, 2013

関連する概念動画

01:29

Kepler's Second Law of Planetary Motion

In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. His first law states that all planets orbit the Sun in an elliptical orbit, with the Sun at one of the ellipse's foci. Therefore, the distance of a planet from the Sun varies throughout its revolution around the Sun.
While in an elliptical orbit, the total energy of the planet is conserved. Therefore, the planet slows down when it is at apogee and...

01:10

Kepler's First Law of Planetary Motion

In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. He formulated his first two laws based on the observations of his forebears, Nikolaus Copernicus and Tycho Brahe.
Polish astronomer Nikolaus Copernicus put forth a theory that stated a heliocentric model for the solar system. According to this heliocentric theory, all the planets, including Earth, orbit the Sun in circular orbits.
On the other hand,...

01:05

Doppler Effect - II

The Doppler effect has several practical, real-world applications. For instance, meteorologists use Doppler radars to interpret weather events based on the Doppler effect. Typically, a transmitter emits radio waves at a specific frequency toward the sky from a weather station. The radio waves bounce off the clouds and precipitation and travel back to the weather station. The radio frequency of the waves reflected back to the station appears to decrease if the clouds or precipitation are moving...

01:18

Kepler's Third Law of Planetary Motion

In the early 17th century, German astronomer and mathematician Johannes Kepler postulated three laws for the motion of planets in the solar system. In 1909, he formulated his first two laws based on the observations of his forebears, Nikolaus Copernicus and Tycho Brahe. However, in 1918, he published his third law of planetary motion, which gives a precise mathematical relationship between a planet's average distance from the Sun and the amount of time it takes to revolve around the Sun. It...

01:02

Ultraviolet and Visible (UV–Vis) Spectroscopy: Overview

Ultraviolet–visible (UV–visible or UV–Vis) spectroscopy is an analytical technique that investigates the interaction between matter and UV–Vis light within the electromagnetic spectrum. This method is widely used for its versatility, simplicity, and relatively quick data acquisition, making it valuable for both qualitative and quantitative analysis. When UV–Vis radiation passes through a material, molecules absorb light depending on the energy required for electronic transitions. As a result...

00:56

Doppler Effect - I

The Doppler effect and Doppler shift were named after the Austrian physicist and mathematician Christian Johann Doppler in 1842, who conducted experiments with both moving sources and moving observers. Consider an observer standing on a street corner, observing an ambulance with a siren sound passing by at a constant speed. The observer experiences two characteristic changes in the sound of the siren. Initially, the sound increases in loudness as the ambulance approaches and decreases in...

関連する実験動画