関連する実験動画
Updated: Jun 29, 2026

11:34
Scattering And Absorption of Light in Planetary Regoliths
Published on: July 1, 2019
表面磁気による太陽の表面積の大きな過剰
Martin D Fivian1, Hugh S Hudson, Robert P Lin
1Space Sciences Laboratory, University of California-Berkeley, Berkeley, CA 94720, USA. mfivian@ssl.berkeley.edu
まとめ
太陽は太陽である.
科学分野:
- 太陽物理 太陽物理学
- 天文学 天文学
- ヘリオフィジックス ヘリオフィジックス
背景:
- 太陽の形状は,太陽の回転と内部動力学の影響を受けます.
- 表面の回転は,特定の太陽の傾斜度 (赤道と極の半径の差) を予測する.
- 以前の観測は,予測された高さと観測された高さとの間の不一致を示唆した.
研究 の 目的:
- 太陽の傾斜の不一致を調査するために.
- 高度度測定における体系的な誤りを特定し,修正する.
- 磁気効果がない場合の太陽の傾きを判別する.
主な方法:
- Reuven Ramaty High-Energy Solar Spectroscopic Imager (RHESSI) 衛星からのデータを活用した.
- 太陽の四肢の位置と極紫外線 (EUV) の明るさとの相関を分析した.
- ソーラーネットワークの磁気要素を考慮して,高さ測定を修正しました.
主要な成果:
- 観測された太陽の平らさは,表面の回転だけで予測されるよりも高かった.
- 強力な相関が,四肢の明るさと,より大きな半径の値,磁気活動に関連して見つかりました.
- 非磁性太陽の修正された高さ値は8.01 +/- 0.14ミリ弧秒でした.
結論:
- 観測された過剰な平らさは,主に磁気の影響によるものです.
- 磁気効果を補正した後,太陽の傾斜度は,その回転からの予測と一致します.
- この研究は,太陽の形状とその内部プロセスと磁場との関係に関する私たちの理解を洗練します.
関連する概念動画
Potential Due to a Magnetized Object
Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
The vector...
Variation in Acceleration due to Gravity near the Earth's Surface
An object's apparent weight is its weight measured by a spring balance at its location. It is different from its true weight, the force with which the Earth pulls it, because of the Earth's rotation. Mathematically, an object's apparent weight equals its true weight minus the centripetal force that keeps it in a circular motion along with the Earth's surface every 24 hours.
The difference between the true and apparent weights is proportional to the square of the Earth's angular speed. Since the...
The difference between the true and apparent weights is proportional to the square of the Earth's angular speed. Since the...
Apparent Weight and the Earth's Rotation
Since all objects on the Earth's surface move through a circle every 24 hours, there must be a net centripetal force on each object, directed towards the center of that circle. The points of the north and south poles are the only exception to this rule.
For an object on the Earth's equator, the net centripetal force that accounts for its rotation is the Earth's pull towards its center, or the weight minus the normal force that prevents it from piercing into the Earth's surface. This force,...
For an object on the Earth's equator, the net centripetal force that accounts for its rotation is the Earth's pull towards its center, or the weight minus the normal force that prevents it from piercing into the Earth's surface. This force,...
Magnetic Flux
The magnetic flux measures the number of magnetic field lines passing through a given surface area. The SI unit for magnetic flux is the weber (Wb). Magnetic flux is a scalar quantity. It depends on three factors: the strength of the magnetic field B, the area through which the field lines pass, and the relative orientation of the field with the surface area.
Suppose a surface is divided into elements of area dA. For each element, the component of the magnetic field that is normal to the...
Suppose a surface is divided into elements of area dA. For each element, the component of the magnetic field that is normal to the...
Magnetism
Magnets are commonly found in everyday objects, such as toys, hangers, elevators, doorbells, and computer devices. Experimentation on these magnets shows that all magnets have two poles: one is labeled north (N) and the other south (S). Magnetic poles repel if they are alike and attract if unlike. Moreover, both poles of a magnet attract unmagnetized pieces of iron.
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
An individual magnetic pole cannot be isolated. No matter how small, every piece of a magnet contains a north pole and a south...
Magnetic Declination
Magnetic declination is the angle between true north, which aligns with the Earth's rotational axis, and magnetic north, which follows the direction of the Earth's magnetic field. This discrepancy exists because the magnetic poles do not coincide with the geographic poles. The value of magnetic declination depends on the observer's location on Earth and is subject to changes over time due to the dynamic nature of the Earth's magnetic field.The declination is called eastern when magnetic north...
