Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Heating and Cooling Curves

Heating and Cooling Curves

When a substance—isolated from its environment—is subjected to heat changes, corresponding changes in temperature and phase of the substance is observed; this is graphically represented by heating and cooling curves.
For instance, the addition of heat raises the temperature of a solid; the amount of heat absorbed depends on the heat capacity of the solid (q = mcsolidΔT). According to thermochemistry, the relation between the amount of heat absorbed or released by a substance, q, and its...

Quantifying Heat

Quantifying Heat

Thermal Energy Microscopically, thermal energy is the kinetic energy associated with the random motion of atoms and molecules. Temperature is a quantitative measure of “hot” or “cold”, which depends on the amount of thermal energy. When the atoms and molecules in an object are moving or vibrating quickly, they have a higher average kinetic energy (KE) (or higher thermal energy), and the object is perceived as “hot”, or it is described as being at a higher temperature. When the...

Mechanisms of Heat Transfer II

Mechanisms of Heat Transfer II

In convection, thermal energy is carried by the large-scale flow of matter. Ocean currents and large-scale atmospheric circulation, which result from the buoyancy of warm air and water, transfer hot air from the tropics toward the poles and cold air from the poles toward the tropics. The Earth’s rotation interacts with those flows, causing the observed eastward flow of air in the temperate zones. Convection dominates heat transfer by air, and the amount of available space for the airflow...

Heat Flow and Specific Heat

Heat Flow and Specific Heat

Heat is a type of energy transfer that is caused by a temperature difference, and it can change the temperature of an object. Since heat is a form of energy, its SI unit is the joule (J). Another common unit of energy often used for heat is the calorie (cal), which is defined as the energy needed to change the temperature of 1 g of water by 1 °C, specifically between 14.5 °C and 15.5 °C, since the energy needed shows a slight temperature dependence. Another commonly used unit is...

Mechanisms of Heat Transfer I

Mechanisms of Heat Transfer I

Just as interesting as the effects of heat transfer on a system are the methods by which the heat transfer occur. Whenever there is a temperature difference, heat transfer occurs. It may occur rapidly, such as through a cooking pan, or slowly, such as through the walls of a picnic ice box. So many processes involve heat transfer that it is hard to imagine a situation where no heat transfer occurs. Yet, every heat transfer takes place by only three methods: conduction, convection, and radiation.

Mechanisms of Heat Transfer

Mechanisms of Heat Transfer

Heat transfer between the human body and its environment occurs through four main mechanisms: conduction, convection, radiation, and evaporation.
Conduction, accounting for approximately 3% of body heat loss at rest, is the process of exchanging heat between molecules of two materials in direct contact. This can result in both heat loss and gain. For instance, when the body is submerged in water, which conducts heat 20 times more effectively than air, it can either lose or gain significant...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Defining the Middle Corona.

Solar physics·2023

Same author

On Differentiating Multiple Types of ULF Magnetospheric Waves in Response to Solar Wind Periodic Density Structures.

Journal of geophysical research. Space physics·2022

Same author

Nine Outstanding Questions of Solar Wind Physics.

Journal of geophysical research. Space physics·2020

See all related articles

Search research articles

Related Experiment Video

Updated: Dec 31, 2025

Author Spotlight: Computing the Effects of a Local Radiofrequency Hyperthermia Intervention on Tumor Biomechanics

Author Spotlight: Computing the Effects of a Local Radiofrequency Hyperthermia Intervention on Tumor Biomechanics

Published on: December 1, 2023

Understanding Heating in Active Region Cores through Machine Learning. I. Numerical Modeling and Predicted

W T Barnes^1,2,3, S J Bradshaw¹, N M Viall⁴

¹Department of Physics & Astronomy, Rice University, Houston, TX 77005-1827, USA.

The Astrophysical Journal

|January 11, 2020

Summary

This summary is machine-generated.

This study models solar active region emission to understand energy deposition. Lower frequency nanoflares result in narrower emission measure slopes and more coherent time lags, aiding in solar corona heating studies.

Keywords:

Sun: UV radiation Sun: corona hydrodynamics methods: numerical

More Related Videos

Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere

Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere

Published on: April 30, 2018

Surrogate Model Development for Digital Experiments in Welding

Surrogate Model Development for Digital Experiments in Welding

Published on: March 28, 2025

Related Experiment Videos

Last Updated: Dec 31, 2025

Author Spotlight: Computing the Effects of a Local Radiofrequency Hyperthermia Intervention on Tumor Biomechanics

Author Spotlight: Computing the Effects of a Local Radiofrequency Hyperthermia Intervention on Tumor Biomechanics

Published on: December 1, 2023

Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere

Near-Infrared Temperature Measurement Technique for Water Surrounding an Induction-heated Small Magnetic Sphere

Published on: April 30, 2018

Surrogate Model Development for Digital Experiments in Welding

Surrogate Model Development for Digital Experiments in Welding

Published on: March 28, 2025

Area of Science:

Solar physics
Plasma astrophysics
Magnetohydrodynamics

Background:

Understanding energy deposition in solar active regions is crucial for solar corona physics.
Systematic comparisons between models and observations are needed to constrain heating frequencies.

Purpose of the Study:

To develop a forward modeling pipeline for active region emission.
To predict time-dependent emission for different nanoflare frequencies.
To analyze common diagnostics (emission measure slope, time lag) for signatures of heating frequency.

Main Methods:

Utilized magnetic field extrapolations and field-aligned hydrodynamic models.
Simulated emission from active region NOAA 1158 for low, intermediate, and high-frequency nanoflares.
Computed emission measure slope and time lag in predicted multi-wavelength, time-dependent images.

Main Results:

Heating frequency signatures were found in both emission measure slope and time lag diagnostics.
Emission measure slope distribution narrows and mean decreases with decreasing heating frequency.
Time lag becomes more spatially coherent with decreasing heating frequency and broader across the region with increasing frequency.

Conclusions:

The developed pipeline successfully predicts observable diagnostics sensitive to nanoflare heating frequency.
Results provide a basis for classifying real solar observations using these diagnostics.
This work contributes to understanding energy transport and deposition mechanisms in the solar corona.