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Title: ENERGY PARTITIONS AND EVOLUTION IN A PURELY THERMAL SOLAR FLARE

Abstract

This paper presents a solely thermal flare, which we detected in the microwave range from the thermal gyro- and free–free emission it produced. An advantage of analyzing thermal gyro emission is its unique ability to precisely yield the magnetic field in the radiating volume. When combined with observationally deduced plasma density and temperature, these magnetic field measurements offer a straightforward way of tracking evolution of the magnetic and thermal energies in the flare. For the event described here, the magnetic energy density in the radio-emitting volume declines over the flare rise phase, then stays roughly constant during the extended peak phase, but recovers to the original level over the decay phase. At the stage where the magnetic energy density decreases, the thermal energy density increases; however, this increase is insufficient, by roughly an order of magnitude, to compensate for the magnetic energy decrease. When the magnetic energy release is over, the source parameters come back to nearly their original values. We discuss possible scenarios to explain this behavior.

Authors:
; ;  [1]
  1. Center For Solar-Terrestrial Research, New Jersey Institute of Technology, Newark, NJ 07102 (United States)
Publication Date:
OSTI Identifier:
22522013
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 802; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ACCELERATION; DIFFUSION; ENERGY DENSITY; MAGNETIC FIELDS; MICROWAVE RADIATION; PLASMA DENSITY; SOLAR FLARES; SUN; TURBULENCE

Citation Formats

Fleishman, Gregory D., Nita, Gelu M., and Gary, Dale E. ENERGY PARTITIONS AND EVOLUTION IN A PURELY THERMAL SOLAR FLARE. United States: N. p., 2015. Web. doi:10.1088/0004-637X/802/2/122.
Fleishman, Gregory D., Nita, Gelu M., & Gary, Dale E. ENERGY PARTITIONS AND EVOLUTION IN A PURELY THERMAL SOLAR FLARE. United States. doi:10.1088/0004-637X/802/2/122.
Fleishman, Gregory D., Nita, Gelu M., and Gary, Dale E. Wed . "ENERGY PARTITIONS AND EVOLUTION IN A PURELY THERMAL SOLAR FLARE". United States. doi:10.1088/0004-637X/802/2/122.
@article{osti_22522013,
title = {ENERGY PARTITIONS AND EVOLUTION IN A PURELY THERMAL SOLAR FLARE},
author = {Fleishman, Gregory D. and Nita, Gelu M. and Gary, Dale E.},
abstractNote = {This paper presents a solely thermal flare, which we detected in the microwave range from the thermal gyro- and free–free emission it produced. An advantage of analyzing thermal gyro emission is its unique ability to precisely yield the magnetic field in the radiating volume. When combined with observationally deduced plasma density and temperature, these magnetic field measurements offer a straightforward way of tracking evolution of the magnetic and thermal energies in the flare. For the event described here, the magnetic energy density in the radio-emitting volume declines over the flare rise phase, then stays roughly constant during the extended peak phase, but recovers to the original level over the decay phase. At the stage where the magnetic energy density decreases, the thermal energy density increases; however, this increase is insufficient, by roughly an order of magnitude, to compensate for the magnetic energy decrease. When the magnetic energy release is over, the source parameters come back to nearly their original values. We discuss possible scenarios to explain this behavior.},
doi = {10.1088/0004-637X/802/2/122},
journal = {Astrophysical Journal},
number = 2,
volume = 802,
place = {United States},
year = {Wed Apr 01 00:00:00 EDT 2015},
month = {Wed Apr 01 00:00:00 EDT 2015}
}