Theoretical implications of the derivativity' effect in solar flares
Conference
·
· American Astronomical Society, Bulletin; (United States)
OSTI ID:6645904
- Univ. of California, Berkeley (United States)
We discuss recent observational results which substantiate the derivativity' effect in solar flares, namely the face that the time profiles of impulsive emissions such as hard X-rays and microwaves reflect not so much the time profile of the soft X-ray emission, but rather its time derivative. We have performed numerical simulations of the atmospheric response to flare heating both by nonthermal electrons and by thermal conduction from a superhot coronal region. We find that the predictions of the electron heated model are in excellent agreement with the derivativity' observations and that both temperature and density enhancements play a significant role in determining the relationship between the hard X-ray and soft X-ray emissions. On the other hand, the conductively-heated model predicts no clear correlations between the hard and soft X-ray emissions, and certainly not a derivativity' relationship. We conclude that these observations point strongly toward a prominent role for nonthermal electron heating in solar flares.
- OSTI ID:
- 6645904
- Report Number(s):
- CONF-930189--
- Conference Information:
- Journal Name: American Astronomical Society, Bulletin; (United States) Journal Volume: 24:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
661320* -- Auroral
Ionospheric
& Magnetospheric Phenomena-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ATMOSPHERES
COMPUTERIZED SIMULATION
CORRELATIONS
DATA
ELECTROMAGNETIC RADIATION
ELECTRONS
ELEMENTARY PARTICLES
EMISSION
ENERGY TRANSFER
EXPERIMENTAL DATA
FERMIONS
HARD X RADIATION
HEAT TRANSFER
INFORMATION
IONIZING RADIATIONS
LEPTONS
MICROWAVE RADIATION
NUMERICAL DATA
RADIATIONS
SIMULATION
SOFT X RADIATION
SOLAR ACTIVITY
SOLAR ATMOSPHERE
SOLAR CORONA
SOLAR FLARES
STELLAR ATMOSPHERES
STELLAR CORONAE
THEORETICAL DATA
THERMAL CONDUCTION
X RADIATION
Ionospheric
& Magnetospheric Phenomena-- (1992-)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
99 GENERAL AND MISCELLANEOUS
990200 -- Mathematics & Computers
ATMOSPHERES
COMPUTERIZED SIMULATION
CORRELATIONS
DATA
ELECTROMAGNETIC RADIATION
ELECTRONS
ELEMENTARY PARTICLES
EMISSION
ENERGY TRANSFER
EXPERIMENTAL DATA
FERMIONS
HARD X RADIATION
HEAT TRANSFER
INFORMATION
IONIZING RADIATIONS
LEPTONS
MICROWAVE RADIATION
NUMERICAL DATA
RADIATIONS
SIMULATION
SOFT X RADIATION
SOLAR ACTIVITY
SOLAR ATMOSPHERE
SOLAR CORONA
SOLAR FLARES
STELLAR ATMOSPHERES
STELLAR CORONAE
THEORETICAL DATA
THERMAL CONDUCTION
X RADIATION