Characteristics of solar coronal source regions producing /sup 3/He-rich particle events

Technical Report · Thu Jan 01 00:00:00 EST 1987

OSTI ID:5269225

Kahler, S W; Lin, R P; Reames, D V; Stone, R G; Liggett, M

H/sub alpha/, x-ray, and kilometric radio data are used to examine the solar coronal activity associated with energetic about 1 MeV/inverse nuclear /sup 3/He-rich particle events observed near Earth. The basis of the study is the 12 He3-rich events observed in association with impulsive 2- to 100-keV electron events. When H/sub alpha/ and x-ray brightenings can be associated with /sup 3/He electron events, they have onsets coinciding to within 1 min of that of the associated metric type III bursts. In three or four events no associated H/sub alpha/ or x-ray flares, and in two events even the metric type III bursts were weak or absent. The measured low-energy (2 keV) electron spectra for these events show no evidence of a flattening due to Coulomb collisional losses. These results and several other recent findings are consistent with the idea that the /sup 3/He/electron events are due to particle acceleration in the corona well above the associated H/sub alpha/ and x-ray flares.

• Research Organization: Emmanuel Coll., Boston, MA (USA)
• OSTI ID: 5269225
• Report Number(s): AD-A-187792/7/XAB
• Resource Relation: Other Information: Pub. in Solar Physics, Vol. 107, 385-394(1987)
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
SOLAR ACTIVITY
HELIUM 3
SOLAR CORONA
SOLAR RADIO BURSTS
COLLISIONS
ELECTRON SPECTROSCOPY
LOSSES
SOLAR PARTICLES
ATMOSPHERES
ELECTROMAGNETIC RADIATION
EVEN-ODD NUCLEI
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
NUCLEI
RADIATIONS
RADIOWAVE RADIATION
SOLAR RADIATION
SPECTROSCOPY
STABLE ISOTOPES
STELLAR ATMOSPHERES
STELLAR CORONAE
STELLAR RADIATION
640104* - Astrophysics & Cosmology- Solar Phenomena