Calendar

Sep
14
Thu
ASTR 565 – Stellar Interiors
Sep 14 @ 11:45 am – 1:00 pm
Galaxy Group
Sep 14 @ 2:30 pm – 3:00 pm
Inclusive Astronomy
Sep 14 @ 3:00 pm – 4:00 pm
Sep
15
Fri
ASTR 535 – Observational Techniques I
Sep 15 @ 9:30 am – 10:20 am
PDS Atmospheres Node meeting
Sep 15 @ 10:30 am – 11:30 am
Colloquium: Lisa Winter (Host: Laura Boucheron)
Sep 15 @ 3:15 pm – 4:15 pm
Colloquium: Lisa Winter (Host: Laura Boucheron) @ BX102

Long duration solar gamma ray flares

Lisa Winter, LANL

Long duration solar gamma ray flares (LDGRFs) present a challenge to models of solar flares. While the gamma ray emission initially was thought to be the high energy extension of emission produced at the footprints of flare loops, LDGRFs are more energetic than expectations and last hours after the X-ray emission subsides. Evidence of gamma ray emission from flares on the backside of the Sun prompted the idea that LDGRFs instead are created from acceleration of particles in the shock waves of coronal mass ejections (CMEs). To determine which of these scenarios is more likely, we conducted a study of the flare and CME properties for LDGRFs detected by the Fermi Gamma-Ray Observatory. We also performed a reverse association analysis to determine which flares and CMEs do not produce gamma-ray emission. In this talk, these results are presented, showing that LDGRFs are most likely associated with CME acceleration.

Sep
18
Mon
ASTR 535 – Observational Techniques I
Sep 18 @ 9:30 am – 10:20 am
ASTR 670 – Heliophysics
Sep 18 @ 11:00 am – 12:15 pm
Sep
19
Tue
ASTR 565 – Stellar Interiors
Sep 19 @ 11:45 am – 1:00 pm
Astro-ph Discussion
Sep 19 @ 2:30 pm – 3:00 pm
Astro-ph Discussion @ AY119