Calendar

Oct
20
Fri
Colloquium: Benjamin Oppenheimer (Host: Kristian Finlator)
Oct 20 @ 3:15 pm – 4:15 pm
Colloquium: Benjamin Oppenheimer (Host: Kristian Finlator) @ BX102

Colloquium Title

Benjamin Oppenheimer, University of Colorado Boulder

Abstract text

Oct
27
Fri
Colloquium: OPEN (Host: TBD)
Oct 27 @ 3:15 pm – 4:15 pm
Colloquium: OPEN (Host: TBD) @ BX102

Colloquium Title

Colloquium Speaker Name, Affiliation

Abstract text

Observatory Open House
Oct 27 @ 8:00 pm – 9:00 pm
Observatory Open House

Your hosts for the October Open House at the Campus Observatory are Kristian Finlator, Sten Hasselquist, Rachel Marra, and Aleczander Herczeg.

The Calendar of Astronomical Events for October 2017

October Night Sky Chart.

Nov
3
Fri
Colloquium: OPEN (Host: TBD)
Nov 3 @ 3:15 pm – 4:15 pm
Colloquium: OPEN (Host: TBD) @ BX102

Colloquium Title

Colloquium Speaker Name, Affiliation

Abstract text

Nov
9
Thu
Special Pizza Lunch: Jane Rigby
Nov 9 @ 1:00 pm – 2:00 pm
Nov
10
Fri
Colloquium: Jane Rigby (Host: Moire Prescott)
Nov 10 @ 3:15 pm – 4:15 pm
Colloquium: Jane Rigby (Host: Moire Prescott) @ BX102

Colloquium Title

Jane Rigby, NASA/GSFC

Abstract text

Nov
13
Mon
Pizza Lunch: James Lewis
Nov 13 @ 12:30 pm – 1:30 pm
Pizza Lunch: James Lewis @ AY 119

Multivariate Analysis of the CGM

Nov
15
Wed
Colloquium: Emma Dahl’s Thesis Proposal
Nov 15 @ 2:00 pm – 3:00 pm
Colloquium: Emma Dahl's Thesis Proposal @ BX102

Colloquium Title

Emma Dahl, NMSU

Abstract text

Nov
17
Fri
Colloquium: Larisza Krista (Host: James McAteer)
Nov 17 @ 3:15 pm – 4:15 pm

The statistical study of solar dimmings and their eruptive counterparts

Larisza Krista, Cu/CIRES, NOAA/NCEI

Picture1Results are presented from analyzing the physical and morphological properties of 154 dimmings (transient coronal holes) and the associated flares and coronal mass ejections (CMEs). Each dimming in the catalog was processed with the semi-automated Coronal Dimming Tracker (CoDiT) using Solar Dynamics Observatory AIA 193 Å observations and HMI magnetograms. Instead of the typically used difference images, the transient dark regions were detected “directly” in extreme ultraviolet (EUV) images. This allowed us to study dimmings as the footpoints of CMEs—in contrast with the larger, diffuse dimmings seen in difference images that represent the projected view of the rising, expanding plasma. Studying the footpoint-dimming morphology allowed us to better understand the CME structure in the low corona. While comparing the physical properties of dimmings, flares, and CMEs, the relationships between the different parts of this complex eruptive phenomenon were identified: larger dimmings were found to be longer-lived, which suggests that it takes longer to “close down” large open magnetic regions. During their growth phase, smaller dimmings were found to acquire a higher magnetic flux imbalance (i. e., become more unipolar) than larger dimmings. Furthermore, the EUV intensity of dimmings (indicative of local electron density) was found to correlate with how much plasma was removed and how energetic the eruption was. Studying the morphology of dimmings (single, double, fragmented) also helped identify different configurations of the quasi-open magnetic field.

BIO

Dr Larisza Krista received an MSc degree in astrophysics in 2007 from Eotvos Lorand University, in Budapest, Hungary. She did her PhD at Trinity College Dublin (Ireland) as a Government of Ireland Scholar, on “The Evolution and Space Weather Effects of Solar Coronal Holes”. She moved to Boulder in 2011 to accept a research scientist position at CU/CIRES in residence at NOAA/SWPC. She has also been a long-term scientific visitor at the High Altitude Observatory, where she collaborates with Dr Scott McIntosh. Her main interests involve the evolution of open solar magnetic field regions over the solar cycle as well as the related heliospheric structures and geomagnetic effects.

 

 

Observatory Open House
Nov 17 @ 7:00 pm – 8:00 pm
Observatory Open House

Your hosts for the November Campus Observatory Open House are Chris Churchill, Sean Sellers, Sam Schonfeld, and Sarah Kovac.

 

The Calendar of Astronomical Events for November 2017

November Night Sky Chart.