1. 1 Blaster Analysis Update Peng Cao, John Clem, Brian Daily, Daniel DeMarco, Katie Mulrey and David Seckel Anita Meeting 12/May/2014

2. 2 Blaster Definition: events with at least 15 channels or 9 phi sectors with a peak voltage in either polarization > 400 mV. Nadir Definition: Events where the peak voltage in the top ring is less than half of the peak voltage in the nadir ring. Blaster Event Example

3. ANITA 2 Events flagged as Blasters 3

4. The Hot Periods are removed from the analysis as they appear to correlated with ground sources 4

5. 5 PNG Screen shots ~50 different Blaster Events ftp://ftp.bartol.udel.edu/clem/anita/presentation/ GIF of all screen shots ftp://ftp.bartol.udel.edu/clem/anita/presentation/blastwf.gif

6. Blaster Events 6

7. 7

8. 8 Preliminary Polar version of the angular histogram shown in previous slide

9. 9

10. Histogram of Payload Spin Rate, Gray all GPS Data, Red Good Blaster Events Both histograms are scaled for viewing purposes 10

11. 11 Spin Rate (degrees/second) Correlation of Spin Rate versus Payload Orientation WRT the SUN Gray: all GPS Data, Red: Good Blaster Events

12. 12 Summary The correlation of Blaster events with Solar UV is not observable Blaster events are more frequent when the back of the ANITA instrument faces the sun and the payload spin rate is greater than 0.1 deg/sec or less than -0.1 deg/sec. Generally the horns in the vicinity of the ANITA instrument form the Blaster Events. Next step is to isolate angle-spin bands and look for possible different horn patterns in the events.