1. RHESSI/NESSIE, June 2003 H.S. Hudson RHESSI observations of time variability - overview H. Hudson

2. RHESSI/NESSIE, June 2003 H.S. Hudson Basic points RHESSI rotates with half-period ~2 s and therefore will confuse space and time variations on shorter time scales The RHESSI counting rates are adequate for high time resolution, and each count is precisely time-tagged There are data gaps

3. RHESSI/NESSIE, June 2003 H.S. Hudson Arbitrary example of RHESSI time-series: 3-13 keV, G9 only 10-sec sample @ C2 level Goes low RHESSI 3-13 keV

4. RHESSI/NESSIE, June 2003 H.S. Hudson Nature of time series GOES Soft GOES Hard RHESSI F8 F3

5. RHESSI/NESSIE, June 2003 H.S. Hudson Interpretation The RHESSI time series contains much more information than the GOES time series RHESSI F3 (3-5.67 keV) is roughly equivalent to the GOES hard channel, based on time profile RHESSI time series have large unexpected variance

6. RHESSI/NESSIE, June 2003 H.S. Hudson Looking more closely at RHESSI half-rotations Counts/10 ms, G9

7. RHESSI/NESSIE, June 2003 H.S. Hudson Analysis software Arzner, K. “Time-domain demodulation of RHESSI light curves,” Solar Phys. 210, 87, 2003 Arzner, K., and Hurford, G. “Demodulation of RHESSI light curves by ‘local flatfielding’,” in preparation 2003