Evidence of increasing acoustic emissivity at high frequency with solar cycle 23 in Sun-as-a-star observations

Details Evidence of increasing acoustic emissivity at high frequency with solar cycle 23 in Sun-as-a-star observations Evidence of increasing acoustic emissivity at high frequency with solar cycle 23 in Sun-as-a-star observations

2009-07-25

arxiv.org/abs/0907.4441v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

Proceedings of the Stellar Pulsation. Santa Fe, USA. 3 pages, 5 figures

Scientific paper

We used long high-quality unresolved (Sun-as-a-star observations) data collected by GOLF and VIRGO instruments on board the ESA/NASA SOHO satellite to investigate the amplitude variation with solar cycle 23 in the high-frequency band (5.7 < nu< 6.3 mHz). We found an enhancement of acoustic emissivity over the ascending phase of about 18+-3 in velocity observations and a slight enhancement of 3+-2 in intensity. Mode conversion from fast acoustic to fast magneto-acoustic waves could explain the enhancement in velocity observations. These findings open up the possibility to apply the same technique to stellar intensity data, in order to investigate stellar-magnetic activity.

Affiliated with

Also associated with

No associations

Rating

Evidence of increasing acoustic emissivity at high frequency with solar cycle 23 in Sun-as-a-star observations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Evidence of increasing acoustic emissivity at high frequency with solar cycle 23 in Sun-as-a-star observations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evidence of increasing acoustic emissivity at high frequency with solar cycle 23 in Sun-as-a-star observations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-357004