(SOHO) to Measure the Motion of a Coronal Mass Ejection

[deleted-322784]

For this project https://www.sciencebuddies.org/science- ... #procedure

what unit do we use for acceleration and velocity. and how would we convert it to those units?

[theborg]

ewjoey,

Thank you for your question and welcome to the forum. 1) velocity is the time rate of change in position and will be shown as distance per unit time. Since you can get distance in Kilometres and time in min then kilometres per minute (Km/min) is reasonable although it is a common practice to further convert time into seconds so you get Km/s. The time comes from the time hack in the images you will use for your research. The distance in Km is found using the ratio found in the procedures. 2) acceleration is the time rate of change of the velocity. So if velocity is Km/s and it changes by a certain amount in one second then it would be measured in kilometres per second per second, or Km/s^2. You find this by finding the velocity of the CME at two different points and the difference between divided by the difference in time between the two points yields the acceleration. If you get a negative number here that means what you are observing is slowing down.